Productive and reproductive efficiency of imported and local born jersey breed of cattle in the subtropical environment of Pakistan
1999
Ali, I. | Mirza, R.H. | Nasir, A.A. (Research Inst. for Physiology of Animal Reproduction, Kasur (Pakistan))
Data 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 plus minus 7.88 and 800.51 plus minus 8.48 days, services per conception were 1.83 plus minus 0.069 and 1.88 plus minus 0.072, services period was 100.99 plus minus 4.63 and 107.03 plus minus 2.77 days, gestation period was observed to be 279.26 plus minus 0.51 and 277.49 plus minus 0.36 days and was longer in cows carrying male calves than those carrying female calves; calving interval averaged 380.93 plus minus 6.36 and 387.18 plus minus 0.3 days, local jersey cows showing shorter calving interval than imported jersey but non-significant, 305-days milk production average 2194.52 plus minus 57.24 and 3150.48 plus minus 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 plus minus 9.70 and 133.30 plus minus 5.77 days respectively. Whereas the effect of season of birth on age at first calving was found to be non significant.
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