Yusuf, Muhammad, Abdul Latief Toleng, Djoni Prawira Rahardja, Sahiruddin Sahiruddin, and Andi Fausiah. 2017. “Reproductive Performance of Dairy Friesian Holstein Heifers (a Case Study in Enrekang, Indonesia)”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 36 (1):33-40. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7945.