Statistical evaluation of some environmental factors affecting the gross efficiency of crude protein in high producing dairy cows

Pouya ZAMANI, Seyed Reza MIRAEI-ASHTIANI, Daryoush ALIPOUR, Hasan ALIARABI, Ali Asghar SAKI, Ahmad AHMADI and Khalil ZABOLI

Turkish Journal of Veterinary and Animal Sciences 35 ( 2 ): 123 - 130 , 2011