PRACTICAL USE OF L-GLUTAMIC ACID MOTHER L IQUOR AS A FEED ADDITIVE

The practicality of L-glutamic acid mother liquor for use as a livesto ck feed additive was studied. At water activity of 0.81, mold did not grow in the feed additive during long-term storage under either aerobi c or anaerobic conditions. Results of a subacute toxicity test in rats suggested the safety of the additive. The addition of the mother liqu or feed additive to feed for growing swine improved the feed intake, t he daily body weight gain, and the feed conversion rate. Digestibility of crude protein, crude fat, and crude fiber was increased when the f eed contained a lysine supplement and the mother liquor feed additive. The urinary nitrogen excretion of pigs given a lysine supplement in t he feed with the mother liquor feed additive was less than that of pig s not given a lysine supplement with or without the mother liquor. It means that the efficiency of use of proteins in the mother liquor was improved by the addition of lysine.