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Urinary Excretion of Purine Derivatives in Fed and Fasted Yaks (Bos gruniens)

Published online by Cambridge University Press:  05 November 2021

R. J. Long ,
X. B. Chen ,
S. K. Dong ,
D. G. Zhang ,
E. R. Ørskov  and
Z.Z. Hu
R. J. Long
Affiliation:
Department of Grassland Science, Gansu Agricultural University, Lanzhou, Gansu 730070, P. R. China Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, United Kingdom
X. B. Chen
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, United Kingdom
S. K. Dong
Affiliation:
Department of Grassland Science, Gansu Agricultural University, Lanzhou, Gansu 730070, P. R. China
D. G. Zhang
Affiliation:
Department of Grassland Science, Gansu Agricultural University, Lanzhou, Gansu 730070, P. R. China
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, United Kingdom
Z.Z. Hu
Affiliation:
Department of Grassland Science, Gansu Agricultural University, Lanzhou, Gansu 730070, P. R. China
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Extract

Previous studies in sheep and cattle have demonstrated that the urinary excretion of purine derivatives (PD) provides an index of the intestinal flow of microbial protein (Chen et al. 1990). Yak is the most important ruminant species in Tibetan Plateau. It was of interest to establish whether the approach of PD excretion to estimate microbial protein supply is applicable in yaks. The objective of this work is to measure the effect of fasting and different levels of feeding on PD excretion in yaks.

The feeding experiments were carried out in Xi-ning, China at an altitude of 3100m and a latitude of 36.8° N. Six 5-year old female yaks were used and 3 experiments were completed.

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 134
Copyright
Copyright © The British Society of Animal Science 1998

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References

Chen, X.B., Ørskov, E.R., Hovell, F.D. DeB. 1990. Excretion of purine derivatives by ruminants: endogenous excretion, difference between cattle and sheep. British Journal of Nutrition 63: 121–129.10.1079/BJN19900097CrossRefGoogle Scholar
Chen, X.B. Samaraweera, L., Kyle, D.J., Ørskov, E.R. and Abeygunawardene, H. (1996). Urinary excretion of purine derivatives and tissue xanthine oxidase activity in buffaloes, with special reference to differences between buffaloes and Bos taurus cattle. British Journal of Nutrition 75: 397–407.10.1079/BJN19960142CrossRefGoogle ScholarPubMed