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A note on detection of oestrus in cattle bred by artificial insemination, and the measurement of embryonic mortality

Published online by Cambridge University Press:  02 September 2010

P. D. P. Wood
P. D. P. Wood
Affiliation:
Milk Marketing Board, Thames Ditton, Surrey
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Summary

Insemination and calving dates were obtained for 2618 British Friesian cows served twice by artificial insemination, the first time unsuccessfully, the second time successfully. The intervals between the two inseminations formed a multi-modal set of normal distributions with peaks at 21-day cycles. The standard deviation of the Kth distribution was 3·0y/K days, with about 58·5% of eligible animals submitted at each cycle. Nearly 84% of all intervals conformed to the normal distributions, suggesting that embryonic mortality occurred in about 16% of cases following the first oestrus after insemination.

Type
Research Article
Information
Animal Production , Volume 22 , Issue 2 , April 1976 , pp. 275 - 278
Copyright
Copyright © British Society of Animal Science 1976

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References

REFERENCES

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