| chemical communication in cavia: responses of wild (c. aperea), domestic (c. porcellus) and f1 males to urine. | urine preferences of wild (cavia aperea), domestic (c. porcellus), and f1 adult male guinea pigs were investigated. males of all three types preferred female urine to male urine regardless of donor type. when given a choice between female urine of each type, males preferred conspecific urine. in choices between male urine of the three types, a conspecific preference was evident for wild and domestic but not f1 subjects. these data indicate that a loss of distinctive male and female odours had no ... | 1979 | 555840 |
| parasitological and ecological aspects of schistosomiasis mansoni in the valley of the paraíba do sul river (são paulo state, brazil) i. natural infection of small mammals with schistosoma mansoni. | small mammals naturally infected with schistosoma mansoni were studied in the valley of the paraíba do sul river (são paulo state, brazil). 192 animals of 12 species were examined post mortem. cavia aperea, holochilus brasiliensis leucogaster, nectomys squamipes squamipes, oryzomys nigripes eliurus and zygodontomys brachyurus were found infected. most schistosome eggs found in the faeces were mature but no eggs were found in the faeces of c. aperea although adults were recovered. in the other in ... | 1978 | 725994 |
| [dental growth (eruption) and attrition in rodents studied especially in the preá--cavia aperea aperea--erxleben--1977 (rodentia)]. | | 1976 | 1076735 |
| reactivity of gut segments of cavia aperea aperea (erxleben 1777) | | 1975 | 1235461 |
| ramification of the a. mesenterica cranialis and its variability in the guinea pig (cavia aperea f. porcellus). | the authors studied ramification of the a. mesenterica cranialis and its variability in 30 guinea pigs (cavia aperea f. porcellus) after injecting red-dyed latex into their arterial bed. in every case, this artery arose from the truncus hepato-mesentericus, which in turn was a branch of a thick arterial truncus coeliaco-mesentericus. after leaving its site of origin, the a. mesenterica cranialis formed a long arc whose convexity was directed leftwards and caudally. its first branch was most freq ... | 1991 | 1790339 |
| variability of the v. cava caudalis and its tributaries in some laboratory animals. i. the guinea pig (cavia aperea f. porcellus). | the authors studied variability of the v. caudalis and its tributaries in 30 guinea pigs (cavia aperea f. porcellus--15 males and 15 females) after injecting the relevant venous system with blue-dyed latex. since the largest lobe of the guinea pig's liver (the lobus sinister) is situated on the left, the right kidney lies further cranially than the left one. in males, as a rule, the right v. renalis opens into the v. cava caudalis further cranially than the left one. the number of vv. renales sh ... | 1991 | 1802046 |
| variability of branching of the a. coeliaca (truncus coeliacomesentericus) in the guinea pig (cavia aperea f. porcellus). | the authors studied branching of the a. coeliaca (the truncus coeliacomesentericus) in a group of peruvian short-haired guinea pigs, with special reference to its variability. after the animals had been anaesthetized, their arterial bed was injected with red-dyed latex, fixed and dissected. in all 30 guinea pigs (100%), blood was supplied to the unpaired organs of the abdominal cavity by a truncus coeliacomesentericus arising from the aorta abdominalis at fundus ventriculi level. in 53.3% of the ... | 1990 | 2083883 |
| origin of the v. portae and variability of its tributaries in laboratory animals. ii. the guinea pig (cavia aperea f. porcellus). | the authors investigated the origin of the v. portae and variability of its main tributaries in 30 adult guinea pigs (cavia aperea f. porcellus). the venous bed was visualized by means of blue-dyed latex. the v. portae was formed the most frequently - in 17 cases (56.7%) - by the confluence of three veins - the v. mesenterica cranialis, the v. lienalis and the v. gastroepiploica dextra; less often it was formed from four or five tributaries and in one case only it was formed by union of the v. m ... | 1990 | 2269458 |
| [clarification of basic factors of the morphology of the skull, especially ontogenesis of the skull of cavia aperea f. porcellus l]. | skull morphology cannot be understood without consideration of its ontogenetic morphogenesis. meaningful comparisons of vertebrate crania must include these developmental processes. the criteria and methods for descriptions and comparisons were originally established by ernst gaupp and others around the beginning of this century. nevertheless, the complete course of cranial morphogenesis from the first precartilaginous blastemata to the adult cranium has never been described in any vertebrate sp ... | 1986 | 3792800 |
| [the lateral geniculate body of the guinea pig (cavia aperea f. domestica). its organization with reference to retinal afferents]. | the lateral geniculate nucleus (lgn) of the guinea pig was studied in order to investigate the existence of an alpha- and beta-sector. on the basis of the fibre arrangement and the cell distribution in its rostral third the lgd can be subdivided into an alpha- and beta-sector. the caudal half of the lgd comprises the alpha-sector only. in contrast to the alpha-sector, in which the cells are densely packed, the beta-sector is rich in fibre bundles and contains a scattering of medium-sized cells. ... | 1985 | 3989279 |
| structure of the anterior nucleus in the hypothalamus of the guinea-pig (cavia aperea f. porcellus l.). | | 1970 | 4194323 |
| [cytologic data of oestrous cycle of cavia aperea aperea (rodentia)--erxleben 1777]. | | 1973 | 4535772 |
| [dental growth and metabolism of calcium and total and inorganic phosphorus of preás (cavia aperea aperea--1777 rodentia)]. | | 1974 | 4535913 |
| [hematologic data of cavia aperea aperea (rodentia) erxleben 1777]. | | 1974 | 4535914 |
| [reproduction of preás (cavia aperea aperea-rodentia) in vivarium. influence of alimentation and analysis of the weight curves]. | | 1974 | 4535923 |
| carbonic anhydrase isozymes in cavia porcellus, cavia aperea and their hybrids. | | 1972 | 4629950 |
| [studies on wild reservoirs and vectors of trypanosoma cruzi. xiv. natural infection of a rodent, cavia aperea aperea erxleben, 1777 by trypanosoma like trypanosoma cruzi]. | | 1966 | 4970119 |
| [contribution to the study of morphologic aspects of the molars of "cavia aperea aperea"]. | | 1969 | 5254991 |
| [dental growth and metabolism of total and inorganic calcium and phosphorus in guinea pigs (cavia aperea aperea)-erxleben-1-777 (rodentia)]. | | 1971 | 5288137 |
| experimental analysis of projections of cingulum fibres in guinea pigs (cavia aperea f. porcellus l.). i. microtopography of the fibres after lesions in the occipital part of the cingulum. | | 1970 | 5433958 |
| [on fibrillar structures in the adrenal medulla of domesticated and wild guinea pigs (cavia aperea f. porcellus l. and cavia aperea tschudii fitzinger)]. | | 1968 | 5707308 |
| immunological relationships of an endogenous guinea pig retrovirus with prototype mammalian type b and type d retroviruses. | a retrovirus endogenous to guinea pig cells was earlier shown to be morphologically similar to type b and type d prototype retroviruses. molecular hybridization techniques were used to show that guinea pig virus nucleotide sequences are endogenous to both domestic (cavia porcellus) and indigenous (cavia aperea) guinea pigs, but cannot be detected in the dna of either other hystricomorph rodents or other mammals tested. using radioimmunological techniques designed to detect interspecies relations ... | 1980 | 6154150 |
| [effect of the antiandrogen cyproterone acetate on the behavior and mature testis of the male guinea pig (cavia aperea procellus, linné, 1758)]. | | 1984 | 6237508 |
| perineal scent gland of wild and domestic cavies: bacterial activity and urine as sources of biologically significant odors. | several studies were conducted to evaluate the source of biologically relevant odorous substances in male wild cavy (cavia aperea ) perineal gland secretions. in the first study, using a habituation procedure, male wild cavies distinguished between the urine of two individuals after exposure to the perineal secretions of one of the individuals. however, these animals did not distinguish between the perineal secretions of two individuals after exposure to the urine of one of the individuals. thes ... | 1984 | 6718552 |
| anatomy of the guinea-pig cecum. | the anatomy of the cecum of the domesticated guinea pig (cavia aperea f. procellus) was investigated at the macroscopic and microscopic levels. in situ observations, injections of the blood vascular system and the preparation of dried specimens were made to elucidate the macroscopic anatomy of the cecum. the complex mesenterial situation in the abdomen was also investigated. the guinea-pig intestinal tract is peculiarized by the presence of the voluminous teniated cecum, which lacks an appendix ... | 1982 | 7149278 |
| [taxorchis caviae sp. n. (trematoda, paramphistomidae), intestinal parasite of cavia aperea aperea erxleben, 1777 (rodentia, caviidae)]. | | 1981 | 7348765 |
| suitability of different staining methods for the identification of isolated and cultured cells from guinea pig (cavia aperea porcellus) stomach. | cell suspensions from the guinea pig gastric mucosa were obtained using a pronase/collagenase isolation method, and cultured on petri dishes in minimum essential medium at 37 degrees c. for proper identification of different gastric cell types in cytospots, cell suspensions or culture, selective staining methods were employed, modified and evaluated. mucous cells and mucous neck cells were detected by use of lectins. mucous cells were stained on cytospots and in primary cultures with lectins fro ... | 1995 | 8835136 |
| of domestic and wild guinea pigs: studies in sociophysiology, domestication, and social evolution. | among mammals a majority of each individual's daily expectations, motivations, and behaviors are directed to encounters with conspecifics. therefore the knowledge of the genesis, control, and consequences of social interactions is crucial for understanding their social life. we present here our research on the sociophysiology, domestication, and social evolution of wild (cavia aperea and galea musteloides) and domestic (cavia aperea f. porcellus) guinea pigs, which summarizes general rules for m ... | 1998 | 9722963 |
| venous drainage of the stomach in the golden hamster (mesocricetus auratus) and the guinea pig (cavia aperea f. porcellus). | venous drainage patterns of the stomach were studied in 30 golden hamsters (mesocricetus auratus) and in 30 guinea pigs (cavia aperea f. porcellus). in golden hamsters the most frequent group had a v. gastroepiploica dextra (85.6% of cases). the v. gastroepiploica sinistra was found in 63.3% of cases. in the second group, the venous drainage pattern was without a v. gastroepiploica dextra (13.3% of cases). the only constant venous channel from the stomach was the v. gastrica sinistra. other vein ... | 1998 | 9862037 |
| the behavioral endocrinology of domestication: a comparison between the domestic guinea pig (cavia aperea f. porcellus) and its wild ancestor, the cavy (cavia aperea). | in this study spontaneous behavior and endocrine parameters were compared between the domestic guinea pig (cavia aperea f. porcellus) and its wild ancestor, the cavy (cavia aperea), to elucidate the process of domestication in this species. in 120 h of observation time the behavior of five groups of wild and seven groups of domestic guinea pigs, each consisting of one adult male and two adult females, was analyzed quantitatively. to assess the activities of the pituitary-adrenocortical (pac), th ... | 1999 | 10049600 |
| maturation of epididymal spermatozoa in the nondomesticated guinea pigs cavia aperea and galea musteloides. | the physiological changes occurring in spermatozoa in the male reproductive tract of 2 nondomesticated species of south american guinea pigs with different mating systems were studied. cavia aperea, the wild ancestor of the domesticated guinea pig, has a polygynous mating system, whereas galea musteloides exhibits promiscuous mating behavior. the epididymis of both species resembled that of the domesticated guinea pig, with a swathe of tubule convolutions (linking the 2 major parts of the organ) ... | 2000 | 10670529 |
| different types of oestrous cycle in two closely related south american rodents (cavia aperea and galea musteloides) with different social and mating systems. | a comparative approach was used to investigate two closely related south american rodent species: the wild cavy (cavia aperea) and the yellow-toothed cavy (galea musteloides). these species of wild guinea-pig inhabit different habitats and show divergent social and mating systems. cavia have a polygynous mating system, whereas in galea promiscuous mating occurs. these observations correspond to functional variations in sperm characteristics, which might be interpreted as adaptations to different ... | 2001 | 11427168 |
| arthropod and helminth parasites of the wild guinea pig, cavia aperea, from the andes and the cordillera in peru, south america. | as part of an ongoing research project concerning the diversity and distribution of parasites of caviidae in south america, 143 wild guinea pigs (cavia aperea) were collected from 3 localities in the andean highlands of peru. samples were collected between november 1996 and may 1999 and included representatives of arthropods, nematodes, and trematodes. seven species of arthropods: leptopsylla segnis (27.3%), tiamastus cavicola (6.9%), gliricola porcelli (55.2%), hoplopleura alata (6.9%), polypla ... | 2002 | 12054024 |
| [palaeoparasitological analysis of guinea pig mummies of the chiribaya culture, moquegua valley, peru]. | during several excavations of archeological sites in the moquegua valley, southern peru, various guinea pig mummies (cavia aperea f. porcellus) have been discovered. they belong to the chiribaya culture (900-1100 ad). the outstanding preservation of the mummified animals gave rise to the idea of a paleoparasitological analysis. in the fur, numerous well preserved ectoparasites (lice, fleas, mites) could be recovered. generally, ectoparasite remains are rarely found among archeological material. ... | 2003 | 12592929 |
| is a wild mammal kept and reared in captivity still a wild animal? | this study compared domestic guinea pigs (cavia aperea f. porcellus; dgp) and two different populations of the wild cavy (cavia aperea), its ancestor, to examine whether rearing of wild mammals in captivity affects their behavior and physiological stress responses. one population of wild cavies consisted of wild-trapped animals and their first laboratory-reared offspring (wgp-1). the animals of the other population were reared in captivity for about 30 generations (wgp-30). the spontaneous behav ... | 2003 | 12614649 |
| [occurrence and distribution of ectoparasites in guinea pigs (cavia spp.) in peru, south america]. | studies on the prevalence and distribution of ectoparasites in peru were carried out during a period of 2 1/2 years. the survey included 17,421 domesticated guinea pigs (cavia aperea f. porcellus) from 14 departments in all bioregions and altitude levels and 143 wild guinea pigs (cavia aperea) from three areas (el paramo, junin and la raya) in the andes and the cordillera. the guinea pig is an important source of food, especially for the rural population, the infestation with ectoparasites, such ... | 2003 | 12680275 |
| techniques of dna-studies on prehispanic ectoparasites (pulex sp., pulicidae, siphonaptera) from animal mummies of the chiribaya culture, southern peru. | during a paleoparasitological survey of several animal mummies (cavia aperea f. porcellus and canis familiaris) from chiribaya baja, an archaeological site in southern peru, an unexpected find was made. in the well preserved fur, large numbers of mummified fleas (pulex simulans/irritans) that parasitized the animals during life were encountered. due to the relative recent event of the host mummification and the outstanding preservation of the fleas, an attempt for the retrieval of dna was made. ... | 2003 | 12687763 |
| [epidemiology of manson's schistosomiasis and natural infection of cavia aperea aperea]. | | 1964 | 14242008 |
| [morphological study of spontaneous schistosomiasis of guinea pigs (cavia aperea aperea)]. | | 1964 | 14260738 |
| [progeny of an interspecies cross of guinea pigs: cavia aperea d'az and cavia cobaya marcg. investigation during a 25 year period]. | | 1951 | 14897147 |
| a striated muscle on the hard palate of rodents and rabbits. | summary a striated muscle of the hard palate has been previously described in some rodents and rabbits. it is not termed in the official veterinary anatomical nomenclature. the aim of this work was to verify the existence of this muscle. heads of the golden hamster (mesocricetus auratus), the guinea pig (cavia aperea f. porcellus), the laboratory rat (rattus norvegicus var. alba), the field vole (microtus agrestis) and the domestic rabbit (oryctolagus cuniculus f. domesticus) have been dissected ... | 2004 | 15027950 |
| the cost of a specific immune response in young guinea pigs. | the specific immune system is a protective mechanism that detects infection and fights it by production of antibodies. newborns are especially susceptible to infections because their immune system is not yet as fully developed as that of adults. this has been well established in altricial mammals. fighting infection is associated with costs (metabolic rate, protein synthesis) potentially affecting other developmental processes. we investigated the specific immune response in a precocial mammal, ... | 2005 | 15885720 |
| social organization predicts nature of infant-adult interactions in two species of wild guinea pigs (cavia aperea and galea monasteriensis). | the authors compared interactions of infants with mothers and unfamiliar females in a novel environment in 2 caviomorph rodent species: the harem-living cavia aperea, the probable progenitor of the domestic guinea pig; and the pair-living galea monasteriensis. in c. aperea, interactions with mothers and unfamiliar females were largely similar; in g. monasteriensis, interactions with the mother, but not unfamiliar female, were characterized by physical closeness and sociopositive behavior. in g. ... | 2006 | 16551160 |
| molecular detection of paracoccidioides brasiliensis in road-killed wild animals. | paracoccidioides brasiliensis infections have been little studied in wild and/or domestic animals, which may represent an important indicator of the presence of the pathogen in nature. road-killed wild animals have been used for surveillance of vectors of zoonotic pathogens and may offer new opportunities for eco-epidemiological studies of paracoccidiodomycosis (pcm). the presence of p. brasiliensis infection was evaluated by nested-pcr in tissue samples collected from 19 road-killed animals; 3 ... | 2008 | 17885959 |
| the effects of early environmental conditions on the reproductive and somatic development of juvenile guinea pigs (cavia aperea f. porcellus). | little is known about the effects of the early environment on the development of non-seasonally reproducing species like the domestic guinea pig (cavia aperea f. porcellus). although guinea pigs reproduce throughout the year, there is evidence for environmental sensitivity of their reproductive physiology. to investigate the sensitivity of juvenile body weight and puberty to differences in the prenatal and early postnatal environment, subjects were exposed to either of two experimental condition ... | 2008 | 17977535 |
| postnatal lung and metabolic development in two marsupial and four eutherian species. | two marsupial species (monodelphis domestica, macropus eugenii) and four eutherian species (mesocricetus auratus, suncus murinus, tupaia belangeri and cavia aperea) were examined to compare and contrast the timing of lung and metabolic development during the postnatal maturation of the mammalian respiratory apparatus. using light, scanning and transmission electron microscopy, the lung structural changes were correlated with indirect calorimetry to track the metabolic development. marsupial and ... | 2008 | 18179474 |
| habitat associations of small mammals in southern brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna. | we inventoried terrestrial small mammals in an agricultural area in southern brazil by using trapping and prey consumed by barn owls (tyto alba) and white-tailed kites (elanus leucurus). small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. a total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of barn owls, and 2,066 from the diet of white-tailed kites. both trapping and prey in the p ... | 2007 | 18278312 |
| non-invasive measurement of adrenocortical and gonadal activity in male and female guinea pigs (cavia aperea f. porcellus). | taking blood samples is a common method in biomedical and biological research using guinea pigs. however, most blood sampling techniques are complicated and highly invasive and may therefore not be appropriate for certain research topics concerning stress and reproduction. thus, a non-invasive method to measure steroid hormones is critically needed. the aim of this study was the biological validation of corresponding enzyme immunoassays for the measurement of fecal cortisol, progesterone, estrog ... | 2008 | 18430425 |
| vocal mother-offspring communication in guinea pigs: females adjust maternal responsiveness to litter size. | abstract: | 2008 | 18783602 |
| puberty in female cavies (cavia aperea) is affected by photoperiod and social conditions. | in many environments, photoperiod is a reliable predictor of ecological conditions. such predictability generally declines towards low latitudes as the yearly cycle becomes less marked. it has been claimed that photoperiodic effects are small in cavies and guinea pigs that reproduce throughout the year. we here investigated photoperiodic influences on the onset of puberty in female cavies (cavia aperea) and show that photoperiod exerts a major influence. female pups kept in groups of two matured ... | 2009 | 19087883 |
| effects of nutritional quality during early development on body weight and reproductive maturation of guinea pigs (cavia aperea f. porcellus). | in many species, somatic and reproductive maturation are sensitive to seasonally-fluctuating environmental conditions such as food quality. the protein content of the diet during early development has been considered to be particularly important, a low-protein diet during gestation and lactation typically delaying growth and reproductive onset. to investigate the effects of maternal and early postnatal diet quality on body weight and puberty of male and female domestic guinea pigs, we fed f0-mot ... | 2009 | 19523374 |
| mother is not like mother: concurrent pregnancy reduces lactating guinea pigs' responsiveness to pup calls. | offspring signalling can serve to communicate need to the parents and thus influence parental readiness to provide care. offspring stimuli that affect parental care have been investigated extensively. yet much less is known about the mechanisms leading to a decline in maternal motivation when conflicts of provisioning current and future offspring may arise. here we tested responses by pregnant and non-pregnant female guinea pigs (cavia aperea f. porcellus) to playback of pup calls during their p ... | 2010 | 19879338 |
| gastrointestinal parasites of cavy (cavia aperea aperea) in southern brazil. | the aim of this study was to evaluate the gastrointestinal parasitism in cavia aperea aperea (cavy), captured in the central region of rio grande do sul state. fecal samples from five free-living cavies were collected for research of parasites. samples were analyzed by the centrifugal-flotation method with zinc sulfate and parasites were identified microscopically based on (oo)cyst and egg size and morphology. cysts of giardia sp. and (oo)cysts of cryptosporidium sp. and cystoisospora sp. were o ... | 2010 | 20227736 |
| [not available]. | | 1946 | 20245972 |
| wild genius - domestic fool? spatial learning abilities of wild and domestic guinea pigs. | abstract: | 2010 | 20334697 |
| search for mycobacterium leprae in wild mammals. | leprosy is still a worldwide public health problem. brazil and india show the highest prevalence rates of the disease. natural infection of armadillos dasypus novemcinctus with mycobacterium leprae has been reported in some regions of the united states. identification of bacilli is difficult, particularly due to its inability to grow in vitro. the use of molecular tools represents a fast and sensitive alternative method for diagnosis of mycobacteriosis. in the present study, the diagnostic metho ... | 2010 | 20428654 |
| ambient temperature and pregnancy influence cortisol levels in female guinea pigs and entail long-term effects on the stress response of their offspring. | mammals generally respond to the important metabolic requirements imposed by thermoregulation and pregnancy by increasing plasma concentrations of glucocorticoid that promote the mobilization of body reserves and enhance energy use by tissues. this study examined the impact of distinct ambient temperatures and reproductive status on cortisol plasma levels in female guinea pigs (cavia aperea f. porcellus). we also examined cortisol profiles of their offspring. forty adult females were placed in i ... | 2011 | 21334340 |
| seasonal dynamics and hosts of amblyomma triste (acari: ixodidae) in argentina. | the seasonal dynamics and host usage of amblyomma triste in argentina were analyzed. adults of a. triste were present from early winter to mid-summer, with the peak of abundance from late winter to mid-spring (august to october). larvae and nymphs were found from december to june, with the peak of abundance in summer. there were no differences among the biological parameters (pre-moult period of larvae and nymphs, pre-oviposition period of females, and minimum incubation period of eggs) of engor ... | 2011 | 21536384 |
| chronic stress in pregnant guinea pigs (cavia aperea f. porcellus) attenuates long-term stress hormone levels and body weight gain, but not reproductive output. | stress, when extreme or chronic, can have a negative impact on health and survival of mammals. this is especially true for females during reproduction when self-maintenance and investment in offspring simultaneously challenge energy turnover. therefore, we investigated the effects of repeated stress during early- and mid-gestation on the maternal stress axis, body weight gain and reproductive output. female guinea pigs (cavia aperea f. porcellus, n = 14) were either stressed (treatment: exposure ... | 2011 | 21647601 |
| effects of prenatal stress on hypothalamic-pituitary-adrenal (hpa) axis function over two generations of guinea pigs (cavia aperea f. porcellus). | prenatal stress can alter hypothalamic-pituitary-adrenal axis function with potential consequences for later life. the aim of our study was to examine in guinea pigs (cavia aperea f. porcellus) the effects of stress experienced during f0 pregnancy on glucocorticoid levels in plasma and feces, as well as challenge performance, in f1 offspring (n=44) and fecal glucocorticoid levels in f2 offspring (n=67). f1 animals were either born to f0 dams that had been stressed with strobe light during early ... | 2011 | 22202601 |
| effects of chronic stress during pregnancy on maternal performance in the guinea pig (cavia aperea f. porcellus). | stress experienced during pregnancy can have persistent impact on the female's physiology and behaviour not only during but even beyond pregnancy. the present study aimed to evaluate such long-term effects of stress in terms of repeated strobe light exposure during early to mid gestation on behavioural aspects of mothering activities and lactational effort in lactating guinea pigs. we found that maternal behaviour was negatively affected by stress experience during pregnancy with treatment femal ... | 2012 | 23287615 |
| draft genome of the leptospira interrogans strains, acegua, rca, prea, and capivara, obtained from wildlife maintenance hosts and infected domestic animals. | in the present paper, we announce new draft genomes of four leptospira interrogans strains named acegua, rca, prea, and capivara. these strains were isolated in the state of rio grande do sul, brazil, from cattle, dog, brazilian guinea pig, and capybara, respectively. | 2016 | 27074260 |
| a comparison of brain gene expression levels in domesticated and wild animals. | domestication has led to similar changes in morphology and behavior in several animal species, raising the question whether similarities between different domestication events also exist at the molecular level. we used mrna sequencing to analyze genome-wide gene expression patterns in brain frontal cortex in three pairs of domesticated and wild species (dogs and wolves, pigs and wild boars, and domesticated and wild rabbits). we compared the expression differences with those between domesticated ... | 2012 | 23028369 |
| the maternal social environment shapes offspring growth, physiology, and behavioural phenotype in guinea pigs. | prenatal conditions influence offspring development in many species. in mammals, the effects of social density have traditionally been considered a detrimental form of maternal stress. now their potential adaptive significance is receiving greater attention.sex-specific effects of maternal social instability on offspring in guinea pigs (cavia aperea f. porcellus) have been interpreted as adaptations to high social densities, while the effects of low social density are unknown. hence, we compared ... | 2015 | 26816513 |
| molecular detection of leishmania spp. in road-killed wild mammals in the central western area of the state of são paulo, brazil. | road-killed wild animals have been classified as sentinels for detecting such zoonotic pathogens as leishmania spp., offering new opportunities for epidemiological studies of this infection. | 2014 | 24963288 |
| molecular characterization of virulent leptospira interrogans serogroup icterohaemorrhagiae isolated from cavia aperea. | leptospirosis is a worldwide zoonotic infection caused by pathogenic leptospira. synanthropic rodents are recognized carriers of leptospires; however, the role of wild rodents in the epidemiology of the disease is still incipient. in this work, we describe leptospira strain isolated from cavia aperea (brazilian guinea pig). the isolated strain was characterized by partial rpob gene sequencing, variable-number tandem-repeats and histopathological analysis. the strain was identified as leptospira ... | 2013 | 23435256 |
| stability of the guinea pigs personality - cognition - linkage over time. | in human psychological research, personality traits as well as cognitive traits are usually validated for both, their stability over time and contexts. while stability over time gives an estimate on how genetically fixated a trait can be, correlations across traits have the power to reveal linkages or trade - offs. in animals, these validations have widely been done for personality but not for cognitive traits. we tested guinea pigs in four consecutive discrimination tasks using four unique pair ... | 2017 | 27363384 |
| blastocyst recovery and multifactorial gene expression analysis in the wild guinea pig (cavia aperea). | the expression of specific developmentally important genes in preimplantation embryos is an accepted marker for unraveling the influence of single factors in studies that are mostly related to artificial reproduction techniques. such studies, however, often reveal high levels of heterogeneity between single embryos, independently of the influence of factors of interest. a possible explanation for this variation could be the large variety of physiological and environmental factors to which early ... | 2016 | 27264741 |
| instituting dark-colored cover to improve central space use within guinea pig enclosure. | domestic guinea pigs (cavia aperea f. porcellus) in laboratories have been shown to actively avoid the centers of their cages. this experiment tested a novel, dark-colored "shader" placed over the central portion of a cage. based on the observed behavior of wild guinea pig species, it was hypothesized that utilization of the central portion of the cage would increase when the shader was present. eleven male and 11 female albino, 3-week-old hartley guinea pigs (crl:ha) experienced the control and ... | 2016 | 27223319 |
| paternal heat exposure causes dna methylation and gene expression changes of stat3 in wild guinea pig sons. | epigenetic mechanisms convey environmental information through generations and can regulate gene expression. epigenetic studies in wild mammals are rare, but enable understanding adaptation processes as they may occur in nature. in most wild mammal species, males are the dispersing sex and thus often have to cope with differing habitats and thermal changes more rapidly than the often philopatric females. as temperature is a major environmental selection factor, we investigated whether geneticall ... | 2016 | 27066228 |
| paternal intergenerational epigenetic response to heat exposure in male wild guinea pigs. | epigenetic modifications, of which dna methylation is the best studied one, can convey environmental information through generations via parental germ lines. past studies have focused on the maternal transmission of epigenetic information to the offspring of isogenic mice and rats in response to external changes, whereas heterogeneous wild mammals as well as paternal epigenetic effects have been widely neglected. in most wild mammal species, males are the dispersing sex and have to cope with dif ... | 2016 | 26686986 |
| the complete mitochondrial genome of the cavia aperea. | cavia aperea which is a brazilian guinea pig is found in the south america. recently the genome sequencing of c. aperea was done, but no more information of its mitochondrial had been reported. herein, we assembled the complete mitochondrial genome sequence of c. aperea. it is a 16 835 bp long sequence with most mitogenome's characteristic structure; 13 protein-coding genes, 2 rrna genes, 22 trna genes, 1 d-loop region, 1 repeat region and 3 sts regions. the gc-content of our fresh sequence is 3 ... | 2016 | 26470830 |
| diseases in pet guinea pigs: a retrospective study in 1000 animals. | guinea pigs are commonly kept as pet animals; however, information about particular disease prevalence is lacking. the objective of this article was to present disease prevalence in 1000 pet guinea pigs from private owners divided into three age groups: under two years; between two and five years; and above five years. medical records of guinea pigs (cavia aperea f. porcellus) that were presented to the authors' clinic in the period from january 2008 to august 2013 were reviewed. the most common ... | 2015 | 26198213 |
| cardiothoracic ratio and vertebral heart scale in clinically normal black-rumped agoutis (dasyprocta prymnolopha, wagler 1831). | wild rodents, such as the lowland paca (cuniculus paca), capybara (hydrochoerus hydrochaeris), rock cavy (kerodon rupestris), guinea pig (cavia aperea), and black-rumped agouti (dasyprocta prymnolopha) are intensely hunted throughout amazonia and at the semiarid regions of northeastern brazil. to contribute to the preservation of these species, more information about their anatomy, physiology and pathophysiology is needed. the aim of this study was to standardize the vertebral heart scale (vhs) ... | 2015 | 26056885 |
| seasonally different reproductive investment in a medium-sized rodent (cavia aperea). | pronounced seasonal variations in day length, temperature, and resource availability characterize the temperate regions and strongly influence the animals living in these environments. to survive and reproduce successfully, animals must allocate resources among competing physiological systems, and they usually adjust their time of breeding to the most adequate season. here, we examined whether reproductive investment in the wild guinea pig (cavia aperea) differs across seasons. we kept animals i ... | 2015 | 26050611 |
| within-litter differences in personality and physiology relate to size differences among siblings in cavies. | many aspects of an animal's early life potentially contribute to long-term individual differences in physiology and behaviour. from several studies on birds and mammals it is known that the early family environment is one of the most prominent factors influencing early development. most of these studies were conducted on highly altricial species. here we asked whether in the highly precocial cavy (cavia aperea) the size rank within a litter, i.e. whether an individual is born as the heaviest, th ... | 2015 | 25802020 |
| whole genome sequencing and methylome analysis of the wild guinea pig. | dna methylation is a heritable mechanism that acts in response to environmental changes, lifestyle and diseases by influencing gene expression in eukaryotes. epigenetic studies of wild organisms are mandatory to understand their role in e.g. adaptational processes in the great variety of ecological niches. however, strategies to address those questions on a methylome scale are widely missing. in this study we present such a strategy and describe a whole genome sequence and methylome analysis of ... | 2014 | 25429894 |
| computed tomography analysis of guinea pig bone: architecture, bone thickness and dimensions throughout development. | the domestic guinea pig, cavia aperea f. porcellus, belongs to the caviidae family of rodents. it is an important species as a pet, a source of food and in medical research. adult weight is achieved at 8-12 months and life expectancy is ∼5-6 years. our aim was to map bone local thickness, structure and dimensions across developmental stages in the normal animal. guinea pigs (n = 23) that had died of natural causes were collected and the bones manually extracted and cleaned. institutional ethical ... | 2014 | 25289194 |
| characterization of fetal growth by repeated ultrasound measurements in the wild guinea pig (cavia aperea). | fetal growth during pregnancy has previously been studied in the domesticated guinea pig (cavia aperea f. porcellus) after dissecting pregnant females, but there are no studies describing the fetal growth in their wild progenitor, the wild guinea pig (c aperea). in this study, 50 pregnancies of wild guinea pig sows were investigated using modern ultrasound technique. the two most common fetal growth parameters (biparietal diameter [bpd] and crown-rump-length [crl]) and uterine position were meas ... | 2014 | 24950617 |
| animal housing and welfare: effects of housing conditions on body weight and cortisol in a medium-sized rodent (cavia aperea). | rodents are the most abundant experimental nonhuman animals and are commonly studied under standard laboratory housing conditions. as housing conditions affect animals' physiology and behavior, this study investigated the effects of indoor and outdoor housing conditions on body weight and cortisol level of wild cavies, cavia aperea. the changing housing condition strongly influenced both parameters, which are commonly used as indicators for animal welfare. the transfer from outdoor to indoor enc ... | 2014 | 24665951 |
| photoperiodic effects on reproductive development in male cavies (cavia aperea). | age at maturity is a particularly important life history parameter, as it predicts potential life time reproductive success in many small mammal species. animals should therefore optimize the timing of maturation by reacting to environmental stimuli that predict future environmental conditions. photoperiod often reliably predicts ecological conditions. animals born into a photoperiod indicating favorable conditions (spring, summer) may mature earlier and at a lower weight than animals born into ... | 2013 | 24513553 |
| photoperiodic effects on reproductive development in male cavies (cavia aperea). | age at maturity is a particularly important life history parameter, as it predicts potential life time reproductive success in many small mammal species. animals should therefore optimize the timing of maturation by reacting to environmental stimuli that predict future environmental conditions. photoperiod often reliably predicts ecological conditions. animals born into a photoperiod indicating favorable conditions (spring, summer) may mature earlier and at a lower weight than animals born into ... | 2014 | 24432357 |
| learning and personality types are related in cavies (cavia aperea). | the evolution and maintenance of consistent individual differences, so called animal personalities, have attracted much research interest over the past decades. variation along common personality traits, such as boldness or exploration, is often associated with risk-reward trade-offs. individuals that are bolder and hence take more risks may be more successful in acquiring resources over the short term. cautious individuals taking fewer risks may, on the other hand, live longer, but may also gat ... | 2014 | 24127657 |
| sex-specific impact of prenatal stress on growth and reproductive parameters of guinea pigs. | body condition and reproductive maturation are parameters of reproductive success that are influenced by sexual hormones rising in the circulation during the time of puberty. various endocrine systems can be programmed by conditions experienced during early life. stress for instance is supposed to be capable of influencing fetal development, leading to adjustments of offspring's later physiology. we examined whether prenatal stress (induced by exposure to strobe light) during early- to mid-gesta ... | 2012 | 22714716 |
| patch choice by guinea pigs: is patch recognition important? | using four guinea pigs (cavia aperea f. porcellus) as subjects we tested the predictions of three versions of a rate-maximizing model in a patch choice foraging task. patches were of two types which differed in interval between captures and in number of prey within each patch. in the model, the optimal policy is expressed as the threshold difference in inter-prey interval between the two patch types beyond which it pays to reject poor patches. the model versions are: a) recognizer (capable of id ... | 1994 | 24924929 |
| olfactory recognition of individuals by male cavies (cavia aperea). | in one study, using a habituation procedure, male south american cavies,cavia aperea, distinguished individual differences in odors collected from three sources: perineal gland secretions, urine, and supracaudal gland secretions. in a second study, male cavies spent more noninvestigatory time and rested more on the side of a cage containing the odor of a familiar subordinate male as compared to the cage side containing the odor of a familiar dominant male. since the odor source was a glass plate ... | 1982 | 24413966 |
| alloscardovia venturai sp. nov., a fructose 6-phosphate phosphoketolase-positive species isolated from the oral cavity of a guinea-pig (cavia aperea f. porcellus). | a slightly irregular, short rod-shaped bacterial strain, moziv/2t, showing activity of fructose 6-phosphate phosphoketolase was isolated from the oral cavity of a home-bred guinea-pig. based on comparative 16s rrna gene sequence analyses, its closest relatives were alloscardovia omnicolens dsm 21503t and alloscardovia criceti dsm 17774t with 96.0 and 95.6 % pairwise similarities, respectively. completeness of the compared sequences was 97.3 and 96.9 %, respectively. growth was found only under a ... | 2017 | 28820091 |
| lactobacillus caviae sp. nov., an obligately heterofermentative bacterium isolated from the oral cavity of a guinea pig (cavia aperea f. porcellus). | a gram-stain-positive, facultatively anaerobic, and catalase- and oxidase-negative bacterial strain designated mozm2t, having 98.4 % 16s rrna gene sequence identity with lactobacillus reuteri dsm 20016t, was isolated from a swab of the oral cavity of a home-bred guinea pig. comparative analyses based on the hsp60, phes and tuf genes confirmed l. reuteri as its closest relative species, with calculated sequence similarities of 92.8, 88.8 and 96.9 %, respectively. dna-dna hybridisation revealed a ... | 2017 | 28820096 |
| cryptosporidium homai n. sp. (apicomplexa: cryptosporidiiae) from the guinea pig (cavia porcellus). | the morphological, biological, and molecular characterisation of a new cryptosporidium species from the guinea pig (cavia porcellus) are described, and the species name cryptosporidium homai n. sp. is proposed. histological analysis conducted on a post-mortem sample from a guinea pig euthanised due to respiratory distress, identified developmental stages of c. homai n. sp. (trophozoites and meronts) along the intestinal epithelium. molecular analysis at 18s rrna (18s), actin and hsp70 loci was t ... | 2017 | 28969844 |
| trophic ecology of sympatric small cats in the brazilian pampa. | information about resource partitioning among small cat species that live in sympatry in south america is fairly incomplete. knowledge about feeding habits is essential for understanding the role of these predators in the environment, the impact on prey populations, and potential competition among themselves and with other carnivores. this study aimed to describe and compare the diet of four sympatric small cats in the grasslands of southern brazil. we analysed the stomach contents of 37 geoffro ... | 2018 | 30052676 |
| [first report on leptospira interrogans in the sigmodontine rodent scapteromys aquaticusprimeiro relato da presença de leptospira interrogans em roedores sigmodontíneos scapteromys aquaticus]. | leptospirosis is a globally distributed zoonosis that can be transmitted through direct or indirect contact with the urine or tissues of infected animals. in argentina, leptospirosis is endemic in the province of santa fe and epidemic outbreaks occur during floods. however, very little is known about the role that wild rodents play in the spread of the disease in argentina. the objective of this study was to identify the host species of pathogenic leptospira among rodents in a riverine settlemen ... | 2018 | 31093111 |
| effect of gnrh agonist deslorelin implant on spermatogenesis and testosterone concentration in guinea pigs (cavia aperea porcellus). | guinea pigs are social animals that are often kept in groups regardless of their gender. due to reproduction control and male aggressiveness prevention, surgical castration is commonly required. in the present study, we evaluated the effect of gnrh agonist implant (4.7 mg deslorelinum) on the serum testosterone concentration (t) and spermatogenesis in male guinea pigs. twenty-four animals were divided into two groups. all animals in the first group were neutered (group 1), animals in the second ... | 2020 | 32679355 |
| effect of season on reproductive behaviors and fertilization success in cavies (cavia aperea). | finding the optimal timing for breeding is crucial for small mammals to ensure survival and maximize lifetime reproductive success. species living in temperate regions therefore often restrict breeding to seasons with favorable food and weather conditions. although caviomorph rodents such as guinea pigs are described as non-seasonal breeders, a series of recent publications has shown seasonal adaptations in litter size, offspring birth mass and maternal investment. here, we aim to test if season ... | 2018 | 29649721 |
| use of an argentinean wildlife tissue collection for epidemiological studies of histoplasmosis. | histoplasmosis is a worldwide systemic endemic mycosis caused by several cryptic species included within the histoplasma capsulatum complex. domestic and wild mammals are susceptible to infection by this fungus and could be used as indicators of its presence in the environment. the aim of the study was to identify the natural reservoirs of h. capsulatum in the argentinean humid pampas eco-region analyzing a wildlife frozen-tissue collection and trace its distribution patterns over time and space ... | 2020 | 31993951 |
| ornithodoros cerradoensis n. sp. (acari: argasidae), a member of the ornithodoros talaje (guérin-méneville, 1849) group, parasite of rodents in the brazilian savannah. | ornithodoros cerradoensis n. sp. is described from field-collected and laboratory reared nymphs, males, females, and larvae parasitizing the rodents cavia aperea and thrichomys sp. in the brazilian savannah. this new species is morphologically and genetically related with the ornithodoros talaje group and can be separated from other neotropical species using the following combination of characters: larva with 18 pairs of setae on dorsum (seven anterolateral, four central and seven posterolateral ... | 2020 | 32723643 |
| within-family environment and cross-fostering stress affect behavior and physiology in wild cavies (cavia aperea). | stability of personality traits is well-documented for a wide variety of animals. however, previous results also suggest that behavioral phenotypes are plastic during early ontogeny and can be adaptively shaped to the social environment. in cavies (cavia aperea), it has already been documented that the size at birth relative to siblings (size rank) greatly influences various behavioral and physiological traits that last at least until independence. the aim of the current study was (1) to investi ... | 2020 | 32116966 |
| senescence and costs of reproduction in the life history of a small precocial species. | species following a fast life history are expected to express fitness costs mainly as increased mortality, while slow-lived species should suffer fertility costs. because observational studies have limited power to disentangle intrinsic and extrinsic factors influencing senescence, we manipulated reproductive effort experimentally in the cavy (cavia aperea) which produces extremely precocial young. we created two experimental groups: one was allowed continuous reproduction (cr) and the other int ... | 2019 | 31380034 |
| cortisol during adolescence organises personality traits and behavioural syndromes. | despite the growing evidence for the importance of developmental experiences shaping consistent individual differences in behaviour and physiology, the role of endocrine factors underlying the development and maintenance of such differences across multiple traits, remains poorly understood. here, we investigated how an experimental manipulation of circulating glucocorticoids during early adolescence affects behavioural and physiological variation and covariation later in life in the precocial ca ... | 2018 | 29953885 |
| life-history trade-offs: are they linked to personality in a precocial mammal (cavia aperea)? | life-history trade-offs are predicted to contribute to the maintenance of personality variation. individuals with 'fast' lifestyles should develop faster, reproduce earlier and exhibit more risky behaviours. evidence for such predicted links, however, remains equivocal. here, i test how growth rate, timing of maturation, litter size and maternal effort correlate with exploration, boldness, fearlessness, docility and escape latency. i found several links that were predicted by recent theory while ... | 2018 | 29669847 |