573 animals comprising of two Indian zebu breeds,three exotic breeds and their two crossbred strains were screened by 'sex chromatin test' for the drumstick frequency which normally ranged from zero to seven or sometimes more per two hundred polymorphonuclear ‘leucocytes in their blood smears. About fifty percent animals were almost equally divided among zero or one drumstick frequency groups, the rest were found to be distributed among other groups. The proportion of the animals reaching the lactation stage vs/vs failing(Performance Vs Non-performance) among all the breed/genetic groups was observed to be significantly lower among the zero and one drumstick frequency groups as compared to the other groups, where it was opposite. The animals among the zero drumstick frequency group showed a higher age at fist calving (about 3 months).produced lower milk yield in their first lactation (about 560 lit) and stayed in the herd only for 2 lactations at the most. The differences for milk production and number of calvings were observed to be statistically significant.

V. Shanker, S. Bhatia

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 139–144, 1986
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