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Effects of high altitude and season on fasting heat production in the yak Bos grunniens or Poephagus grunniens

Published online by Cambridge University Press:  09 March 2007

Xing-Tai Han ,
Ao-Yun Xie ,
Xi-Chao Bi ,
Shu-Jie Liu  and
Ling-Hao Hu
Xing-Tai Han*
Affiliation:
Institute of Animal Science, Qinghai Academy of Animal and Veterinary Sciences, 810003, Xining, Qinghai, China
Ao-Yun Xie
Affiliation:
Institute of Animal Science, Qinghai Academy of Animal and Veterinary Sciences, 810003, Xining, Qinghai, China
Xi-Chao Bi
Affiliation:
Institute of Animal Science, Qinghai Academy of Animal and Veterinary Sciences, 810003, Xining, Qinghai, China
Shu-Jie Liu
Affiliation:
Institute of Animal Science, Qinghai Academy of Animal and Veterinary Sciences, 810003, Xining, Qinghai, China
Ling-Hao Hu
Affiliation:
Institute of Animal Science, Qinghai Academy of Animal and Veterinary Sciences, 810003, Xining, Qinghai, China
*
*Corresponding author: Dr Xing-Tai Han, present address: Instituto di Zootechnica, Facoltà di Agraria, Università Cattolica del Sacro Cuore, 29100, Piacenza, Italy, fax +39 0523 599276, email xingtaihan@yahoo.ca
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Abstract

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Thirty growing yaks Bos grunniens or Poephagus grunniens, 1·0–3·5 years and 50–230kg, from their native altitudes (3000–4000m), were used to study the basal metabolism in this species and to evaluate the effects of high altitude and season on the energy metabolism. Fasting heat production (FHP) was measured at altitudes of 2260, 3250 and 4270m on the Tibetan plateau in both the summer and the winter, after a 90d adaptation period at each experimental site. Gas exchanges of the whole animals were determined continuously for 3d (4–5 times per d, 10–12 min each time) after a 96 h starvation period, using closed-circuit respiratory masks. Increasing altitude at similar ambient temperature (Ta) did not affect (P>0·10) FHP in the summer, but decreased (P<0·05) it at different Ta in the winter. However, the decrease of FHP in the winter was mainly due to the decrease of Ta instead of the increase of altitude. In the summer, the respiratory rate, heart rate and body temperature were unaffected by altitude, except for a decrease (P<0·05) in body temperature at 4270m; in the winter, they were decreased (P<0·05) by increasing altitude. In both seasons, the RER was decreased (P<0·05) by increasing altitude. At all altitudes for all groups, the daily FHP was higher (P<0·05) in the summer (Ta 6–24°C) than in the winter (Ta 0 to -30°C), and the Ta-corrected FHP averaged on 920 kJ/kg body weight0·52 at Ta 8–14°C and on 704 kJ/kg body weight0·52 at Ta -15°C respectively. We conclude that in the yak high altitude has no effect on the energy metabolism, whereas the cold ambient temperature has a significant depressing effect. The results confirm that the yak has an excellent adaptation to both high altitude and extremely cold environments.

Keywords

High altitudeSeasonFasting heat productionYak
Type
Research Article
Information
British Journal of Nutrition , Volume 88 , Issue 2 , August 2002 , pp. 189 - 197
Copyright
Copyright © The Nutrition Society 2002

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