Publications

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changes in androgen concentrations during puberty and their relation to behaviour in male saccostomus campestris (gray 1844), an african rodent.sexual development in male saccostomus campestris, the pouched mouse, was studied in terms of morphological development and changes in concentrations of plasma testosterone and androstenedione. the interaction of adult females and males following the introduction of a male was observed at all stages of the oestrous cycle. the histology of the reproductive organs is similar to that of other rodents. measurements of the diameter of the seminiferous tubules and the width of the seminiferous epithel ...19938190910
is nest building an important component of thermoregulatory behaviour in the pouched mouse (saccostomus campestris)?the thermoregulatory significance of nest building in saccostomus campestris was investigated by examining the effect of temperature and photoperiod on the size and thermal conductance of nests built within artificial burrows by pouched mice from four localities in southern africa that experience contrasting thermal conditions. there was no correlation between the amount of nesting material used and the thermal conductance of nests, which indicates that nest size was not a reliable measure of ne ...19957777605
why do pouched mice (saccostomus campestris) hoard food?the function of food hoarding in saccostomus campestris was investigated by examining the effect of photoperiod and temperature on the amount of two different types of food that were eaten and stored in artificial burrows by pouched mice from four different localities which experience contrasting climatic regimes. food consumption was influenced by a variety of factors including the type of food, the sex of the individual, photoperiodic and temperature conditions, and the locality from which the ...19968838619
torpor patterns in the pouched mouse (saccostomus campestris; rodentia): a model animal for unpredictable environments.patterns of spontaneous and induced daily torpor were measured in the afrotropical pouched mouse (77-115 g), saccostomus campestris, in response to photoperiod, temperature, and food deprivation, using temperature telemetry. photoperiod had no influence on the incidence, depth, or duration of daily torpor in either males and females. although the testis size index decreased in response to food deprivation and photoperiod by a maximum of 24%, full testis regression did not occur. torpor bout dura ...19989646507
two new species of trichostrongyle nematodes from the australian pouched mouse, phascogale flavipes (waterhouse). 196013768484
the susceptibility of rodents to schistosome infection, with special reference to schistosoma haematobium.in this investigation the susceptibility of several species of rodents-praomys (mastomys) natalensis, saccostomus campestris, arvicanthus niloticus, aethomys chrysophilus, tatera brantsi and the white mouse (saimr 200 strain)-to schistosoma haematobium was determined and the pathology studied. from the results it is clear that these rodents are susceptible to infection with schistosoma haematobium. for various reasons, notably adaptability to laboratory conditions, the most suitable as laborator ...19665297005
impacts of ungulates on the demography and diversity of small mammals in central kenya.the impacts of ungulates on small mammals in an east african savanna habitat were investigated by monitoring the population and community responses of small mammals on replicated 4-ha plots from which ungulates had been excluded. the dominant small mammal in this habitat is the pouched mouse, saccostomusmearnsi, a medium-sized murid rodent. eight other small mammal species, including arvicanthis sp., mus sp., mastomys sp., dendromus sp., crocidura sp., and, rarely, tatera sp., aethomys sp., and ...199828308070
effects of the removal of large herbivores on fleas of small mammals.the removal of large herbivorous mammals can cause dramatic increases in the densities of small mammals. these small mammals are hosts for a variety of ectoparasites, many of which are important pathogens of human diseases such as plague and murine typhus. it is thus valuable from a human health perspective to understand if large herbivore removals can indirectly affect ectoparasite numbers and thus potentially alter disease risk. to make this determination, we experimentally excluded large herb ...200819263845
visual pigment coexpression in all cones of two rodents, the siberian hamster, and the pouched mouse.to decide whether the identical topography of short- and middle-wavelength cone photoreceptors in two species of rodents reflects the presence of both opsins in all cone cells.200212091452
reproductive activity influences thermoregulation and torpor in pouched mice, saccostomus campestris.the afrotropical pouched mouse saccostomus campestris displays sexual disparity in the use of daily torpor; males reluctantly enter torpor. we tested the hypothesis that males may compensate for a limited heterothermic capacity with lower basal and resting metabolic rates relative to females. we also investigated the association between gonadal activity (testosterone) and the propensity for daily torpor. body temperature and oxygen consumption were measured at various ambient temperatures and we ...200211824404
failure of the estrous cycle and spermatogenesis to respond to day length in a subtropical african rodent, the pouched mouse (saccostomus campestris).little is known about the role of photoperiod in the control of reproduction in mammals from the tropics in general and, in particular, from the afrotropics. the present study examined the reproductive photosensitivity of the pouched mouse (saccostomus campestris: cricetidae), a small, seasonally breeding rodent that occurs from about 12 degrees s to 33 degrees s in africa. groups of 10 laboratory-bred male pouched mice were exposed to either long-day (16l:8d) or short-day (8l:16d) conditions fo ...19957632837
reproduction in a laboratory colony of the pouched mouse, saccostomus campestris.pouched mice ovulate spontaneously and have a 4-day cycle (3-5 days). the variation was caused by prolonged oestrus. the vagina opened at about 34 days of age and the first oestrus was experienced at 44 days of age. females experienced several sterile cycles before their first conception, which occurred at an age of about 56 days. the gestation period in most cases was 21 days and implantation occurred about 4-5 days after mating. the females were not receptive post partum. litter size varied fr ...19883045308
thermoregulatory circadian rhythms in the pouched mouse (saccostomus campestris).1. circadian rhythms of body temperature (tb), oxygen consumption (vo2), and minimal thermal conductance (c) were studied in the pouched mouse, saccostomus campestris under natural photoperiod during february at a constant ambient temperature of 28 degrees c. 2. circadian rhythms of body temperature were also studied under natural photoperiod and laboratory temperatures (max: 28.1 degrees c; min: 23.2 degrees c) during february. 3. the results of the present study suggest that changes in ambient ...19882904324
pregnancy, lactation and the oestrous cycle of the pouched mouse, saccostomus campestris.the anatomy and histology of pouched mouse ovaries were studied during the oestrous cycle, pregnancy and lactation along with the relationship between the ovarian structures and circulating concentrations of progesterone. the structure of the ovaries resembled that of most rodents. follicular development indicated that ovulation takes place on the night between pro-oestrus and oestrus, i.e. at the time when mating normally occurs. corpora lutea were accumulating in cyclic females, while successi ...19892695629
ringtail in the pouched mouse (saccostomus campestris).laboratory colonies of the pouched mouse (saccostomus campestris) were housed in solid bottom cages and fed a varied diet containing excess fatty acids. ringtail was only initiated in animals of all ages, from populations originating from different areas of south africa, when the relative humidity fell below 30%. the incidence of ringtail was curtailed by maintaining relative humidity above 45% in animal houses.19902395318
regulation of corpus luteum function in the pouched mouse, saccostomus campestris.regulation of corpus luteum function was studied in pouched mice, housed under controlled conditions (14l:10d), (22 +/- 2 degrees c). prolactin in daily doses of 32 iu promoted luteal and uterine development and markedly increased plasma levels of progesterone in females exhibiting estrous cycles. negligible levels of progesterone in prolactin-treated ovariectomized females ruled out the possibility of a significant nonovarian source of progesterone. domperidone (a dopamine antagonist) induced p ...19921478441
noradrenaline thermogenesis in conscious and anaesthetised pouched mice (saccostomus campestris).1. the metabolic response to injections of noradrenaline (na) and saline (control) was investigated in conscious and anaesthetised (sodium pentobarbitone) pouched mice, saccostomus campestris. 2. na injection produced a calorigenic response which was significantly greater than that elicited by saline injection in both conscious and anaesthetised animals. 3. this calorigenic response was enhanced by motor activity in conscious pouched mice, but the exclusion of measurements recorded during visibl ...19901979264
interactive effects of temperature and photoperiod on the daily activity and energy metabolism of pouched mice (saccostomus campestris: cricetidae) from southern africa.the daily activity and energy metabolism of pouched mice (saccostomus compestris) from two localities in southern africa was examined following warm (25 degrees c) and cold (10 degrees c) acclimation under long (ld 14:10) and short (ld 10:14) photoperiod. there was no differential effect of photoperiod on the daily activity or metabolism of pouched mice from the two localities examined, which suggests that reported differences in photoresponsivity between these two populations were not the resul ...19948014258
late fetal development and selective resorption in saccostomus campestris (cricetidae).when female saccostomus campestris are stressed during pregnancy they may resorb part of the litter. resorption can take place on more than one occasion during the same pregnancy without affecting the development of the rest of the litter. the last resorption may be initiated as late as 72-48 h before parturition. no other rodents with a similar gestation appear to resorb at this stage. resorbing fetuses are isolated within uterine compartments from viable fetuses. ossification occurs at a compa ...19958848585
cross-reactivity of secondary antibodies against african rodents and application for sero-surveillance.a total of 466 rodents were captured in the republic of zambia from 2006 to 2010. based on morphological observations and phylogenetic analyses of mitochondrial gene sequences, rodents were divided into 10 groups consisting of 39 rattus rodents, 263 multimammate rats, 18 other murinae rodents, 95 gerbils, 11 pouched mice, 1 giant-pouched rat, 38 fat mice and 1 dormouse. rodent antibodies except that from rattus were examined for their cross-reactivity to commercially available antibody detection ...201323386359
seasonal energy requirements and thermoregulation of growing pouched mice, saccostomus campestris (cricetidae).pouched mice (saccostomus campestris) were born in captivity during january and march and subsequently maintained under long photoperiod (14 h light: 10 h dark) at 25 degrees c. during their first winter (july) and the following summer (january) the pouched mice were exposed to natural photoperiod in an unheated laboratory for 3 weeks prior to measurement. the pouched mice continued to grow during the study, and were significantly heavier after summer exposure than after winter exposure 6 months ...19911743777
the relative importance of photoperiod and temperature as cues for seasonal acclimation of thermoregulation in pouched mice (saccostomus campestris: cricetidae) from southern africa.the effect of short photoperiod and cold on metabolism and thermoregulation was investigated in pouched mice (saccostomus campestris: cricetidae) from three localities in southern africa which experience contrasting climatic conditions. mice were initially acclimated to long photoperiod (14l: 10d) at 25 degrees c, followed first by a decline in photoperiod (to 10l: 14d) and then by a fall in temperature (to 10 degrees c). minimum observed metabolic rate (identical to basal metabolic rate) was un ...19921494031
social environment and reproduction in female pouched mice, saccostomus campestris.pouched mice were kept under controlled conditions of illumination (10d:14l) and temperature (22 +/- 2 degrees c). age at vaginal opening, first oestrus and first conception did not differ significantly between juvenile females raised singly, in single-sex groups of 5, or with an adult male. after the introduction of a male, sterile cycles and/or matings before first conception were experienced by all females whether they were raised singly or in single-sex groups. of 10 females raised with a ma ...19892754654
schistosoma haematobium: histochemistry of glycogen, glycogen phosphorylase a and glycogen branching enzyme in niridazole-treated females.the body posterior to the ovary of schistosoma haematobium females was investigated. glycogen, glycogen phosphorylase a (ec 2.4.1.1) and glycogen branching enzyme (ec 2.4.1.18) activities were detected in the subtegumental muscle system, parenchyma and mature vitelline cells, whereas no activities were detected in the tegument and immature vitelline cells of the parasite. administration of a single niridazole dose of 250 mg kg-1 to the pouched mouse (saccostomus camestris) produced the following ...19921563921
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