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Journal of Dairy Science Vol. 48 No. 11 1498-1505
© 1965 by American Dairy Science Association ®
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Evaluation of Breeding Value of Bulls Used in Two Herds in India

D. Sundaresan1, M. Gurnani and S. P. Sidhu

National Dairy Research Institute, Karnal, India

ABSTRACT

Sire indices on milk production and maturity on 30 Tharparkar and 18 Sahiwal bulls used in the two respective herds were calculated by five methods: two involving daughter-dam comparisons, one with daughter's production only, and two using contemporary averages.

A sire index to be valuable is expected to be accurate. Accuracy was measured by repeatability of the test, i.e., whether a bull evaluated by a sample of daughters maintained a similar index or ranking when he was further evaluated by information from more daughters, thus approximating the magnitude of the correlation between the sire index and the true breeding value of the bull. The fifth method used,
Figure 2
: k = 12 or 6, was found to be more accurate in estimating the breeding value of a bull under Indian conditions.

FOOTNOTES

1 Present address: Dean, Post-Graduate Studies, Punjab Agricultural University, Ludhiana, India.






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