Fifth one Nili-Ravi dairy buffaloes in their last two months of gestation, were selected in NWFP Pakistan. Rectal palpation was carried out fornightly, until the occurrence of first estrus. Ovulation was confirmed per rectum and milk progesterone levels (MPL). Body condition score (BCS)was recorded weekly. Milk samples were collected weekly for MPLand blood samples fornightly for metabolites analysis. Milk yield was recorded and samples were collecter for milk fat. The buffaloes calving during the normal breeding season (NBS, August to January)had short (p<0.01) postpartum estrus interval of 55.95 4.90 days versus 91.15 11.61 days in the buffaloes calving during the low breeding season (LBS, February to July). MPL in the LBS calvers remained lower than NBS calves (p<0.01). The incidence of silent ovulation was higher during LBS as compared to NBS (70.6% versus 29.4%). MPL showed a pattern opposite to atmospheric temperature. In NBS calvers serum glucose levels were higher (p<0.01) and magnesium levels were lower (p<0.01) than performance in buffaloes calving in the LBS coincided with a low BCS (p<0.01). Fat corrected milk production (FCM) was higher in NBS than LBS (p<0.01) calvers.
Qureshi, M., Habib, G., Samad, H. A., Lodhi, L. A., & Usmani, R. H. (1999). Study on factors leading to seasonality of reproduction in dairy buffaloes II. non-nutritional factors. Asian-Australasian Journal of Animal Sciences, 12(7), 1025-1030. https://doi.org/10.5713/ajas.1999.1025