Utilization of glutamic acid by-product as pig feed
1996
Napaporn Theerasaksilapa
Utilization of glutamic acid by-product as pig feed on performances of growing-finishing pigs was conducted using 40 Large White pigs of 30 kg body weight. The animals were divided into five groups of 8 animal each and containing an equal numbers of castrated males and females. Each group of animals was randomly fed one of the experimental diets as following. Diet 1: A control corn-soybean-fishmeal diet. Diets 2, 3, 4 and 5: Diets containing 10, 20, 30 and 40 percent of glutamic acid by-product which was a mixture of cassava meal and liquid glutamic acid by-product at a ration 1:1 by weight and then sundried. Every experimental diets were isonitrogenous, isocaloric and formulated according to ARC (1981) recommendation. The animals were kept in individual cages where feed and water were provided ad libitum. When the animals reached 90 kg body weight, four pigs (two from each sex) of each group were randomly slaughtered for study on carcass characteristics. The result indicated that in growing stage the pigs fed diets containing 10 percent of glutamic acid by-product (diet 2) had the lower feed intake than control diet. In fattening stage, the feed conversion ratio of the pigs fed the diet 2 were not statistically different from that of the control group. And the pigs fed diets containing 10 percent of glutamic acid by-product had the highest loin eye area (P0.05), higher lean percentage than the control group (P0.05), and non-significantly (P0.05) thinner P2 backfat than those of the control diet. However, increased level of glutamic acid by-product (20, 30 and 40 percents) tended to decrease carcass percentage and loin eye area as well as to increase P2 backfat thickness.
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