Subject(s)
Cattle/embryology , Embryo, Mammalian , Notochord/physiology , Animals , Embryo, Mammalian/physiology , Gestational Age , GrowthABSTRACT
A total of 181 coyotes (Canis latrans) was examined for helminth parasites Filaroides osleri, Capillari aerophila, and Spirocerca lupi. Coyote carcasses were obtained from Kansas, western Oklahoma-northern Texas, Colorado, New Mexico, Arizona and southern California. Cysts of F. osleri were present in the trachea or bronchial division in 39 (22%) coyotes. C. aerophila were present in only 7 (4%) coyotes. S. lupi lesions were present in the aorta of 59 (33%) coyotes. Esophageal infections of S. lupi were found in only 4 of 142 (3%) coyotes. F. osleri, C. aerophila and S. lupi infections were more prevalent in western Oklahoma-northern Texas, low in southern Arizona-California, and absent in northern Arizona.
Subject(s)
Carnivora , Parasitic Diseases, Animal , Animals , Filariasis/veterinary , Helminthiasis, AnimalABSTRACT
A total of 395 coyotes (Canis latrans) was examined in the field for lungworms (Filaroides osleri and Capillaria aerophila) with 60 trachea and bronchial trees returned to the laboratory for detailed examination. Coyote carcasses were obtained from eight central states (Oklahoma, Colorado, Wyoming, Iowa, South Dakota, Nebraska, Texas, and three regions of Kansas). Cysts of F. osleri were present in the trachea or first division of bronchi of 68 (17%) of the coyotes examined. C. aerophila infections were identified during field examinations, primarily by the excess mucus in the bronchi, in 151 (38%) coyotes. Nearly 6% of the coyotes examined were infected with both lungworm species. A total of 195 (49%) coyotes had at least one species of lungworm. Filaroides was less frequent in Iowa and Kansas; Capillaria infections were present in at least 30% of the coyotes examined at all stations.
Subject(s)
Carnivora , Lung Diseases, Parasitic/veterinary , Nematode Infections/veterinary , Animals , Capillaria , Lung/parasitology , Lung Diseases, Parasitic/parasitology , Nematode Infections/parasitologyABSTRACT
The cycle of the seminiferous epithelium in M. o. ochrogaster was divided into eight readily recognizable stages based on the morphology of the developing spermatid. The mean relative frequencies of Stages I through VIII were 11.6, 19.25, 20.00, 19.00, 8.42, 6.17, 9.25 and 6.58%, respectively. The duration of one cycle of the seminiferous epithelium in this species, as determined from autoradiographs of thymidine-H3 injected testes was 7.17 days (S.E. +/- 0.03). This is the shortest spermatogenic cycle reported for any mammal to date. The approximate durations of the meiotic prophase, meiotic divisions, and spermiogenesis were 8.8, 0.4 and 12.2 days, respectively. The entire process of spermatogenesis was estimated to span approximately 28.68 days. The number of cycles that spermiogenesis spanned in this species was compared to values calculated for other species. Values within groups of related species appear relatively constant, but between groups the values are variable.