| Maximizing the use of supplemental amino acids in corn-soybean meal diets for 20- to 45-kilogram pigs. | |
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MedLine Citation:
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PMID: 21383035 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Four experiments were conducted to determine the Lys requirement, the maximum level of supplemental Lys that does not decrease growth performance, and to determine the order of limiting AA beyond Lys, Thr, Trp, and Met in a corn-soybean meal (C-SBM) diet for 20- to 45-kg pigs. All experiments were conducted for 27 to 28 d with purebred or crossbred barrows and gilts, which were blocked by initial BW. Treatments were replicated with 4 to 6 pens of 4 to 6 pigs per pen. In all experiments, pigs and feeders were weighed on d 0, 14, and 27 or 28. At the beginning and end of all experiments, blood samples were obtained from all pigs to determine plasma urea nitrogen (PUN) concentrations. In Exp. 1, 0.830, 0.872, 0.913, and 0.955% standardized ileal digestible (SID) Lys were fed, whereas 0.747, 0.788, 0.830, 0.872, and 0.913% SID Lys were fed in Exp. 2. Broken-line analysis requirement estimates could not be estimated from any response variable in Exp. 1, but in Exp. 2, using ADG and PUN, the estimated SID Lys requirement was 0.83%. In Exp. 3, 0, 0.118, 0.191, 0.264, and 0.335% supplemental Lys was added to achieve 0.83% SID Lys in all diets, and Thr, Trp, and Met were supplemented to maintain Thr:Lys, Trp:Lys, and TSAA:Lys of 0.65, 0.18, and 0.60, respectively. Based on ADG, ADFI, and G:F, up to 0.23% supplemental Lys can be added along with supplemental Thr, Trp, and Met without negatively affecting growth performance; PUN was linearly decreased (P < 0.001) by supplemental Lys. In Exp. 4, treatments were: 1) positive control (PC) without supplemental AA, 2) negative control (NC) with 0.335% supplemental Lys + 0.140% L-Thr + 0.035% L-Trp + 0.117% DL-Met, 3) NC + 0.044% L-Val, 4) NC + 0.021% L-Ile, and 5) NC + 0.044% L-Val + 0.021% L-Ile. Individual addition of Val and Ile did not improve (P < 0.10) ADG or G:F compared with the NC. The combined addition of Val + Ile resulted in ADG that was intermediate between the PC and NC diets but not different from either diet; G:F was not improved to that observed in pigs fed the PC diet. The PUN was not different among pigs fed diets with supplemental AA but lower than pigs fed the PC. The results of this research indicate that the Lys requirement for 20- to 45-kg pigs is 0.83% SID Lys, up to 0.23% supplemental Lys (0.29% L-Lys·HCl or 0.45% L-Lys·SO(4))( )can be added along with supplemental Thr, Trp, and Met without negatively affecting growth performance, and another AA besides Val and Ile may be limiting growth performance in a C-SBM diet with 0.335% supplemental Lys. |
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Authors:
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M L Roux; A L Donsbough; A M Waguespack; S Powell; T D Bidner; R L Payne; L L Southern |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-7 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-8 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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School of Animal Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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