Publications

serum lipid concentrations in six canid and four ursid species in four zoos.	serum lipid levels were measured in healthy captive wild canids and ursids, and the values were compared with previously published data. serum lipid levels were evaluated in blood samples collected from eight african wild dogs (lycaon pictus), three arctic foxes (alopex lagopus), nine gray wolves (canis lupus), four maned wolves (chrysocyon brachyurus), two mexican wolves (canis lupus baleiyi), nine red wolves (canis rufus), two brown bears (ursus arctos), six polar bears (ursus maritimus), six ...	2004	15193071
crystal structure of hemoglobin from the maned wolf (chrysocyon brachyurus) using synchrotron radiation.	crystal structure of hemoglobin isolated from the brazilian maned wolf (chrysocyon brachyurus) was determined using standard molecular replacement technique and refined using maximum-likelihood and simulated annealing protocols to 1.87a resolution. structural and functional comparisons between hemoglobins from the chrysocyon brachyurus and homo sapiens are discussed, in order to provide further insights in the comparative biochemistry of vertebrate hemoglobins.	2003	14683506
serologic response of maned wolves (chrysocyon brachyurus) to canine and canine parvovirus vaccination distemper virus.	this study evaluated the immune response of 47 (22 males, 25 females) captive maned wolves (chrysocyon brachyurus) to modified-live canine parvovirus and canine distemper virus (onderstepoort and rockborn strains) vaccines. sera were collected from 33 adults and 14 pups, including five free-ranging pups captured at 1 yr of age or younger. all the adults and four captive-born pups had been vaccinated prior to this first blood collection. virus neutralization and hemagglutination-inhibition assays ...	2001	12790399
birth and mortality of maned wolves chrysocyon brachyurus (illiger, 1811) in captivity.	the aims of this study were to verify the distribution of births of captive maned wolves chrysocyon brachyurus and the causes of their deaths during the period from 1980 to 1998, based on the registry of births and deaths in the international studbook for maned wolves. to determine birth distribution and average litter size, 361 parturitions were analyzed for the 1989-98 period. to analyze causes of mortality, the animals were divided into four groups: 1. pups born in captivity that died prior t ...	2002	12185920
capillariidae eggs found in the urine of a free ranging maned wolf from argentina.	the first finding of a capillariid in the urinary tract of a free ranging maned wolf (chrysocyon brachyurus) is described. the individual was an adult male attacked by dogs in the locality of cayastacito (santa fe, argentina, 31 degrees 05' s, 60 degrees 34' w). eggs found in urine measured 64.6-66.9 micrometer (mean 65.4 micrometer) x 26.9-31 micrometer (mean 29 micrometer). further studies are needed to determine whether this finding corresponds to a new capillariid species, related to c. brac ...	2002	12118281
molecular systematics of the canidae.	despite numerous systematic studies, the relationships among many species within the dog family, canidae, remain unresolved. two problems of broad evolutionary significance are the origins of the taxonomically rich canidae fauna of south america and the development in three species of the trenchant heel, a unique meat-cutting blade on the lower first molar. the first problem is of interest because the fossil record provides little evidence for the origins of divergent south american species such ...	1997	11975336
treatment of fibrosarcoma in a maned wolf (chrysocyon brachyurus) by rostral maxillectomy.	a 12-yr-old captive intact male maned wolf (chrysocyon brachyurus) was diagnosed with a fibrosarcoma of the incisive bones. the mass was excised by rostral maxillectomy, and the wolf remained normal and on display with good function and cosmetics for 7 mo. subsequently, it became weak, ataxic, and dyspneic and was euthanatized. at necropsy, there was a small regrowth of the maxillary tumor, a metastatic mediastinal mass, and multiple metastatic lung masses, suggesting that oral fibrosarcoma in m ...	2000	11237149
serum concentrations of vitamin d metabolites, vitamins a and e, and carotenoids in six canid and four ursid species at four zoos.	nutritional status for six captive canid species (n=34) and four captive ursid species (n=18) were analyzed. the species analyzed included: african wild dog (lycaon pictus), arctic fox (alopex lagopus), gray wolf (canis lupus), maned wolf (chrysocyon brachyurus), mexican wolf (canis lupus baleiyi), red wolf (canis rufus), brown bear (ursus arctos), polar bear (ursus maritimus), spectacled bear (tremarctos ornatus), and sun bear (ursus malayanus). diet information was collected for these animals ...	2001	11137448
conservation value of a native forest fragment in a region of extensive agriculture.	a survey of mammals and birds was carried out in a semi-deciduous forest fragment of 150 ha located in a zone of intensive agriculture in ribeirão preto, state of são paulo, south-eastern brazil. line transect sampling was used to census mammals and birds during six days, totalling 27.8 km of trails and 27.8 hours of observation. twenty mammal species were confirmed in the area (except bats and small mammals), including rare or endangered species, such as the mountain lion (puma concolor), the m ...	2000	10959107
cystine nephrolithiasis in an endangered canid, chrysocyon brachyurus (carnivora: canidae).		1999	10883330
longitudinal fecal steroid excretion in maned wolves (chrysocyon brachyurus).	this study used a fecal steroid monitoring technique to evaluate reproductive cycles in male (4) and female (15) maned wolves, endangered south american canids. a radiolabeled testosterone infusion on a male revealed a fast and predominantly fecal route of excretion for this steroid. testosterone was also excreted as eight unidentified metabolites, which was not the primary form of this steroid quantified in our assays. fecal steroid concentrations (estradiol, e2; progestins, p; testosterone, t) ...	1998	9748408
karyotype of south american pampas fox pseudalopex gymnocercus (carnivora, canidae).	the karyotype of the pampas fox has 2n=74 and a nf=76. except for chrysocyon brachyurus, 2n=74 is a common diploid number for the south american canidae. this number is higher than in the vulpes group and lower than in the group of the typical canis. no 'marker chromosomes' are present in the south american canidae.	1980	7418837
cystinuria in the maned wolf of south america.	of 42 maned wolves in zoos or live-trapped in brazil, 34 had excessive cystine in their urine. renal clearance studies of five of the affected wolves revealed a variable defect for the reabsorption of cystine and dibasic amino acids. the renal tubular handling of other solutes including glucose, phosphate, sodium, potassium, and uric acid was considered normal. urinary calculi composed of cystine were found in four wolves and proved fatal in three of them. with the exception of the high incidenc ...	1981	7233184
parvovirus enteritis in vaccinated juvenile bush dogs.	parvovirus enteritis developed in 10 of 17 vaccinated juvenile bush dogs (speothos venaticus) from 4 litters in a 5-month period. nine dogs died. the first outbreak involved 6 of 9 bush dogs from 2 litters. each had been vaccinated with a killed feline-origin parvovirus vaccine at 11 and 14 weeks of age. the 6 affected dogs became ill at 29 weeks of age and died. the second outbreak involved a litter of 6 bush dogs. each had been vaccinated every 2 weeks starting at 5 weeks of age. two were isol ...	1982	6890953
clinical trials with canine distemper vaccines in exotic carnivores.	two types of killed canine distemper virus (cdv) vaccine and a modified-live cdv vaccine were clinically evaluated in four species of exotic carnivores. in 16 trials in which 13 red pandas (ailurus fulgens) were given the killed vaccine, only 1 animal had a virus-neutralization titer that exceeded 1:100. a red panda given modified-live cdv vaccine deemed safe for gray foxes and ferrets died of bacterial pneumonia 16 days later. there was no pathologic evidence of canine distemper in that panda. ...	1983	6358163
[the kidney worm--dioctophyme renale--(goeze, 1782, stiles, 1901) as cause of death in a maned wolf (chryosocyon jubatus)].		1966	6010492
[dioctophyma renale (dioctophymoidea, nematoda) in a maned wolf (chrysocyon brachyurus)].		1972	5019466
studies on two cases of dioctophyma renale (goeze, 1782) infection in chrysocyon brachyurus (illiger).		1972	4271846
[studies on rabies in brazil. i. occurrence of rabies in the pampas wolf (chrysocyon brachyurus)].		1968	4230925
encephalomalacia in maned wolves (chrysocyon brachyurus) associated with possible disseminated intravascular coagulation syndrome.		1987	3606507
chromosomal evolution of the canidae. i. species with high diploid numbers.	the giemsa banding patterns of seven canid species, including the grey wolf (canis lupus), the maned wolf (chrysocyon brachyurus), the bush dog (speothos venaticus), the crab-eating fox (cerdocyon thous), the grey fox (urocyon cinereoargenteus), the bat-eared fox (otocyon megalotis), and the fennec (fennecus zerda), are presented and compared. relative to other members of canidae, these species have high diploid complements (2n greater than 64) consisting of largely acrocentric chromosomes. they ...	1987	3568761
renal hyperostotic osteodystrophy associated with unilateral renal aplasia in a captive maned wolf.		1986	3503153
the majority of vitamin a is transported as retinyl esters in the blood of most carnivores.	1. in canines and mustelides total vitamin a was 10-50 times higher compared to other species due to a high amount of retinyl esters (40-99% of total vitamin a) in blood plasma. the dominant vitamin a ester was in most species retinyl stearate. 2. in ursidae, procyonidae, viveridae and felidae, total vitamin a was much lower. when present, however, retinyl esters also represented 10-65% of total vitamin a in plasma. 3. only retinol was detected in plasma of the family, hyaenidae, and the suborde ...	1990	1971545
cystinuria in a maned wolf.	a renal calculus composed principally of the amino acid, cystine, was found in an 8-year-old male maned wolf (chrysocyon brachyurus). cystine crystals were found in the urine sediment. the renal clearance of 10 amino acids was abnormal, whereas reabsorption of others was normal. the renal clearance of cystine, lysine, ornithine, and arginine exceeded the filtered load. the renal tubular handling of glucose, phosphate, sodium, potassium, and uric acid was identical to that for the clinically norm ...	1978	738937