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

dc.citation.doi10.2527/msasas2016-097
dc.citation.epage45
dc.citation.issn0021-8812
dc.citation.jtitleJournal of Animal Science
dc.citation.spage45
dc.citation.volume94
dc.contributor.authorClark, A. B.
dc.contributor.authorTokach, Michael D.
dc.contributor.authorDritz, Steven S.
dc.contributor.authorTouchette, K. J.
dc.contributor.authorGonAalves, M. A. D.
dc.contributor.authorDeRouchey, Joel M.
dc.contributor.authorGoodband, Robert D.
dc.contributor.authorWoodworth, Jason C.
dc.contributor.authoreidmtokach
dc.contributor.authoreiddritz
dc.contributor.authoreidjderouch
dc.contributor.authoreidgoodband
dc.contributor.authoreidjwoodworth
dc.date.accessioned2016-09-20T17:40:41Z
dc.date.available2016-09-20T17:40:41Z
dc.date.published2016
dc.descriptionCitation: 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.abstractA 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.description.embargo2017-04
dc.identifier.urihttp://hdl.handle.net/2097/34104
dc.relation.urihttps://doi.org/10.2527/msasas2016-097
dc.rightsCopyright © 2016. American Society of Animal Science.
dc.rights.urihttp://www.sherpa.ac.uk/romeo/issn/0021-8812/
dc.subjectAmino Acids
dc.subjectNursery Pigs
dc.subjectValine
dc.subjectAgriculture
dc.titleEffects of standardized ileal digestible valine: lysine ratio on nursery pig performance
dc.typeArticle

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