Commercial validation of the true ileal digestible lysine requirement for 11- to 27-kg pigs

¹ Department of Animal Sciences, University of Missouri, Columbia, MO 65211
² Ajinomoto Heartland LLC, Chicago, IL 60631

^* To whom correspondence should be addressed. E-mail: alleeg{at}missouri.edu.

	Abstract

Five experiments utilizing 3,628 pigs were conducted to determine the true ileal digestible (TID) Lys requirement for 11- to 27-kg pigs fed corn-soybean meal diets. In Exp. 1, 216 barrows (initial BW = 11.5 kg) were utilized with dietary TID Lys levels from 1.05 to 1.40 % TID Lys (.07% increments). All diets were isocaloric (3.42 Mcal ME) and contained the same inclusion of soybean meal (33.1%). Dietary Lys content was increased by adding graded levels of L-Lys·HCl (0.0 to 0.445%) with other crystalline AA supplied to meet minimum AA to Lys ratios. For the 21-d period, ADG and G:F were linearly increased (P < 0.001) with increasing Lys levels. Experiments 2 through 5 were each conducted in different commercial research facilities. In Exp. 2, a five-point titration (1.05 to 1.41% TID Lys; 0.09% increments) was used containing the same level of SBM (34.25%) with graded levels of L-Lys·HCl addition as in Exp. 1 for a 16 d period. Exp. 3 utilized similar diets, but was a 28-d period from 11.8 to 28 kg. There were linear increases in ADG (P < 0.01) and G:F (P < 0.01) with increasing dietary Lys in both experiments. Based on these results, 2 additional 28-d experiments were conducted with similar diets, except for one additional level at 1.50% TID Lys. In Exp. 4, linear increases (P < 0.01) in ADG and G:F were observed from d 0 to 14. From d 14 to 28, there were quadratic increases (P < 0.04) in ADG and G:F which resulted in quadratic increases (P < 0.01) in ADG and G:F with increasing dietary Lys for the 28-d period. Similarly, in Exp. 5, there were linear increases (P < 0.01) in growth performance from d 0 to 14, but there were quadratic increases in G:F (P < 0.001) with increasing dietary Lys for the overall period. Data from all 5 experiments yielded a single-slope, broken-line response with requirement estimates from 1.33 and 1.35% TID Lys for 11 to 19 kg pigs. The 5 experiments give requirement estimates of 1.30% TID Lys (3.80 g TID lysine/Mcal ME) for 11- to 27-kg pigs, equivalent to 19 g TID Lys/kg gain.

Key Words: growth, lysine, nursery pigs

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