Effects of standardized ileal digestible valine: lysine ratio on nursery pig performance

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dc.contributor.author Clark, A. B.
dc.contributor.author Tokach, Michael D.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Touchette, K. J.
dc.contributor.author GonAalves, M. A. D.
dc.contributor.author DeRouchey, Joel M.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Woodworth, Jason C.
dc.date.accessioned 2016-09-20T17:40:41Z
dc.date.available 2016-09-20T17:40:41Z
dc.identifier.uri http://hdl.handle.net/2097/34104
dc.description Citation: Clark, A. B., Tokach, M. D., Dritz, S. S., Touchette, K. J., GonAalves, M. A. D., DeRouchey, J. M., . . . Woodworth, J. C. (2016). Effects of standardized ileal digestible valine: lysine ratio on nursery pig performance. Journal of Animal Science, 94, 45-45. doi:10.2527/msasas2016-097
dc.description.abstract A total of 280 pigs (PIC 327 × 1050; initially 6.53 kg BW) were used in a 28-d trial to evaluate the effects of increasing standardized ileal digestible (SID) Val:Lys ratio on nursery pig growth performance. Pigs were weaned at 21 d of age and 5 pigs allotted to each nursery pen according to BW and gender. A common diet was fed for 5 d when pens were assigned to 1 of 7 dietary treatments in a randomized block design with 8 pens per treatment. Experimental diets were fed from d 0 to 14 followed by a common diet from d 14 to 28. The 7 dietary treatments were 50, 57, 63, 68, 73, 78, and 85% SID Val:Lys. A prior experiment demonstrated a Lys requirement of 1.44 and 1.45% SID Lys for ADG and G:F, respectively, for pigs in this facility. Thus, diets were formulated to 1.24% SID Lys to ensure pigs were below the Lys requirement. As SID Val:Lys increased, ADG, ADFI, and G:F increased (quadratic, P < 0.05). Growth response variables were fitted using linear and nonlinear dose–response models with pen as the experimental unit and initial BW as a covariate with ADG and G:F fitted using heterogeneous and homogenous residual variance, respectively. Models fit were quadratic polynomial (QP), broken-line linear (BLL), and broken-line quadratic with best fit determined according to Bayesian information criterion. For ADG, the best fitting model was BLL and maximum ADG was achieved with a minimum of 62.9% SID Val:Lys (95% CI: [52.2, 73.7%]). For G:F, the best fitting model was QP [0.010294 + 0.017526*(Val:Lys)– 0.000122*(Val:Lys)2] using a 6.53-kg initial BW. This resulted in a maximum G:F at 71.7% SID Val:Lys and 99% of maximum achieved at a 64.4% ratio. In summary, the SID Val:Lys requirement ranged from 62.9 to 71.7% depending on the response model.
dc.relation.uri https://doi.org/10.2527/msasas2016-097
dc.rights Copyright © 2016. American Society of Animal Science.
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/0021-8812/
dc.subject Amino Acids
dc.subject Nursery Pigs
dc.subject Valine
dc.subject Agriculture
dc.title Effects of standardized ileal digestible valine: lysine ratio on nursery pig performance
dc.type Article
dc.date.published 2016
dc.citation.doi 10.2527/msasas2016-097
dc.citation.epage 45
dc.citation.issn 0021-8812
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 45
dc.citation.volume 94
dc.description.embargo 2017-04
dc.contributor.authoreid mtokach
dc.contributor.authoreid dritz
dc.contributor.authoreid jderouch
dc.contributor.authoreid goodband
dc.contributor.authoreid jwoodworth


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