Urea molasses mineral block under various feeding systems improved nutrient digestibility, productive performance and blood biochemical profile of Yaks oleh Muhammad Mobashar, Muhammad Tahir Khan, Maria Marjan, Shakoor Ahmad, Umar Farooq, Muhammad Farooq Khalid, Riaz Mustafa, Nadar Khan, Abu Bakkar Sadiq, Anwar Shah, Ahmed A. A. Abdel-Wareth