KANTANAMALAKUL, Chittima, Panwadee SOPANNARATH, and Sornthep TUMWASORN. 2011. “Estimation of Breed Effects on Litter Traits at Birth in Yorkshire and Landrace Pigs”. Walailak Journal of Science and Technology (WJST) 4 (2):175-86. https://wjst.wu.ac.th/index.php/wjst/article/view/97.