The present investigation was undertaken to study the effect of different non-genetic factors viz. year, season and parity on various production traits. The 1177 lactation records of 272 Murrah buffaloes, progeny of 53 bulls that were maintained at GADVASU dairy farm, calved during 1981-2011 were studied. The overall least squares mean for persistency, 305-days milk yield and peak yield were 0.826±0.003, 2173.54±21.14 Kg and 12.65±0.09 kg, respectively. The effect of period of calving and parity was highly signifi cant (P<0.01) on persistency, 305-days milk yield and peak yield. Peak yield also signifi cantly affected by season of calving while the effect of season on persistency and 305-days was non-signifi cant. The study concluded that the production traits were mainly affected by the non genetic environmental factors such as managerial changes during years, seasonal variations and parity of Murrah.