For maximizing genetic gain by selection it Is important to evaluate breeding value of bull on the baeie of ite pedigree and progeny Information with accuracy as high us possible, when information on very large number of daughters of bull ie available, the role of pedigree in improving the accuracy of estimation of bu ll's breeding value would be negligibly small. On the other hand i f the Information on small number of b u ll's progeny le available, aa is generally the situation in most of organized farms in India, Incorporating information on pedigree can be useful in Increasing accuracy of evaluation of breeding value of Gulls. The afficacy of theoretical assessment of evaluation of breeding value of bulls, by using the daughters' records, records on bu ll's dam and paternal half sibs, by the formulae given by Young (1961) ie subject to validity of several assumptions. The estimates of hsritability and repeatability are assumed to be unbiased. Further hsritability of firet and subsequent lactation records is assumed to be same. Thirdly repeatability of lactation milk production is assumed to be same for various lactation records. In actual situations, such assumptions may not hold true leading to larger differences in expected and observed genetic changes. It was, therefore, considered useful to evaluate the relative ueightage that should be given to various amounts of information to b u ll's daughters, dam and paternal half-sisters in evaluation of breeding value of bull by multiple regression method.

A. K Arya, M. Gurnani

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 96–99, 1982
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