Pha-obnga, Nawarat, Chalong Wachirapakorn, and Suneerat Aiumlamai. 2017. “Effect of Dietary Polyunsaturated Fatty Acids from Rubber Seed Kernel on Reproductive Performance in Dairy Heifers”. The Thai Journal of Veterinary Medicine 47 (4):421-33. https://he01.tci-thaijo.org/index.php/tjvm/article/view/107276.