Shamshidin A, Alshinbaev O, Rakhimzhanova D, Mussabekov A. Study of semen production of sire’s Holstein breed. Sci. J. Zool. [Internet]. 2017Nov.18 [cited 2024Nov.22];6(11):55-9. Available from: http://sjournals.com/index.php/sjz/article/view/1621