Thuy N T and Preston T R 2011: Supplementing diets of lactating sows with catfish (Pangasius hypophthalmus) by-product oil; effects on milk production and fatty acid composition, and performance of sows and piglets. Livestock Research for Rural Development. Volume 23, Article #260. Retrieved , from http://www.lrrd.org/lrrd23/12/thuy23260.htm