Results 221 to 230 of about 261,975 (279)
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MAXILLARY CANINES IN BIGHORN SHEEP
The Southwestern Naturalist, 2006Abstract Bighorn sheep (Ovis canadensis) occasionally have small, procumbent maxillary canines that do not penetrate the gums. However, the frequency of these vestigial teeth is only 3%. We collected 25 skulls from an isolated and indigenous population of bighorn sheep in the Silver Bell Mountains, Arizona.
Brian D. Jansen, Paul R. Krausman
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The Journal of Wildlife Management, 1966
Twelve bighorn ewes (Ovis canadensis), killed by vehicular traffic in southern British Columbia, were examined for pregnancy; 11 were pregnant, 4 of them were carrying twins. The absence of twins among bighorn sheep frequently has been noted by biologists recording their field observations. A recent author (Woodgerd, W. 1964.
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Twelve bighorn ewes (Ovis canadensis), killed by vehicular traffic in southern British Columbia, were examined for pregnancy; 11 were pregnant, 4 of them were carrying twins. The absence of twins among bighorn sheep frequently has been noted by biologists recording their field observations. A recent author (Woodgerd, W. 1964.
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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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FATAL PNEUMONIA OF BIGHORN SHEEP FOLLOWING ASSOCIATION WITH DOMESTIC SHEEP
Journal of Wildlife Diseases, 1982During 1979-1980 acute fibrinopurulent bronchopneumonia resulted in high mortality or total loss of herds of bighorn sheep (Ovis canadensis) in California and Washington. Contact with domestic sheep occurred shortly before the onset of disease in each case.
W J, Foreyt, D A, Jessup
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Inbreeding depression in captive bighorn sheep
Animal Conservation, 2001We estimated the extent of inbreeding depression for juvenile survival in 589 captive-born bighorn sheep, and, unlike an earlier report, found no evidence of significant inbreeding depression. There did not appear to be any overall effect of year of birth, place of birth, subspecies, sex or ancestral inbreeding upon the viability of inbred animals as ...
S. T. Kalinowski, P. W. Hedrick
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Cooperative Defense by Female Bighorn Sheep
Northwestern Naturalist, 1994Observations of cooperative defense against predators by bighorn sheep (Ovis canadensis) are rare. Shank (1977) and Woolf and O'Shea (1968) observed cooperative anti-predator defense by O. canadensis rams against coyotes (Carlis latrans), and Hornocker (1969) reported group defense by three ewes against a bobcat (Lynx rutus).
Nike J. Goodson, David R. Stevens
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Survival of Adult Female Bighorn Sheep Following a Pneumonia Epizootic
, 2020Beginning in the early 1900s, poly‐factorial, poly‐microbial pneumonia was identified as a disease affecting bighorn sheep (Ovis canadensis) and it continues to threaten bighorn populations, posing an ongoing management challenge. In May and June 2013, a
Daniella J. Dekelaita +8 more
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SAGUARO SPINE PENETRATED BIGHORN SHEEP SKULL
The Southwestern Naturalist, 2005Animals that inhabit vegetative communities where thorns and spines are common should be capable of moving while avoiding injury from thorns and spines. On 21 December 2003, we found that a saguaro cactus (Carnegiea gigantea) spine had penetrated the lacrimal bone into the orbit of a desert bighorn sheep (Ovis canadensis) in south-central Arizona.
Brian D. Jansen +3 more
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Bluetongue in the Desert Bighorn Sheep
The Journal of Wildlife Management, 1967A young desert bighorn ram (Ovis canadensis) approximately 8 months old was found ill in its natural habitat. Inoculation of a suspension of its lung tissue into domestic sheep resulted in lesions typical of bluetongue disease. Serological studies confirmed the diagnosis.
R. M. Robinson +3 more
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Social dominance in female bighorn sheep
Zoo Biology, 1986AbstractA group of six individually identified bighorn ewes (Ovis canadensis canadensis) in the Denver Zoo, Denver, Colorado, was studied to determine the existence of a dominance hierarchy. Using success in displacement interactions as an index to rank, a very linear, age‐related hierarchy was found.
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