Nutritional value of a genetically improved high-lysine, high-oil corn for young pigs

• Published in: Journal of animal science 2000-08, Vol.78 (8), p.2144-2149
• Main Authors: O'Quinn, P. R, Nelssen, J. L, Goodband, R. D, Knabe, D. A, Woodworth, J. C, Tokach, M. D, Lohrmann, T. T
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Animal Feed; Animal productions; Animals; Biological and medical sciences; Biotechnology; Corn; Corn Oil - genetics; Cross-Over Studies; Diet; Dietary Proteins; Digestion; Fundamental and applied biological sciences. Psychology; Genetic engineering applications; Genetics; Genetics and breeding of economic plants; Hogs; Ileum - metabolism; Lysine - genetics; Male; Nutrition; Nutritive Value; Plant breeding: fundamental aspects and methodology; Random Allocation; Swine - growth & development; Swine - metabolism; Terrestrial animal productions; Vertebrates; Zea mays - genetics
• ISSN: 0021-8812; 1525-3163; 0021-8812
• DOI: 10.2527/2000.7882144x

Two experiments were conducted to compare the nutritional adequacy of a genetically improved high-lysine, high-oil corn (HLHOC; .408% lysine, 6.21% fat, as-fed basis) and a high-oil corn (HOC; .289% lysine, 5.97% fat, as-fed basis) for young growing pigs. Experiment 1 used four non-littermate barrows (initially 20.0 kg BW) fitted with ileal T-cannulas in a crossover-designed digestion study. The .75% total lysine diets contained 8.5% casein and an equal amount of lysine (.25%) from the test corn. Apparent ileal digestibilities of amino acids, GE, DM, and CP were similar (P > .10) between diets. Apparent ileal lysine digestibilities were 65 and 71% for the HOC and HLHOC, respectively, assuming the lysine in casein to be 100% digestible. Experiment 2 used 100 barrows reared in a segregated early-weaning environment (initially 8.3 kg BW and 27 d of age) to evaluate five corn-soybean meal-based diets in a 2 x 2 factorial arrangement with main effects being corn type and dietary lysine (.80 or 1.15% digestible lysine). The fifth diet consisted of the .80% digestible lysine HOC diet supplemented with .23% additional L-lysine x HCl (.975% digestible lysine) to verify that lysine was the limiting amino acid in the low-lysine diets. Increasing digestible lysine from .80 to 1.15% increased (P < .001) ADG and gain/feed (G/F) regardless of corn variety. Combined ADG and G/F were .347 kg and .641 and .443 kg and .790 for the .80 and 1.15% digestible lysine diets, respectively. Within lysine level, corn type did not affect ADG, ADFI, or G/F (P > .10). The results of these studies indicate that the lysine in HLHOC is as available as the lysine in HOC and that HLHOC can be used successfully in swine diets.