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Genotype by environment interaction for milk, fat and protein yield in Holstein Friesian dairy cattle in Ireland

Published online by Cambridge University Press:  05 November 2021

A. R Cromie ,
D.L Kelleher ,
F.J Gordon  and
M. Rath
A. R Cromie
Affiliation:
University College Dublin, Dept. of Animal Science and Production, Faculty of Agriculture, Dublin 4, Ireland Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, Northern Ireland
D.L Kelleher
Affiliation:
University College Dublin, Dept. of Animal Science and Production, Faculty of Agriculture, Dublin 4, Ireland
F.J Gordon
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, Northern Ireland
M. Rath
Affiliation:
University College Dublin, Dept. of Animal Science and Production, Faculty of Agriculture, Dublin 4, Ireland
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Extract

The existence of genotype by environment interaction (G*E) can cause a change in the ranking of bulls tested in one environment when their daughters are subsequently milked in another environment. If the degree of re-ranking is large, the genetic correlation between milk production in the two environments will be substantially less than 1.0, with the implication that proofs made in one environment may not be reliable predictors of proofs in the second environment. The aim of this study was to investigate the effect of increasing the difference between environments, defined on the basis of herd average milk yield, on the genetic correlation (rg) for milk, fat and protein yield in Holstein Friesian dairy cattle in Ireland.

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Programme
Information
Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 52
Copyright
Copyright © The British Society of Animal Science 1998

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References

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