Abstract

The study was planned to determine the effect of degradability of different protein sources and its impact on milk composition and milk urea nitrogen in Holstein Friesen cows at Peshawar Khyber, Pakhtunkhwa, Pakistan. For this purpose nine healthy early lactating cows were selected. All the chosen animals were assigned into three different groups on the basis of feeding group A, B and C, respectively. Total mixed ration (TMR) was formulated as per availability of different degradable protein sources (cotton seed cake and mustard seed cake) and named as ration 1, 2 and 3, respectively. One group was kept as control and fed on only TMR at libitum and the other two groups B and C were supplemented with TMR added with differentials degradable proteins for one month. The milk production and composition (milk fat, Solid not fat (SNF), milk protein) and milk urea nitrogen were significantly (P<0.05) increased in group B (ration 2). Hence, it may be concluded that ration 2 (group 2) of different sources of protein have improved the milk production, milk composition and milk urea nitrogen.