Glutathione peroxidase activity and selenium levels in Rocky Mountain bighorn sheep and mountain goats

1989 ◽  
Vol 67 (10) ◽  
pp. 2493-2496 ◽  
Author(s):  
Judith Samson ◽  
Jon T. Jorgenson ◽  
W. D. Wishart
Keyword(s):  
Glutathione Peroxidase ◽  
Clinical Signs ◽  
Rocky Mountain ◽  
Selenium Deficiency ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Domestic Sheep ◽  
Oreamnos Americanus ◽  
Mountain Goats ◽  
Mountain Goat

Selenium levels and glutathione peroxidase (GSH-Px) activity were determined in the blood of wild and captive herds of bighorn sheep (Ovis canadensis), as well as in one wild mountain goat (Oreamnos americanus) herd. No significant relationship was established between blood selenium and GSH-Px activity for individual herds of bighorns, but when all herds were pooled, selenium was significantly (P < 0.01) correlated with GSH-Px. The hypothesis that bighorn sheep would exhibit higher GSH-Px activity per unit of blood selenium than domestic cattle was not supported. One bighorn population had blood selenium levels below those considered deficient in domestic sheep, yet exhibited no clinical signs of selenium deficiency. A blood selenium by GSH-Px relationship did not exist for the single mountain goat herd sampled. The seven blood samples collected from mountain goats did not differ from those from bighorn sheep in their GSH-Px activity relative to blood selenium levels.

Cardiac frequency: a potential predictor of blood cortisol levels during acute and chronic stress exposure in Rocky Mountain bighorn sheep (Ovis canadensis canadensis)

1987 ◽  
Vol 65 (8) ◽  
pp. 2028-2034 ◽  
Author(s):  
Henry J. Harlow ◽  
E. Tom Thorne ◽  
Elizabeth S. Williams ◽  
E. Lee Belden ◽  
William A. Gern
Keyword(s):  
Chronic Stress ◽  
Remote Monitoring ◽  
Acute Stress ◽  
Rocky Mountain ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Domestic Sheep ◽  
Cardiac Frequency ◽  
Acute And Chronic Stress ◽  
In Captivity

It was the purpose of this study to investigate methods of assessing responses to stress by free-ranging bighorn sheep (Ovis canadensis canadensis). The adrenal response test on wild-caught bighorn sheep maintained in captivity did not demonstrate either adrenal exhaustion or hypersensitivity during chronic stress. To study physiological responses to acute stress, hand-reared bighorn sheep were habituated to living in stalls and fitted with electrocardiogram leads and jugular cannulas for remote monitoring of cardiac frequency and blood cortisol changes. A radioimmunoassay was validated on bighorn sheep plasma which was a modification of the procedure used for domestic sheep. A linear relationship between heart rate and blood cortisol was obtained for individual animals suggesting that remote monitoring of cardiac frequency can be used as a predictor of adrenal function and, therefore, the potential immunologic condition of an animal during stress.

ROCKY MOUNTAIN BIGHORN SHEEP (OVIS CANADENSIS CANADENSIS) MILK: I. GROSS COMPOSITION AND FAT CONSTITUTION

1965 ◽  
Vol 43 (5) ◽  
pp. 885-888 ◽  
Author(s):  
E. C. H. Chen ◽  
D. A. Blood ◽  
B. E. Baker
Keyword(s):  
Fatty Acids ◽  
Milk Fat ◽  
Post Partum ◽  
Rocky Mountain ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Domestic Sheep ◽  
Milk Samples ◽  
Sheep Milk ◽  
Park Area

Milk was obtained from five Rocky Mountain bighorn sheep living in the Jasper Park area of Alberta. The milk was collected at [Formula: see text] and 3 months post partum. The gross composition and milk fat fatty acids of the milk samples and of a sample of domestic sheep milk (Suffolk, 1 month post partum) were determined.

Selenium and glutathione peroxidase activity in mountain goats

1985 ◽  
Vol 63 (7) ◽  
pp. 1544-1547 ◽  
Author(s):  
Charles T. Robbins ◽  
Steven M. Parish ◽  
Barbara L. Robbins
Keyword(s):  
Glutathione Peroxidase ◽  
Linear Function ◽  
Peroxidase Activity ◽  
Selenium Deficiency ◽  
Selenium Supplementation ◽  
Glutathione Peroxidase Activity ◽  
Oreamnos Americanus ◽  
Domestic Species ◽  
Mountain Goats ◽  
Low Selenium

Blood glutathione peroxidase (GSH-Px) activity in mountain goats (Oreamnos americanus) is a linear function of blood selenium. GSH-Px activity per unit of selenium (Se) in mountain goats is approximately double that published for the domestic cow and horse. It is hypothesized that high GSH-Px activity per unit selenium in mountain goats reduces their dietary selenium requirement relative to the above domestic species and is an essential adaptation for occupying low-selenium environments. GSH-Px activity peaked 20–30 days after injections of 0.1 and 0.3 mg Se/kg. A higher dose of 0.5 mg Se/kg delayed and decreased the development of peak GSH-Px activity relative to the two lower injection groups. When acute pathology owing to a selenium deficiency is demonstrated in wildlife capture programs, passive selenium supplementation, such as with selenium-containing salt blocks, should begin weeks to months before capture to provide adequate time for GSH-Px development.

Reproductive success in female mountain goats

1991 ◽  
Vol 69 (12) ◽  
pp. 2956-2961 ◽  
Author(s):  
James A. Bailey
Keyword(s):  
Reproductive Success ◽  
Observational Studies ◽  
Rocky Mountain ◽  
Individual Characteristics ◽  
Extrinsic Factors ◽  
Oreamnos Americanus ◽  
Intrinsic Factors ◽  
Mountain Goats ◽  
Mountain Goat

Kid production by marked females, age ratios from a 24-year study, and the literature are used to evaluate hypotheses that three intrinsic and three extrinsic factors affect reproduction by female Rocky Mountain goats (Oreamnos americanus). On Sheep Mountain – Gladstone Ridge, Colorado, mountain goat age ratios declined while the herd grew during 1966–1979, and continued to decline with population stability during 1980–1989, suggesting a continued increase in ecological density of goats 39 years after they were introduced in 1950. Among intrinsic factors, age and persisting individual characteristics have influenced reproductive success of females. Reproductive success in any year has not limited success in the following year, except in 4-year-olds. Among extrinsic factors, reproductive success of female mountain goats has been negatively influenced by density or ecological density and by snowpack during gestation. Reproductive success of females may have been positively influenced by snowpack that enhanced forage conditions prior to breeding. The relative importance of these six factors in determining reproductive success of females may vary among and (temporally) within herds. Most hypotheses regarding reproductive success in female mountain goats remain poorly tested. Short-term observational studies hold little promise for testing hypotheses, owing to large among-years variation in reproductive success. Long-term, intensive observational studies, or manipulative experiments, are suggested.

scholarly journals Natural salt licks as a part of the ecology of the mountain goat

1971 ◽  
Vol 49 (5) ◽  
pp. 605-610 ◽  
Author(s):  
Daryl Hebert ◽  
I. McTaggart Cowan
Keyword(s):  
Sodium Intake ◽  
Rocky Mountain ◽  
Dry Weight ◽  
Sodium Content ◽  
Early Summer ◽  
Oreamnos Americanus ◽  
Low Sodium ◽  
Mountain Goats ◽  
Mountain Goat ◽  
Trench Area

Mountain goats (Oreamnos americanus) occupying the Rocky Mountain Trench area of southeastern British Columbia use natural earth licks in the spring (males) and early summer (females). Analysis of range vegetation reveals a low sodium content (mean about 0.004% dry weight). Despite low sodium intake from feed, blood sodium values were normal (m = 150.8 meq/liter). Loss of sodium via the fecal route increases abruptly in the spring. This period of increased loss corresponds with the lime of use of the natural licks. Mineral constituents of the licks were Ca (1050–85 000 ppm), P (0–25 ppm), and Na (115–5500 ppm). Each animal visited the lick but once during the summer and did so despite increased exposure to hazards of predation. Despite the low soil sodium content the inference is that the goats are eating the earth to compensate for Na deficiency.

scholarly journals Brucellosis in Captive Rocky Mountain Bighorn Sheep (Ovis canadensis) Caused by Brucella abortus Biovar 4

2004 ◽  
Vol 40 (2) ◽  
pp. 311-315 ◽  
Author(s):  
Terry J. Kreeger ◽  
Walter E. Cook ◽  
William H. Edwards ◽  
Todd Cornish
Keyword(s):  
Brucella Abortus ◽  
Rocky Mountain ◽  
Bighorn Sheep ◽  
Ovis Canadensis

scholarly journals Differences in leukocyte differentiation molecule abundances on domestic sheep (Ovis aries) and bighorn sheep (Ovis canadensis) neutrophils identified by flow cytometry

2016 ◽  
Vol 46 ◽  
pp. 40-46 ◽  
Author(s):  
Margaret A. Highland ◽  
David A. Schneider ◽  
Stephen N. White ◽  
Sally A. Madsen-Bouterse ◽  
Donald P. Knowles ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Ovis Aries ◽  
Domestic Sheep

Ecological correlates of pneumonia epizootics in bighorn sheep herds

2001 ◽  
Vol 79 (8) ◽  
pp. 1423-1432 ◽  
Author(s):  
Ryan J Monello ◽  
Dennis L Murray ◽  
E Frances Cassirer
Keyword(s):  
Horizontal Transmission ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Domestic Sheep ◽  
Population Declines ◽  
Density Dependent ◽  
Temperature Regimes ◽  
Reservoir Hosts ◽  
The Relationship ◽  
Population Numbers

Bighorn sheep (Ovis canadensis) populations commonly experience pneumonia outbreaks caused by Pasteurella spp. that result in a partial or complete dieoff. Although several factors can contribute to Pasteurella spp. transmission or infectivity in bighorn sheep, to date the importance of such factors in population declines has not been rigorously examined. We evaluated the relationship between pneumonia-induced dieoffs in bighorn sheep and environmental and biological factors by analyzing demographic information for 99 herds across the species' geographic range. Our analysis revealed that 88% of pneumonia-induced dieoffs occurred at or within 3 years of peak population numbers, which implies that density-dependent forces such as food shortage or stress contribute to bighorns' susceptibility to pneumonia. There were few differences in the growth rates of dieoff and non-dieoff populations, suggesting that pneumonia did not manifest itself demographically prior to an outbreak. On average, abundance of lambs was most dramatically reduced post outbreak (–66%) relative to that of either rams (–35%) or ewes (–42%). Deviations in normal precipitation and temperature regimes were not associated with the onset of pneumonia outbreaks, but herds found in proximity to domestic sheep tended to be more susceptible to dieoff. Our results suggest that bighorn sheep herds are rendered vulnerable to pneumonia principally through density-dependent factors, as well as through horizontal transmission of Pasteurella spp. from domestic sheep serving as reservoir hosts.

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