The Effect Of Using hCG Insted Of GnRh in The 2nd Injection In The Ovysynch Program In Dairy cows. Journal of Hama University , [S. l.], v. 2, n. 3, 2019. Disponível em: https://journal.hama-univ.edu.sy/huj/article/view/196. Acesso em: 6 jun. 2026.