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Pakistan Journal of Biological Sciences

Year: 2001 | Volume: 4 | Issue: 11 | Page No.: 1421-1424
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ABSTRACT

The study was designed to evaluate the suitable genotype for increasing milk yield with satisfactory reproductive performance in local environmental and managemental conditions. Data from a local private dairy farm on milk yield and different reproductive traits of cows were made available in this study to evaluate the effects of different genotypes on lactation length, milk yield, length of dry period, service per conception, gestation length and post-partum heat period. Statistical analysis of the results indicated that milk yield, length of dry period, service per conception and post-partum heat period were significantly affected (P<0.01) by different genotypes. Lactation length and service per conception were also significantly affected (P<0.01) by parity and interaction of genotype x parity. The highest lactation length was observed for the genotype Jersey x Friesian x Local (JxFxL) and the lowest for Local (L) and Jersey x Local (JxL) in the first and second lactation. The highest milk yield was observed for the genotype JxF and JxFxL and lowest for L and JxL. The highest length of dry period was observed in L and lowest for JxL and JxFxL. Maximum services were required for L and JxFxL and lowest for JxL and Sahiwal x Local (SLxL.) The highest gestation length was observed for genotype SLxL and L, while the lowest for JxF and JxL. The highest post-partum heat period was observed for genotype JxL and JxFxL and lowest for L in pooled lactation. The milk yield of all the crossbred cows showed 16 to 58 per cent higher milk yield than indigenous cows (541.26 kg/lactation). The overall reproductive performance of different genotypes so far included in this study were not very different.
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