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There is no evidence of impairment of reproductive function of dairy cows on spring pasture during mating in New Zealand (NZ)

Published online by Cambridge University Press:  22 November 2017

O. R. Madibela ,
A. R. Sykes ,
A. M. Nicol  and
C. M. Logan
O. R. Madibela*
Affiliation:
Lincoln University, Christchurch, New Zealand
A. R. Sykes
Affiliation:
Lincoln University, Christchurch, New Zealand
A. M. Nicol
Affiliation:
Lincoln University, Christchurch, New Zealand
C. M. Logan
Affiliation:
Lincoln University, Christchurch, New Zealand
*
Email:[email protected]
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Extract

Highly degradable protein diets creating high ammonia and/or urea concentrations in blood or reproductive fluids may affect reproductive performance by their toxicity to embryos (Hammon et al. 2005). Pastures in NZ during spring have high CP (170 to 273 g/kg DM) and cows on these pastures have high blood urea (36 mg/dl; Moller et al. 1993). Few studies (Ordonez et al. 2007) have evaluated association between high blood urea and reproduction of individual cows. The present study examined individual cow reproductive performance and blood urea concentration during grazing of spring pasture.

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2008 , 2008 , pp. 4
Copyright
Copyright © The British Society of Animal Science 2008

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References

Ferguson, J.D., Galligan, D.T., Blanchard, T and Reeves, M. 1993. Journal of Dairy Science. 76, 3742–3746 Google Scholar
Hammon, D.S., Holyoak, G.R. and Dhimann, T.R. 2005. Animal Reproduction Science. 86, 195–204 Google Scholar
Moller, S., Matthew, C. and Wilson, G.F. 1993. Proceedings of the New Zealand Society of Animal Production. 53, 83–86 Google Scholar
Ordonez, A., Parkinson, T.J., Matthew, C., Holmes, C.W., Miller, R.D., Lopez-Villalobos, N., Burke, J. and Brookes, I. 2007. New Zealand Veterinary Journal. 55, 69–76 Google Scholar