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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 1999;12(7): 1019-1024.
https://doi.org/10.5713/ajas.1999.1019    Published online November 1, 1999.
Study on Factors Leading to Seasonality of Reproduction in Dairy Buffaloes I. Nutritional Factors
M. S. Qureshi, H. A. Samad, G. Habib, R. H. Usmani, M. M Siddiqui
Fifth one Nili-Ravi dairy buffaloes were studied in North-west Frontier Province of Pakistan. Rectal examinationof reproductive organs was carried out on days 14 and 21 and then fortnightly. Milk samples were collected and analyzed for progesterone levels (MPL). Feed samples were collected fornightly and analyzed. The buffaloes calving during the normal breeding season (NBS, August toJanuary) (p<0.01) postpartum estrus interval of 55.95 days versus 91.15 days in those calving during the low breeding season (LBS, February to July). MPL in the LBS remained lower than the NBS (p<0.01). Shortest postpartum ovulation interval was noted during autumn(August to October), followed by winter (November to January), summer (May to July) and spring (February to April). The incidence of silent ovulations was during LBS than NBS (70.6% versus 29.4%). In autumn there was minimum intake of crude protein (CPI) and maximum intake of metabolizable energy (MEI, p<0.01). Calcium intake was higher in NBS than LBS calving buffaloes (p<0.01). Phosphorus, copper and magnesium intake was lower (p<0.05) and zinc intake was higher (p<0.01) in autumn, It was (p<0.05) and zinc intake was was higher (p<0.01) in autumn, It was concluded that onset of breeding season was associated with increasing MEI and decreasing CPI and minerals intake.
Keywords: Buffalo; Pakistan; Reproduction; season; Nutrition

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