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Selection in dual purpose cattle populations: defining the breeding objective

Published online by Cambridge University Press:  02 September 2010

A. E. McClintock  and
E. P. Cunningham
A. E. McClintock
Affiliation:
The Agricultural Institute, Dunsinea, Castleknock, Co. Dublin, Ireland
E. P. Cunningham
Affiliation:
The Agricultural Institute, Dunsinea, Castleknock, Co. Dublin, Ireland
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Summary

The selection objective in choosing dual-purpose bulls for use in artificial insemination should be the economic benefit conferred on the population with each insemination. The value of a unit of genetic superiority in the bull for a beef or a dairy trait, as realized through one insemination, depends on two factors—the economic value per unit of superiority and the number of times that superiority is expressed. The economic values are easily established. A standard unit of expression for a trait is defined to be one progeny expression in the year in which the insemination is carried out. A method is developed for summarizing the total genetic consequences of an insemination in these standard units. It takes account of the timing of the insemination, the number of years over which the evaluation is carried out, a discount factor, the dilution of the bull's genotype in his descendants, the female replacement rate, the calf survival rate, and the probability that a surviving calf becomes a dairy cow. The method is independent of the full testing procedures, the intensity of selection, and the level of bull usage. It applies, equally, to selection of bulls for general use and for use in planned matings to produce young sires for testing.

Type
Research Article
Information
Animal Production , Volume 18 , Issue 3 , June 1974 , pp. 237 - 247
Copyright
Copyright © British Society of Animal Science 1974

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References

REFERENCES

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