Jureerat Sumretprasong, Anone Thuangsanthia, Narong Leangcharuen, Keerati Thijae, and Sarakit Thawinprawat. 2010. “Effects of Equine Chorionic Gonadotropin on Progesterone-Based Estrus Synchronization in Holstein Friesian X Brahman Recipient Cows”. Agriculture and Natural Resources 44 (2). Bangkok, Thailand:196-201. https://li01.tci-thaijo.org/index.php/anres/article/view/244906.