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The effect of gestation stage on daily milk and components yield of dairy cattle

Published online by Cambridge University Press:  05 November 2021

V.E. Olori ,
S. Brotherstone ,
B.J. McGuirk  and
W.G. Hill
V.E. Olori
Affiliation:
Institute of Cell Animal and Population Biology, University of Edinburgh, Edinburgh, EH9 3JT
S. Brotherstone
Affiliation:
Institute of Cell Animal and Population Biology, University of Edinburgh, Edinburgh, EH9 3JT
B.J. McGuirk
Affiliation:
Genus Ltd., Bays Leap Farm, Heddon-on-the-Wall, Newcastle-upon-Tyne, NE15 0JW
W.G. Hill
Affiliation:
Institute of Cell Animal and Population Biology, University of Edinburgh, Edinburgh, EH9 3JT
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Extract

The effect of pregnancy on milk yield and composition has long been recognised (Erb, 1952), yet it is not currently directly accounted for in genetic evaluations. In the UK, total lactation yields are adjusted for the effect of calving interval (CI) with adjustment factors (Brotherstone, 1987) which assume a constant effect across gestation stage (GS). The effect of pregnancy however varies with gestation stage (Coulon, 1995) and is different from the effect of CI. In genetic evaluation based on test day models, it is essential to account for the direct effect of pregnancy specific to individual records. The objective of this study was to estimate the effect of gestation stage on daily milk yield and its components in first lactation.

Type
Programme
Information
Proceedings of the British Society of Animal Science , Volume 1997 , 1997 , pp. 142
Copyright
Copyright © British Society of Animal Science 1997

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References

Brotherstone, S. (1987) A note on the value and methods of correcting milk records for calving interval or days dry. Animal Production 44: 322–325.Google Scholar
Coulon, J.B. Perochon, L. and Lescourret, F. (1995) Modelling the effect of the stage of pregnancy on dairy cow's milk yield. Animal Science 60: 401–408 CrossRefGoogle Scholar
Erb, R.E. , Goodwin, M.M., Morrison, R. A. and Shaw, A.O. (1952) Lactation studies. 1. Effect of gestation. Journal of Dairy Science 35: 224–233.CrossRefGoogle Scholar