Translational Animal Science Abstract -

Modeling the effects of standardized ileal digestible valine to lysine ratio on growth performance of nursery pigs1,2

 

This article in TAS

  1. Vol. 1 No. 4, p. 448-457
    unlockOPEN ACCESS
     
    Received: July 28, 2017
    Accepted: Sept 05, 2017
    Published: September 28, 2017


    3 Corresponding author(s): abclark@ksu.edu
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doi:10.2527/tas2017.0049
  1. A. B. Clark 3*,
  2. M. D. Tokach*,
  3. J. M. DeRouchey*,
  4. S. S. Dritz,
  5. R. D. Goodband*,
  6. J. C. Woodworth*,
  7. K. J. Touchette and
  8. N. M. Bello§
  1. * Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan 66506
     Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan 66506
     Ajinomoto Heartland, Inc., Chicago, IL
    § Department of Statistics, College of Arts and Sciences, Kansas State University, Manhattan 66506

Abstract

Two experiments evaluated the effects of increasing Lys and Val on growth performance of nursery pigs. In Exp. 1,300 nursery pigs (PIC 327 × 1,050, initially 6.7 ± 1.4 kg BW) were randomly allotted to 1 of 6 diets containing 1.10, 1.20, 1.30, 1.40, 1.50, or 1.60% standardized ileal digestible (SID) Lys, with 10 pens per dietary treatment and 5 pigs per pen. Linear and nonlinear mixed models were fitted to estimate dose responses. From d 0 to 14, and for the overall 28 d period, ADG and G:F increased (linear, P < 0.001) as SID Lys increased, with no evidence of differences in ADFI. Dose response modeling indicated the SID Lys requirement for ADG and G:F was at 1.45% using a broken line linear (BLL) and greater than 1.60% using a quadratic polynomial (QP) model. In Exp. 2, 280 nursery pigs (PIC 327 × 1,050, initially 6.5 ± 1.3 kg BW) were allotted to 1 of 7 diets containing SID Val:Lys ratios of 50, 57, 63, 68, 73, 78, or 85%. The dietary SID Lys concentration 1.24% SID Lys which was below the estimated requirement from Exp. 1 and ensured the Val:Lys ratio was not underestimated. From d 0 to 14, ADG, ADFI, and G:F increased (quadratic, P < 0.039) with increasing SID Val:Lys. For ADG, the best fitting model was a BLL, with a breakpoint estimate of 62.9% SID Val:Lys [52.2, 73.7] ratio while for G:F the best fit model was a quadratic polynomial with a maximum G:F at 71.7% SID Val:Lys (95%CI:[58, > 85]). Average daily feed intake was also modeled with a quadratic polynomial and maximized at 73.7% Val:Lys (95% CI: [61, > 85]). In conclusion, the Val requirement ranged from approximately 63 to 74% of Lys depending on the response criteria modeled.

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