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

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... Full description

Journal Title: Journal of animal science August 2015, Vol.93(8), pp.3909-3918
Main Author: Gonçalves, M A D
Other Authors: Nitikanchana, S , Tokach, M D , Dritz, S S , Bello, N M , Goodband, R D , Touchette, K J , Usry, J L , Derouchey, J M , Woodworth, J C
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1525-3163 ; DOI: 1525-3163 ; DOI: 10.2527/jas.2015-9083
Link: http://search.proquest.com/docview/1720452303/?pq-origsite=primo
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title: Effects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs.
format: Article
creator:
  • Gonçalves, M A D
  • Nitikanchana, S
  • Tokach, M D
  • Dritz, S S
  • Bello, N M
  • Goodband, R D
  • Touchette, K J
  • Usry, J L
  • Derouchey, J M
  • Woodworth, J C
subjects:
  • Animal Feed–Analysis
  • Animal Nutritional Physiological Phenomena–Physiology
  • Animals–Veterinary
  • Bayes Theorem–Physiology
  • Body Weight–Chemistry
  • Diet–Metabolism
  • Female–Growth & Development
  • Ileum–Physiology
  • Lysine–Chemistry
  • Male–Physiology
  • Swine–Physiology
  • Tryptophan–Physiology
  • Tryptophan
  • Lysine
ispartof: Journal of animal science, August 2015, Vol.93(8), pp.3909-3918
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 [+ or -] 0.15 kg, mean [+ or -] 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 [+ or -] 1.35 BW, mean [+ or -] 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]: [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.
language: eng
source:
identifier: E-ISSN: 1525-3163 ; DOI: 1525-3163 ; DOI: 10.2527/jas.2015-9083
fulltext: fulltext
issn:
  • 15253163
  • 1525-3163
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titleEffects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs.
creatorGonçalves, M A D ; Nitikanchana, S ; Tokach, M D ; Dritz, S S ; Bello, N M ; Goodband, R D ; Touchette, K J ; Usry, J L ; Derouchey, J M ; Woodworth, J C
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subjectAnimal Feed–Analysis ; Animal Nutritional Physiological Phenomena–Physiology ; Animals–Veterinary ; Bayes Theorem–Physiology ; Body Weight–Chemistry ; Diet–Metabolism ; Female–Growth & Development ; Ileum–Physiology ; Lysine–Chemistry ; Male–Physiology ; Swine–Physiology ; Tryptophan–Physiology ; Tryptophan ; Lysine
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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 [+ or -] 0.15 kg, mean [+ or -] 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 [+ or -] 1.35 BW, mean [+ or -] 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.
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titleEffects of standardized ileal digestible tryptophan: lysine ratio on growth performance of nursery pigs.
authorGonçalves, M A D ; Nitikanchana, S ; Tokach, M D ; Dritz, S S ; Bello, N M ; Goodband, R D ; Touchette, K J ; Usry, J L ; Derouchey, J M ; Woodworth, J C
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