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Inheritance of some economic characters in Hariana cattle. I. Age at first calving



Inheritance of some economic characters in Hariana cattle. I. Age at first calving



Indian Jour Dairy Sci 14(3): 81-88



Average age at first calving was observed to be 1421.06 [plus or minus] 13.4 days (46.7 months). Heritability of age at first calving by the intrasire regression of daughters on dams was 0.3404 [plus or minus] 0.1216 on 244 pairs of daughters and mates of 24 bulls. Heritability by paternal half-sib correlation was 0.3412 [plus or minus] 0.196 on the above 244 half-sibs, and 0.404 [plus or minus] 0.01818 on 322 half-sibs. There was no significant correlation between age at first calving, peak yield, milk yield and lactation period.

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