Records of first calving age and total milk yield in the first lactation of Local Indian Dairy (Zebu) and Holstein Friesian purebred cows and the various crosses between them from a single farm was studied. Heterosis in the F^ generation was 27.60 % for milk yield and -7.86 % for first calving age. Milk yield dropped by 3 8 . 9 ^ from F^ to F generations based on unadjusted data. When least square estimates for both the traits were regressed on proportion of Holstein Friesian level of inheritance , a curvilinear equation best fitted the relationship. Both traits improved with increasing Holstein Friesian inheritance in the crosses up to 77 % and declined beyond this level . Based on a marginal analysis, the optimum range of Holstein Friesian inheritance was between 58 % and 77%

S. Sivarajasingam, A. R Kumar

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 529–534, 1986
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