Environmental influence on calving interval and estimates of its repeatability in the Murrah buffalo in Sri Lanka |
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| Authors: | K Lundström H Abeygunawardena LNA De Silva BMAO Perera |
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| Institution: | 1. Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-750 07 Uppsala Sweden;2. Department of Veterinary Clinical Studies, University of Peradeniya, Peradeniya Sri Lanka |
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| Abstract: | Data on 2375 calvings in 726 Murrah buffalo cows were analysed for the period 1968 to 1979 on two state farms (Ridiyagama and Polonnaruwa) in the dry zone of Sri Lanka. The mean ages at first calving were 51.0 (S.D. 8.6) and 52.1 (S.D. 10.5) months, the calving intervals 530.6 (S.D. 168.2) and 538.6 (S.D. 166.7) days, and the repeatabilities of calving intervals 0.36 ± 0.02 and 0.43 ± 0.02 for the two farms, respectively. The calving interval was significantly influenced (P ? 0.01) by the individual cow, year and season of conception, and parity. Conception during January to March led to the shortest calving interval, and during October to December to the longest. The highest percentage of conceptions occurred some 2–5 months after the peak rainfall. |
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