Evaluation of High-Lysine (Demand™) Corn for Growing-Finishing Pigs

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© 1995 American Registry of Professional Animal Scientists. Three experiments were conducted to assess the nutritive value of high yielding, high-Lys com for crossbred growingfinishing pigs. Completely randomized designs were used, average initial weight of the pigs was 21 kg in each experiment (Exp.), and each treatment was replicated three times with five pigs each in Exp. 1 and 2 and with four replications of three or four pigs each in Exp. 3. The experimental periods were 104, 35, and 120 d in Exp. 1,2, and 3, respectively. In Exp. 1, 105 pigs were allotted to seven treatments. Demand com (DC, .31% Lys) or conventional com (CC, .25% Lys) was used to formulate diets containing either 80, 100, or 120% of the Lys requirement for growing-finishing pigs. An additional diet contained CC on an equal-weight basis to DC in the diet that was formulated to contain 100% of the Lys requirement. As Lys level of the diets was increased, ADG, gain:feed (G:F), longissimus muscle area, percentage of muscling, and carcass weight increased (P<.01), but 10th rib fat thickness decreased (P<.0l). Com variety did not affect (P>.10) any response variable at any Lys level. In Exp. 2, 60 pigs were allotted to four treatments. Two all-com diets containing DC or CC as the sale source of Lys were compared with control diets containing DC or CC but were formulated to contain 100% of the Lys requirement; soybean meal provided the balance of Lys in these later two diets. Daily gain, ADFI, and G:F were higher (P<.01) in pigs fed the diets providing 100% of the Lys requirement than in pigs fed the all-com diets. Growth performance was not affected (P>.10) by com variety. In Exp. 3, 84 pigs were allotted to six treatments. Conventional com and DC were used to formulate diets containing either 80 or 110% of the Lys requirement, plus two DC diets formulated to provide CP equal to the CP content of the CC diets. As dietary Lys increased, ADG, ADFI, and G:F increased (P<.08). Pigs fed CC diets had increased (P<.05) G:F compared with pigs fed DC diets. Ov,erall ADG and ADFI were not affected (P>.10) by com type. These results indicate that highLys DC will result in growth performance and carcass characteristics equivalent to that of growing-finishing pigs fed CC in diets formulated to be equivalent in Lys.

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Professional Animal Scientist

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