Kaewtapee, Chanwit, and Chaiyapoom Bunchasak. 2019. “Comparative Effect of DL-Methionine and DL-Methionine Hydroxy Analogue Supplemented Diet on Productive Performance, Fat Accumulation and Lipid Profile in Blood of Meat-Type Ducks”. The Thai Journal of Veterinary Medicine 48 (4):645-53. https://he01.tci-thaijo.org/index.php/tjvm/article/view/179858.