N. Y. Khudhair, Y. M. Rasheed, and M. Y. Mahmood, “Effect of long and short-term progestagen treatments combined with PMSG and PGF2α on estrus synchronization in Iraqi goats during breeding season”, Kufa Jou. Vete. Med. Sci., vol. 5, no. 2, pp. 295–305, Dec. 2014.