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The effect of environment and heredity on lactation III. Butterfat percentage

Published online by Cambridge University Press:  27 March 2009

P. Mahadevan
P. Mahadevan
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
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Extract

1. On the basis of 5000 records from twelve leading herds of Ayrshire cattle in south-west Scotland for the period 1930–9, a statistical study has been made of some of the causes of variations which occur in butterfat percentage.

2. Butterfat percentage was found to be affected only very slightly by month of calving, age and length of calving intervals.

3. Selection for milk yield would not affect butterfat percentage adversely to any appreciable extent.

4. The average repeatability of butterfat percentage was 0·691 in the present material, and heritability was of the order of 0·50–0·60.

5. Mass selection would be an effective tool in bringing about improvement in butterfat percentage.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 41 , Issue 1-2 , January 1951 , pp. 94 - 97
Copyright
Copyright © Cambridge University Press 1951

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References

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