This study was conducted to evaluate the effects of decreasing dietary protein and rumen-undegradable protein (RUP) on production performance, nitrogen retention, and nutrient digestibility in high-producing Holstein cows in early lactation. Twelve multiparous Holstein lactating cows (2 lactations; 50 ± 7 d in milk; 47 kg/d of milk production) were used in a Latin square design with 4 treatments and 3 replicates (cows). Treatments 1 to 4 consisted of diets containing 18, 17.2, 16.4, and 15.6
作者：H, Bahrami-Yekdangi；M, Khorvash；G R, Ghorbani；M, Alikhani；R, Jahanian；E, Kamalian
来源：Journal of dairy science 2014 年 97卷 6期
