Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.207.208AliIntizar NasirAzim Ali MirzaRiaz Hussain 1199921Productive and reproductive traits data was collected from 1985-91 and analyzed. For local born and imported Holstein Frielan cows revealed that the age at first calving average 787.38±13.61 and 822.46±10.63 days, services per conception were 1.76±0.10 and 1.87±0.089, services period was 161.48±14.45 and 132.92±5.11 days. Gestation period was observed to be 278.65±0.78 and 279.92±0.63 days and was longer in cows carrying male calves than those carrying female calves; calving interval average 443.77±18.67 and 415.66±5.09 days, 305 days milk production average 3543.23±121.26 and 4114.40±115.96 litters, showing that local born group produced less milk than their imported dams, dry period was found to be 192.71±18.14 and 191.07±13.11 days respectively.]]>Alim, K.A., 1985213338Andersen, H. and E. Nielsen,19681968Anonymous,19971997Anonymous,19971997Boujenane, I. and M. Ba,198639145149, (In French)Bozo, S.,198444367369Bozo, S., J. Dohy, A. Dunay and K. Rada,197524347357Caput, P., M. Uremovic and D. Frleta,198539381385Duncan, D.B.,195511142Fernandez, M., R. Ronda and C. Perez,19791135144Guerra, D. and A. Menendez,198318162163Mangurkar, B.R., S.B. Gokhale, D.N. Shindey, A.B. Panda and Y.P. Phadnis,198555893897Ponce de Leon, R. and M. Gomez,198822915Steel, R.D.G. and J.H. Torrie,1982