Effects of standardized ileal digestible threonine to lysine ratio on growth performance of nursery, growing, and finishing pigs

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ID: 329050
2026
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Abstract
Abstract The objective of these experiments was to evaluate the effect of standardized ileal digestible (SID) Thr:Lys ratio on growth performance of late nursery, growing, and finishing pigs. Four experiments were conducted using corn-soybean meal-based diets with pigs allotted to 5 or 6 treatments in randomized complete block designs. In Exp. 1, 987 late nursery pigs (initially 11.8 ± 0.32 kg) were used with 22 to 27 pigs per pen, 8 replications per treatment, and 5 SID Thr:Lys ratios from 53 to 68% of Lys. Increasing SID Thr:Lys ratio increased (linear, P ≤ 0.005) ADG and final BW. Average daily feed intake decreased then increased (quadratic, P < 0.001), therefore increasing then decreasing (quadratic, P < 0.001) G:F. In Exp. 2, 875 pigs (initially 43.4 ± 0.58 kg) were used with 21 to 27 pigs per pen, 7 replications per treatment, and 5 SID Thr:Lys ratios from 53 to 68% of Lys. Increasing SID Thr:Lys ratio increased (linear, P ≤ 0.037) ADG, final BW, and G:F. Dose-response models developed using the data from Exp. 1 and 2 predicted a requirement estimate for ADG beyond the highest dose tested (68% SID Thr:Lys ratio), which led us to test a wider range of SID Thr:Lys ratios in Exp. 3 and 4. In Exp. 3, 684 pigs (initially 37.4 ± 1.36 kg) were used with 9 or 10 pigs per pen, 12 replications per treatment, and 6 SID Thr:Lys ratios from 53 to 78% of Lys. Increasing SID Thr:Lys ratio increased then plateaued (quadratic, P ≤ 0.047) final BW, ADG, G:F and tended (quadratic, P = 0.093) to decrease then increase blood urea N (BUN). In Exp. 4, 662 pigs (initially 96.2 ± 1.04 kg) were used with 8 to 10 pigs per pen, 11 or 12 replications per treatment, and 6 SID Thr:Lys ratios from 53 to 78% of Lys. Increasing SID Thr:Lys ratio tended to increase then decrease (quadratic, P ≤ 0.063) final BW, ADG, and G:F, with the greatest numeric response observed between 63 and 68% SID Thr:Lys ratio. Data from Exp. 3 and 4 were combined and used to fit dose response curves for ADG, G:F, and BUN. A quadratic polynomial (QP) model suggested that ADG was maximized at 68.6% SID Thr:Lys, while a similar fitting broken-line linear (BLL) model suggested no further improvement in ADG beyond 61.1% SID Thr:Lys. A BLL model suggested no further improvement in G:F beyond 59.2% SID Thr:Lys. A QP model suggested that BUN was minimized at 69.2% SID Thr:Lys. These data suggest that SID Thr:Lys requirements are similar for pigs from 37 to 70 and 96 to 120 kg.
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Authors Rafe Q Royall, Mike D Tokach, Jason C Woodworth, Joel M DeRouchey, Robert D Goodband, Jordan T Gebhardt, Carine M Vier, Matthew Spindler, Weasley Orlando, Luis Zaragoza, Ning Lu, Wayne Cast, Dannielle F Wilson-Wells, Julia Holen, Alyssa Betlach
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Journal Translational animal science
Year 2026
DOI
10.1093/tas/txag142
URL
https://doi.org/10.1093/tas/txag142
Keywords Keywords not found

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