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The effect of level of environment on sex differences in pre-weaning growth rate in beef cattle

Published online by Cambridge University Press:  02 September 2010

I. R. Hopkins
I. R. Hopkins
Affiliation:
School of Wool and Pastoral Sciences, University of New South Wales, PO Box 1, Kensington, New South Wales 2033, Australia
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Summary

Using pre-weaning records of 3822 calves from 11 Victorian herds, mean male and female growth rates and corresponding sex differences were calculated for each dam age and herd-year class. From these means simple regression equations relating sex differences and growth rates were calculated. There was a close similarity between equations based on dam age means and those based on herd-year means while correlations between sex differences and male growth rates were high.

These results showed that sex differences and female growth rates could be predicted reliably from the level of environment as measured by male growth rate. Sex differences predicted by these regression relationships differed markedly from those predicted by the simple multiplicative and simple additive models generally used in adjusting for sex differences in selection.

The results also suggested that other differences such as breed differences may be predictable in the same way and that such differences are determined primarily by the level of environment per se rather than differences in the nature of the components contributing to that level.

Type
Research Article
Information
Animal Production , Volume 25 , Issue 1 , August 1977 , pp. 47 - 51
Copyright
Copyright © British Society of Animal Science 1977

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References

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