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A spatial risk assessment of bighorn sheep extirpation by grazing domestic sheep on public lands [PDF]
Preventive Veterinary Medicine, 2014 Bighorn sheep currently occupy just 30% of their historic distribution, and persist in popula-tions less than 5% as abundant overall as their early 19th century counterparts.
O\u27Brien, Joshua M. +5 more
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Winter bioenergetics of Rocky Mountain bighorn sheep
Canadian Journal of Zoology, 1978Changes in voluntary dry matter intake, body weight, and resting metabolic rates at 10 and −10 °C were measured in four adult Rocky Mountain bighorn sheep from October until May. Voluntary intake in mid-February decreased to 0.55 of that in mid-October. Body weights increased until January after which stasis or slight declines occurred.
R W, Chappel, R J, Hudson
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TRANSPLACENTAL TRANSMISSION OF Protostrongylus SPP. IN BIGHORN SHEEP
Journal of Wildlife Diseases, 1972Third-stage larvae of Protostrongylus spp. were recovered from the liver and lungs of a bighorn sheep foetus and from the placenta of the ewe.
C P, Hibler, R E, Lange, C J, Metzger
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DETECTION PROBABILITY AND PASTEURELLACEAE SURVEILLANCE IN BIGHORN SHEEP
Journal of Wildlife Diseases, 2012We investigated the influence of detection probability (i.e., the probability of detecting the disease or organism of interest) on the repeatability of results reported from bacterial culture tests used to demonstrate the presence of species in the Pasteurellaceae family that infect bighorn sheep (Ovis canadensis).
Daniel P, Walsh +3 more
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Ingestion of Grit by Bighorn Sheep
The Journal of Wildlife Management, 1974During spring and early summer in 1970 grit was found to comprise a considerable percentage of the dry weight of feces in two Alberta bighorn sheep (Ovis canadensis) herds. Similar percentages of fecal grit in domestic sheep in New Zealand have been correlated with high tooth wear, a factor which results in such impaired metabolic performance that ...
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PASTEURELLA SPP. IN SYMPATRIC BIGHORN AND DOMESTIC SHEEP
Journal of Wildlife Diseases, 1997Domestic sheep were sighted at different times from 1991 to 1993 on four Nevada (USA) ranges occupied by bighorn sheep. Nasal and pharyngeal swab samples were collected from both sheep species and cultured to determine if any strains of Pasteurella spp. were shared on range conditions after contact of the two species. Pasteurella spp.
A C, Ward +6 more
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Reproductive gambling in bighorn sheep (ovis): A simulation
Journal of Theoretical Biology, 1982Abstract It has been hypothesized that bighorn sheep living in unpredictable desert environments may resort to a life history pattern of reproductive gambling in which they have increased fertility because of continuous breeding. To determine whether such gambling is in fact feasible, simulations of a seasonal and gambling population were run with ...
M S, Lenarz, W, Conley
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IMMUNOGLOBULIN RESPONSE OF THE ROCKY MOUNTAIN BIGHORN SHEEP
Journal of Wildlife Diseases, 1971The effects of individual variation, season and parasite activity on the levels of the four major immunoglobulins, IgM, IgA, IgG1 and IgG2, were analyzed in four adult Rocky Mountain bighorn ewes. Individual variation was significant for all immunoglobulin classes. Seasonal effects were detected in the levels of IgG1. The fecal count of Protostrongylus
R, Hudson, W D, Kitts, P J, Bandy
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Seasonality of Births in Bighorn Sheep
Journal of Mammalogy, 1997Two populations of bighorn sheep ( Ovis canadensis ) in contrasting habitats at the same latitude were studied for 3 years to examine effects of climate and nutrition on seasonality of births. The number of births peaked during February and March in the Mojave Desert and during mid-June in the Rocky Mountains.
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