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Full-Text Articles in Physical Sciences and Mathematics
Surgical Sterilization As A Method Of Reducing Coyote Predation On Domestic Sheep, Cassity Bromley, Eric M. Gese
Surgical Sterilization As A Method Of Reducing Coyote Predation On Domestic Sheep, Cassity Bromley, Eric M. Gese
USDA Wildlife Services: Staff Publications
Predation by coyotes (Canis latrans) on domestic sheep is a problem for many livestock producers throughout the United States Intermountain West. We examined whether surgical sterilization of coyote packs would modify their predatory behavior and reduce predation rates on domestic sheep as compared to coyote packs with pups. From June 1997 to December 1997, we gathered baseline information on coyote pack size and movements. In winter 1998, we surgically sterilized and radio-collared members of 5 coyote packs. We also captured and radio-collared members of 6 packs that remained intact (i.e., reproductive). During summer 1998, only 1 sterile pack …
Pulp Cavity-Tooth Width Ratios From Known-Age And Wild-Caught Coyotes Determined By Radiography, Frederick F. Knowlton, Susan L. Whittemore
Pulp Cavity-Tooth Width Ratios From Known-Age And Wild-Caught Coyotes Determined By Radiography, Frederick F. Knowlton, Susan L. Whittemore
USDA Wildlife Services: Staff Publications
Although the relative sizes of pulp cavities in teeth are used frequently to identify various age classes of carnivores, validation of the technique has received little attention. We measured the pulp cavities and tooth widths based on radiographs of canine and premolar teeth from a large sample of known-age, pen-reared coyotes (Canis latrans) and from samples of wild-caught coyotes of unknown age. The ratio of pulp cavity to tooth width decreased rapidly through the first year of life. Although canine tooth ratios of juvenile, yearling, and adult coyotes differed, variations within yearling and adult groups precluded accurate assignment …
Using Iophenoxic Acid Injections Of Prey To Identify Mammals That Feed On Them, Frederick F. Knowlton, Stanley R. Olmstead
Using Iophenoxic Acid Injections Of Prey To Identify Mammals That Feed On Them, Frederick F. Knowlton, Stanley R. Olmstead
USDA Wildlife Services: Staff Publications
Identifying species or individuals that feed upon other species of animals is an important aspect of some predation studies. We evaluated the effectiveness with which the biomark associated with iophenoxic acid (IA) injections was transferred from domestic goats to coyotes (Canis latrans) that fed on them. We injected doses of 100, 300, or 1,000 mg of IA into goats to raise serum iodine levels, fed meat from the injected goats to coyotes, and monitored serum iodine levels in both species for about I20 days. Within 3 days, mean serum iodine levels in goats increased from 5.33 mcg/I 00 ml to …
Serological Responses Of Coyotes To Two Commercial Rabies Vaccines, Frederick F. Knowlton, Marianna Roetto, Deborah Briggs
Serological Responses Of Coyotes To Two Commercial Rabies Vaccines, Frederick F. Knowlton, Marianna Roetto, Deborah Briggs
USDA Wildlife Services: Staff Publications
Between August 1993 and September 1994 we documented serological responses of coyotes (Canis latrans) vaccinated with two commercial rabies vaccines licensed for use in domestic dogs. Serologic responses were documented by testing for rabies virus neutralizing antibodies with the rapid fluorescent focus inhibition test (RFFIT) at 30, 90, 180, 270, and 365 days post-vaccination. All coyotes vaccinated with Imrab 3® (Rhone-Merieux, Inc.), and 75% of those vaccinated with Dura-Rab 3® (Immunovet, Inc.) seroconverted, as evidenced by the presence of antirabies antibody titers ≥1:5 in one or more of the five post-vaccination samples. The percent of coyotes …