Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.220.221AliIntizar MirzaRiaz Hussain NasirAzam Ali 1199921Data concerning productive and reproductive traits, was collected from 1985-91 and analyzed. The analysis, for local born Jersey and imported Jersey cows, revealed that the, age at first calving average 771.48 ±7.88 and 800.51 ±8.48 days, services per conception were 1.83 ±0.069 and 1.88 ±0.072, services period was 100.99 ±4.63 and 107.03 ±2.77 days, gestation period was observed to be 279.26 ±0.51 and 277.49 ±0.36 days and was longer in cows carrying male calves than those carrying female calves; calving interval averaged 380.93 ±6.36 and 387.18 ±0.3 days, local jersey cows showing shorter calving interval than imported jersey but non-significant, 305-days milk production average 2194.52 ±57.24 and 3150.48 ±46.18 litters, showing that local born Jersey group produced less milk than their imported dams and results were highly significant, dry period was found to be 157.91 ±9.70 and 133.30 ±5.77 days respectively. Whereas the effect of season of birth on age at first calving was found to be non significant.]]>Andersen, H. and E. Nielsen,19681968Anonymous,19971997Bozo, S.,198444367369Duncan, D.B.,195511142Gurra, D. and A. Menendez,198318162163Duncan, D.B.,195511142Ponce de Leon, R. and M. Gomez,198822915Roy, T.C., B.G. Katpatal and M. Kumar,198764301308Slabkina, A.I. and T.A. Denisova,19861473842Steel, R.G.D. and J.H. Torrie,19822nd Edn., 3rd Printing,Pages: 633Pages: 633