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

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dc.contributor.author Goncalves, M. A. D.
dc.contributor.author Nitikanchana, S.
dc.contributor.author Tokach, Michael D.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Bello, Nora M.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Touchette, K. J.
dc.contributor.author Usry, J. L.
dc.contributor.author DeRouchey, Joel M.
dc.contributor.author Woodworth, Jason C.
dc.date.accessioned 2016-03-28T19:16:07Z
dc.date.available 2016-03-28T19:16:07Z
dc.identifier.uri http://hdl.handle.net/2097/32188
dc.description Citation: 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.description Two 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.relation.uri https://doi.org/10.2527/jas.2015-9083
dc.rights Copyright © 2015. American Society of Animal Science. 
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/0021-8812/
dc.subject Amino Acid Ratio
dc.subject Growth
dc.subject Lysine
dc.subject Nursery Pig
dc.subject Tryptophan
dc.subject Amino-Acids
dc.title Effects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs
dc.type Article
dc.date.published 2015
dc.citation.doi 10.2527/jas2015-9083
dc.citation.epage 3918
dc.citation.issn 0021-8812
dc.citation.issue 8
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 3909
dc.citation.volume 93
dc.contributor.authoreid mtokach
dc.contributor.authoreid dritz
dc.contributor.authoreid nbello
dc.contributor.authoreid goodband
dc.contributor.authoreid jderouch
dc.contributor.authoreid jwoodworth


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