Effects of dietary cowpea (Vigna sinensis) hay and protein level on milk yield, milk composition, N efficiency and profitability of dairy cows
Keywords: اوره شیر N; BW; body weight; CP; crude protein; DM; dry matter; DMI; dry matter intake; FCM; fat-corrected milk; IOF; income over feed cost; MUN; milk urea N; NDF; neutral detergent fiber; OM; organic matter; TMR; totally mixed ration; Cowpea hay; Dietary crude prote