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Factors affecting the interval between calving and conception in Hariana cattle

Published online by Cambridge University Press:  02 September 2010

J. S. Dhillon ,
R. M. Acharya ,
M. S. Tiwana  and
S. C. Aggarwal
J. S. Dhillon
Affiliation:
Department of Animal Breeding, Punjab Agricultural University, Hissar, India
R. M. Acharya
Affiliation:
Department of Animal Breeding, Punjab Agricultural University, Hissar, India
M. S. Tiwana
Affiliation:
Department of Animal Breeding, Punjab Agricultural University, Hissar, India
S. C. Aggarwal
Affiliation:
Department of Animal Breeding, Punjab Agricultural University, Hissar, India
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Summary

Eight hundred and ninety-eight records of the interval between calving and conception (service period) of 349 Hariana cows, the progeny of 79 sires, were analysed by fitting constants for the effects of year, month of calving, calving sequence, sex of the calf, weight of the cow at calving and weight of the calf at birth. The average service period was 272·7 days with a coefficient of variability of 50·7%.

The service period was longest after the first calving. Animals calving in the months of February to August had a longer service period than those calving during the months of September to January. Heavier cows tended to have a shorter service period. Sex of the calf, calving sequence and birth weight of the calf did not affect this trait significantly.

Heritability of service period estimated from the paternal half-sib correlation using repeated records was 0·06 ± 0·018 and repeatability was 0·250 ± 0·039. It seems likely therefore that a shortening of the service period may not be possible through direct selection.

Type
Research Article
Information
Animal Production , Volume 12 , Issue 1 , February 1970 , pp. 81 - 87
Copyright
Copyright © British Society of Animal Science 1970

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References

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