Abstract
Data on the performance records of 582 Nili-Ravi buffaloes kept at the Livestock Experiment Station, Bahadurnagar, Okara for the years 1934-85were analysed to estimate repeatability of some reproductive traits. Based on 2797 records of 582 buffaloes, the average postpartum oestrous interval (PPOI) was 176.73 ± 2.71 days. The insemination period (IP), service period (SP) and calving interval (CI) averaged 37.75 ± 1.98,216.94 ± 3.17 and 520.26 ± 3.93 days, respectively. The repeatability of PPOI was estimated to be 0.05 ± 0.02. The repeatability estimates for IP, SP and CI were 0.08 ± 0.02, 0.10 ± 0.02 and 0.12 ± 0.02, respectively. The low estimates or repeatability for these reproductive traits suggested that most of the observed variation in these traits was mainly due to temporary environmental conditions. Thus, the use of multiple records is emphasized in the selection of dairy animals for these traits.
