Postpartum ovarian activity,uterine involution and fertility in indigenous buffaloes at a selected village location in Sri Lanka |
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| Affiliation: | 1. College of Animal Science and Technology, China Agricultural University, Beijing, China;2. Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan;3. The Institute of Animal Husbandry and Veterinary Science, Beijing Academy of Agriculture and Forestry, Beijing, China;4. The Research Center for Animal Science, Hiroshima University, Higashi-Hiroshima, Japan;1. Department of Veterinary Medicine, Federal University of Uberlandia (UFU), Uberlandia, MG, Brazil;2. Department of Veterinary Medicine, University of Brasilia (UnB), Brasilia, DF, Brazil;3. Embrapa Genetic Resources and Biotechnology (CENARGEN), Brasilia, DF, Brazil;1. ICAR-Indian Veterinary Research Institute, Uttar Pradesh 243122, India;2. ICAR-Central Institute for Research on Buffaloes, Haryana 125001, India;1. State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China;2. College of Animal Science and Technology, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region, 530005, PR China;3. Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK;4. Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu Province, 225009, PR China;1. Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium;2. Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820, Merelbeke, Belgium |
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| Abstract: | Reproductive events were monitored over a period of 30 months in a sample of 55 indigenous (Lanka) buffalo cows belonging to five farmers selected at random in a specific village in the dry zone low-country region of Sri Lanka. The animals were maintained under the existing traditional methods of extensive grazing management and low-intensity utilization for milk and draught power in a crop-livestock system. Annual calving rate was 87.2%, with 82.4% of all calvings occurring between December and March (peak calving season). Involution of the uterus, based on rectal palpation, was completed at an interval of (mean ± SD) 32.9 ± 8.2 days post-partum. The majority (70.8%) of first services postpartum were recorded between February and April. The interval from calving to first service was 57.3±49.2 days for 80 animals which calved during the peak calving season and 156.2 ± 95.6 days for eight animals calving outside the peak season (overall 66.4 ± 61.4 days, n = 88). The intervals to uterine involution and first service were correlated (r=0.53, P < 0.01) and both were significantly influenced by month of calving, but not by age or parity of the cow. The interval from calving to palpation of the first corpus luteum was 52.3 ± 16.8 days, and to the first elevation of progesterone above 0.5 ng/ml of fat-free milk was 54.9 ± 17.9 days.Of the 36 cases where complete progesterone profiles and clinical data were available, first services were recorded in 27 (75%) before palpation of a corpus luteum or elevation of progesterone after calving, and conception to this service was confirmed in 24 (88.9%). Elevation of progesterone preceded first service in seven (19%); the resultant luteal phases were short in four and normal in three. Overall conception rate to first service was 77.7% and the number of services per conception was 1.29. The calving to conception intervals ranged from 23 to 502 days (mean 71.5 ± 66.2, mode 41–60, n = 82) and the calving intervals from 329 to 816 days (mean 384.9 ± 62.9, mode 351–370, n=79).These findings confirm that Lanka buffaloes are capable of maintaining high fertility under certain traditional systems of management. The major cause of long calving intervals was prolonged postpartum acyclicity, which occurred mainly in animals calving outside the peak calving season. |
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