author(s)
Mohan M, Das DN, Avinash CH and Ramesha KP

abstract
The study aimed to understand effect of non- genetic factors influencing milk yield performance in Deoni cows. A total of 821 lactation records from 340 lactating cows along with their age at first calving, Parity, Season of calving were collected. These data were standardized and analysed for significant difference. Deoni showed significant increase (P<0.05) in both lactation milk yield and lactation length with increase in parity. Season of calving had significant affects (P<0.05) on lactation milk yield but not in lactation length. Increase in age at first calving revealed there was a significant difference (P<0.05) in both lactation milk yield and lactation length. Lactation milk yield and lactation length in Deoni cows were significantly affected by all factors considered in the study viz., parity, season of calving and age at first calving, whereas season of calving doesn’t affect lactation length significantly.