Effect of various doses of injected selenium on performance and physiological responses of sheep to heat load

Alhidary, I. A., Shini, S., Al Jassim, R. A. M. and Gaughan, J. B. (2012) Effect of various doses of injected selenium on performance and physiological responses of sheep to heat load. Journal of Animal Science, 90 9: 2988-2994. doi:10.2527/jas2011-4908


Author Alhidary, I. A.
Shini, S.
Al Jassim, R. A. M.
Gaughan, J. B.
Title Effect of various doses of injected selenium on performance and physiological responses of sheep to heat load
Journal name Journal of Animal Science   Check publisher's open access policy
ISSN 0021-8812
1525-3163
Publication date 2012-09
Sub-type Article (original research)
DOI 10.2527/jas2011-4908
Open Access Status
Volume 90
Issue 9
Start page 2988
End page 2994
Total pages 7
Place of publication Savoy, IL United States
Publisher American Society of Animal Science
Collection year 2013
Language eng
Formatted abstract
The aim of the study was to determine the effects of various doses of injected Se on the physiological responses of sheep to heat load. Fifteen 9-moold Australian Merino wethers (mean BW = 27.2 ± 2.1 kg) were randomly assigned to 1 of 3 treatments: 0 (control), 0.5, and 5 mg of Se, which was administered as a subcutaneous sodium selenate injection (5 mg/mL Se) on d 1, 8, and 15 of exposure to heat stress. The animals were housed individually in an environmental chamber and exposed to high temperature from 0700 to 1800 h (maximum = 38°C; minimum = 24°C) and to thermoneutral temperature from 1800 to 0700 h (maximum = 24°C; minimum = 20°C) for 21 d. Rectal temperature (RT) and respiration rate (RR) were measured daily at
0800, 1200, and 1600 h. Feed intake was measured daily, and sheep were weighed on d 1, 8, 15, and 21. Blood samples were collected on d 1 and 21. The 5 mg Se treatment decreased RT by 0.3°C (P = 0.02) and BW loss by 4.5% (P < 0.05) and increased eosinophil count (P <0.05). There were no differences (P > 0.05) between
treatments in RR and DMI, serum concentrations of glucose, total protein, cholesterol, and NEFA or in blood hematology variables. The fi ndings of this study have
important implications for the sheep industry. Further studies are warranted to elucidate the dynamics of Se on productivity and health during hot conditions.
Keyword Heat load
Merino sheep
Physiological Response
Selenium
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2013 Collection
 
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