L-glutamic Acid Mother Liquor Fermented from Hydrolyzed Cassava Starch(Glucose Solution) as a Feed Additive

Abstract

The use of L-glutamic acid mother liquor as a livestock feed additive was studied. The mother liquor was fermented from hydrolyzed cassava starch, and monosodium glutamate was removed. The mother liquor was then concentrated, which caused dissoluble L-glutamic acid to crystallize, giving a second mother liquor. This mother liquor was concentrated again, and 50% of the minerals dissolved in it were removed. The chemical properties of the remaining mother liquor and the possibility of its use as a livestock feed additive were studied. The lethal dose for 50% of test mice was 36 g/kg of body weight in the test of acute toxicity. Digestible crude protein and total digestible nutrients accounted for 16.8% and 30.4%, respectively. The addition of the mother liquor to ground cassava chips increased the protein concentration, and the most suitable ratio of mother liquor to ground cassava chips for feed intake by cattle was 1 : 3.5. This mix was used to replace 0%, 50%, 75%, or 100% of the maize in feed concentrates for fattening cattle. Feed intake, daily body weight gain, the feed conversion rate, and carcass yiled were greatest in when 50% of the maize was replaced ; protein intake was the same as when no maize was replaced, and the salt intake was low. © 1995, Japan Society for Bioscience, Biotechnology, and Agrochemistry. All rights reserved.