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A note on the relationship between milk yield and reproductive performance in some British Friesian sire progeny groups

Published online by Cambridge University Press:  02 September 2010

P. D. P. Wood  and
J. P. Frappell
P. D. P. Wood
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey KT7 0EL
J. P. Frappell
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey KT7 0EL
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Abstract

The 305-day lactation milk yields and the numbers of inseminations required to obtain a pregnancy during a particular lactation were obtained from 1475 lactations of 808 daughters of eight bulls, whose Improved Contemporary Comparisons spanned two genetic standard deviations of milk yield. All lactations were completed before September 1978. Cattle requiring more than one insemination for a pregnancy produced 173 (standard error of difference = 55) kg more milk in 305 days than those requiring only one. There was no correlation between the Improved Contemporary Comparisons of the sire and either the difference in yield, or the proportion of animals needing one or those needing more than one insemination per pregnancy.

Type
Research Article
Information
Animal Production , Volume 34 , Issue 2 , April 1982 , pp. 239 - 241
Copyright
Copyright © British Society of Animal Science 1982

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References

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