Effects of non-genetic factors on lactation milk yield and peak yield of swamp buffalo and their repeatability

A study was made to find out the effect of various non-genetic factors on lactation milk yield and peak yield based on 500 lactation records of 164 swamp buffaloes maintained at Livestock Research Station, Assam Agricultural University. The overall mean of lactation milk yield and peak yield were found 514.16 ± 7.67 kg and 3.20 ± 0.05, kg respectively. Effect of lactation order and period of calving on both the trait were found to be significant (P<0.01). Lactation milk yield increased gradually from first to fourth lactation and then declined. Effect of season of calving was not found significant. The repeatability estimates for lactation milk yield and peak yield were 0.799 ± 0.003 and 0.448 ± 0.006, respectively.