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Genetic parameters and trends for production traits in jersey island heifers

Published online by Cambridge University Press:  24 November 2017

R.A. Mrode ,
G.J.T. Swanson  and
H.J. Bellamy
R.A. Mrode
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey, KT7 0EL
G.J.T. Swanson
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey, KT7 0EL
H.J. Bellamy
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey, KT7 0EL
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Extract

Lactation records of Jersey cattle on Jersey Island are recorded within National Milk Records of England and Wales (NMR). Since it is a closed breed population, it is not possible to amalgamate these data with Jerseys recorded in the United Kingdom (UK). Presently genetic evaluations of Jersey Island bulls are carried out using heifer records with a modification of the model used in the UK to account for the smaller herd sizes. Cows are not evaluated.

The objective of this study was to analyse Jersey Island data in order to estimate genetic parameters and establish genetic trends after evaluating all bulls and cows using an Individual Animal Model (LAM).

Type
Dairy Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 122
Copyright
Copyright © The British Society of Animal Production 1992

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References

Swanson, G.J.T. and Bellamy, H.J. (1991) Animal model evaluations of Jerseys for production traits in the United Kingdom. British Cattle Breeders Club, Digest No. 46: 2–7.Google Scholar
Visscher, P.M. (1991) Estimation of Genetic parameters in dairy cattle using an animal model and implications for genetic improvement. PhD Thesis, University of Edinburgh.Google Scholar