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The duration of pedigree herds in three breeds of cattle in relation to selective breeding.

Published online by Cambridge University Press:  27 March 2009

H. P. Donald  and
A. A. El Itkiby
H. P. Donald
Affiliation:
Institute of Animal Genetics, University of Edinburgh
A. A. El Itkiby
Affiliation:
Institute of Animal Genetics, University of Edinburgh
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Extract

In the breeding of animals like cattle which reproduce slowly relative to the working life of a breeder, time is a factor of major importance. A study has therefore been made of the duration of samples of pedigree herds in order to obtain some indication of the time actually spent by breeders in the selective breeding of dairy cattle.

The samples consisted of pedigree Ayrshire, Jersey and Shorthorn herds, (a) established at various fixed times in the past; and (b) existing in 1939. The former were traced forwards, and the latter backwards, by means of herdbook registrations. Each sample contained not less than 300 herds, and the distribution of durations in each was considered in relation to the movement of population numbers in the whole breeds from which they were drawn.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 36 , Issue 2 , April 1946 , pp. 100 - 110
Copyright
Copyright © Cambridge University Press 1946

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References

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