... -threonine feed grade 1.Assay% 98.5max 2.Packing:25kg bags 3.ISO9001 HACCP FAMI-Q 4.Manufacture L- threonine feed grade1. ... promote the growth and development results . Medicine , due to feed-grade L - threonine structure containing hydroxyl groups on the human ... , feed-grade L-threonine as a feed amino acids, widely used to add the piglet feed , pig feed, chicken feed , shrimp feed and eel feed . ...