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Relationship between plasma ammonia and the urea concentration of milk and plasma in the lactating dairy cow

Published online by Cambridge University Press:  20 November 2017

H. J. Biggadike ,
R.D. Allison ,
R.A. Laven ,
C.A. Collins ,
S.B. Drew  and
R.J. Mansbridge
H. J. Biggadike
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
R.D. Allison
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
R.A. Laven
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
C.A. Collins
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
S.B. Drew
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
R.J. Mansbridge
Affiliation:
ADAS Bridgets Dairy Research Centre, Martyr Worthy, Winchester, Hampshire S021 1AP, UK
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Extract

The objective of this study, which formed part of a larger project, was to investigate the effect of feeding high levels of urea on the reproductive function of the lactating dairy cow. Increasing dietary protein intake can increase milk production, but may reduce reproductive performance (Laven and Drew 1999). McEvoy et al (1997), based on work which fed urea to sheep, suggested that this effect on fertility may be caused by ammonia. However, there is little information on the effect of feeding quickly degradable nitrogen (QDN) on the concentration of plasma ammonia in the dairy cow and the accurate measurement of plasma ammonia is difficult. The measurement of a more stable metabolite, such as urea, may be more useful, if it can be shown to be correlated with plasma ammonia.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2000 , 2000 , pp. 146
Copyright
Copyright © The British Society of Animal Science 2000

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References

Laven, R.A. and Drew, S.B. (1999) Dietary Protein and Reproductive Performance of the Cow: A Review of the Effects and mechanisms. Veterinary Record (in press)Google Scholar
McEvoy, T.G., Robinson, J.J., Aitken, R.P., Findlay, P.A., and Robertson, I.S. (1997) Dietary excesses of urea influence the viability of preimplantation embryos and may affect fetal growth among survivors. Anim. Rep. Sci. 47: 71–90 Google Scholar