Department of Animal Breeding, CCS Haryana Agricultural University, Hissar-125 004, Haryana
Data on 151 Nali ewes born during 1978 to 1998 were analysed to assess effect of year and season of birth, dam's age group at lambing and regression of dam's weight at lambing on age at first service (AFS), weight at first service (WFS), age at first lambing (AFL), weight at first lambing (WFL) and inter lambing interval (ILI). The least squares means were 775.83±12.94 days, 24.92±0.22 kg, 925.08±13.02 days, 24.46±0.kg and 351.79±2.56 days for AFS, WFS, AFL, WFL and ILI, respectively. Year of birth of lamb had non significant effect on all the reproduction traits. The effect of season of birth was found significant (P<0.05) on AFS and AFL, whereas non significant on WFS, WFL and ILI. Autumn born lambs attained earlier age at first service than spring born lambs (713.64 ±55.53 vs 791.21±17.72 days). The effect of age group of dams and regression of dam's d weight at lambing were found non significan1 on all reproduction traits.
Nali, Non-genetic factors, Reproduction, Sheep
