Season of birth and age at sexual maturity had a non-significant effect on first lactation milk yield. The overall least-squares mean lactation milk yield was 2154.07 ± 16.88 L. Significant effect of batch was found on first lactation milk yield in the present study. Cows belonging to 4th batch recorded significantly (P<0.0) higher lactation milk yield of 2475.93 ± 19.65 L. The effects of season of birth and age at sexual maturity were found to have no-significant effect on lactation length. The overall least-squares mean value for lactation length was 300.16 ± 0.06 days.
Key words: Progeny Testing Programme, lactation milk yield, peak yield, age at sexual Maturity.
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