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Effects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs

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dc.citation.doi10.2527/jas2015-9083
dc.citation.epage3918
dc.citation.issn0021-8812
dc.citation.issue8
dc.citation.jtitleJournal of Animal Science
dc.citation.spage3909
dc.citation.volume93
dc.contributor.authorGoncalves, M. A. D.
dc.contributor.authorNitikanchana, S.
dc.contributor.authorTokach, Michael D.
dc.contributor.authorDritz, Steven S.
dc.contributor.authorBello, Nora M.
dc.contributor.authorGoodband, Robert D.
dc.contributor.authorTouchette, K. J.
dc.contributor.authorUsry, J. L.
dc.contributor.authorDeRouchey, Joel M.
dc.contributor.authorWoodworth, Jason C.
dc.contributor.authoreidmtokach
dc.contributor.authoreiddritz
dc.contributor.authoreidnbello
dc.contributor.authoreidgoodband
dc.contributor.authoreidjderouch
dc.contributor.authoreidjwoodworth
dc.date.accessioned2016-03-28T19:16:07Z
dc.date.available2016-03-28T19:16:07Z
dc.date.published2015
dc.descriptionCitation: Goncalves, M. A. D., Nitikanchana, S., Tokach, M. D., Dritz, S. S., Bello, N. M., Goodband, R. D., . . . Woodworth, J. C. (2015). Effects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs. Journal of Animal Science, 93(8), 3909-3918. doi:10.2527/jas2015-9083
dc.descriptionTwo experiments were conducted to estimate the standardized ileal digestible (SID) Trp:Lys ratio requirement for growth performance of nursery pigs. Experimental diets were formulated to ensure that lysine was the second limiting AA throughout the experiments. In Exp. 1 (6 to 10 kg BW), 255 nursery pigs (PIC 327 x 1050, initially 6.3 +/- 0.15 kg, mean +/- SD) arranged in pens of 6 or 7 pigs were blocked by pen weight and assigned to experimental diets (7 pens/diet) consisting of SID Trp: Lys ratios of 14.7%, 16.5%, 18.4%, 20.3%, 22.1%, and 24.0% for 14 d with 1.30% SID Lys. In Exp. 2 (11 to 20 kg BW), 1,088 pigs (PIC 337 x 1050, initially 11.2 kg +/- 1.35 BW, mean +/- SD) arranged in pens of 24 to 27 pigs were blocked by average pig weight and assigned to experimental diets (6 pens/diet) consisting of SID Trp: Lys ratios of 14.5%, 16.5%, 18.0%, 19.5%, 21.0%, 22.5%, and 24.5% for 21 d with 30% dried distillers grains with solubles and 0.97% SID Lys. Each experiment was analyzed using general linear mixed models with heterogeneous residual variances. Competing heteroskedastic models included broken-line linear (BLL), broken-line quadratic (BLQ), and quadratic polynomial (QP). For each response, the best-fitting model was selected using Bayesian information criterion. In Exp. 1 (6 to 10 kg BW), increasing SID Trp: Lys ratio linearly increased (P < 0.05) ADG and G:F. For ADG, the best-fitting model was a QP in which the maximum ADG was estimated at 23.9% (95% confidence interval [CI]: [< 14.7%, > 24.0%]) SID Trp: Lys ratio. For G: F, the best-fitting model was a BLL in which the maximum G: F was estimated at 20.4% (95% CI: [14.3%, 26.5%]) SID Trp: Lys. In Exp. 2 (11 to 20 kg BW), increasing SID Trp: Lys ratio increased (P < 0.05) ADG and G: F in a quadratic manner. For ADG, the best-fitting model was a QP in which the maximum ADG was estimated at 21.2% (95% CI: [20.5%, 21.9%]) SID Trp: Lys. For G: F, BLL and BLQ models had comparable fit and estimated SID Trp: Lys requirements at 16.6% (95% CI: [16.0%, 17.3%]) and 17.1% (95% CI: [16.6%, 17.7%]), respectively. In conclusion, the estimated SID Trp: Lys requirement in Exp. 1 ranged from 20.4% for maximum G: F to 23.9% for maximum ADG, whereas in Exp. 2 it ranged from 16.6% for maximum G: F to 21.2% for maximum ADG. These results suggest that standard NRC (2012) recommendations may underestimate the SID Trp: Lys requirement for nursery pigs from 11 to 20 kg BW.
dc.identifier.urihttp://hdl.handle.net/2097/32188
dc.relation.urihttps://doi.org/10.2527/jas.2015-9083
dc.rightsCopyright © 2015. American Society of Animal Science. 
dc.rights.urihttp://www.sherpa.ac.uk/romeo/issn/0021-8812/
dc.subjectAmino Acid Ratio
dc.subjectGrowth
dc.subjectLysine
dc.subjectNursery Pig
dc.subjectTryptophan
dc.subjectAmino-Acids
dc.titleEffects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs
dc.typeArticle

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