Data on 3438 breeding records of 1062 Sahiwal cows maintained during 1963- 87 were analysed to estimate various parameters of reproductive efficiency. The age at first service ami that at first calving averaged 912.55 ± 5.79 and 1242.49 ± 5.85 days, respectively and were significantly affected by the year of birth. Calving interval averaged 428.88 ± 1.71 days. The autumn calvers had relatively shorter calving interval than cows calving in other seasons. Conception rate expressed as the total number of cows conceived as percentage of total services performed averaged 48.27%. Calving rate calculated as the percentage of cows calved out of the total number of cows mated during the period under study averaged 86.23%. The breeding efficiency averaged 86.36 ± 0.44% and varied form 45 to 119%
Muhabbat Khan, Zaheer Ahmad, Muhammad Sajjad Khan. (1992) ANALYSIS AND INTERPRETATION OF BREEDING RECORDS OF A SAHIWAL HERD FOR REPRODUCTIVE PERFORMANCE, , Volume 29, Issue 2.
