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Effects of Either Sweet or Semi-Sweet Blue Lupine on Performance of Swine

University of Georgia, Coastal Plain Station^,3,4,5,, Tifton 31793

Abstract

Two trials with growing-finishing pigs and a digestion and N balance trial with growing pigs were conducted to determine the feeding value of sweet blue lupine seed. Growth rate and feed to gain ratios were not altered (P>.05) when 25% of the soybean meal contained in the control corn-soybean meal diet was replaced by lupine seed meal; however, pigs fed diets of corn and equal parts of soybean meal and lupine seed meal gained weight 16% slower (P<.05) and required 9% more (P<.05) feed per unit of gain than pigs fed the control diet. In a second trial, performance of pigs fed a diet containing equal parts of soybean meal and sweet lupine seed meal was similar (P>.05) to that of pigs fed the control diet of corn and soybean meal. However, when lysine and methionine were added to the diet containing equal parts soybean meal and lupine seed meal, feed efficiency was improved (P<.05). Pigs fed a corn-sweet lupine seed diet that was made isolysine and isomethionine with the control corn-soybean meal diet gained weight 31% slower, consumed 17% less feed and required 14% more feed/unit of weight gain than did pigs fed the control diet (P<.05). Digestion coefficients for dry matter, gross energy and crude protein of pigs fed the control corn-soybean meal diet were greater (P<.01) than those for pigs fed the corn-lupine seed meal diet made isolysine and isomethionine with the control diet. Likewise, N intake, balance and percentage N retained were greater (P<.01) for pigs fed the control diet. In a third experiment, pigs fed a corn-soybean meal diet gained weight 64% faster (P<.01) and consumed 53% more (P<.01) feed than pigs fed a corn-semi-sweet blue lupine seed diet; however, feed conversion was similar (P> .05) for both diets. Pig performance was not improved (P>.05) by extruding the lupine. Total alkaloid content of the semi-sweet lupine before and after extruding was .27 and .17%, respectively.

¹ Dept. of Anim. Sci.

² Research Agronomist, USDA, ARS, Tifton, GA 31793.

³ Supported by State and Hatch funds allocated to the Georgia Agr. Exp. Sta.

⁴ Reference to a company or product name does not imply approval or recommendation of the product by the USDA to the exclusion of others that may be suitable.

⁵ The authors thank Dr. Richard F. Keeler for conducting alkaloid analyses on the lupine seed.