HayatiR. N., Panjono Panjono, and IrawanA. “Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein”. Tropical Animal Science Journal 44, no. 1 (March 9, 2021): 16-23. Accessed April 26, 2024. https://jai.ipb.ac.id/index.php/tasj/article/view/32183.