Evaluation of non-genetic factors affecting lactation traits of Frieswal cows in northern zone of India.

Data pertaining to 9,148 lactation records of Frieswal cows sired by 97 bulls from 1991 to 2012 and maintained at Military Farms (Meerut and Ambala) were used in the study. Results of the study clearly indicated that the nongenetic factors like farm, parity, season and period of calving had significant effect on the lactation traits like total lactation milk yield, peak yield and lactation length. So the adjustments have to be taken for accurate estimation of genetic parameters and breeding values. Since the Frieswal cattle is affected by non-genetic factors, proper production strategies should be adopted to improve the performance of Frieswal cows. [ABSTRACT FROM AUTHOR]