Validating a dietary approach to determine amino acid:lysine ratios for pigs

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dc.contributor.author Goncalves, Marcio Antonio Dornelles
dc.contributor.author Tokach, Michael D.
dc.contributor.author Dritz, Steven S.
dc.contributor.author Touchette, K. J.
dc.contributor.author DeRouchey, Joel M.
dc.contributor.author Woodworth, Jason C.
dc.contributor.author Goodband, Robert D.
dc.date.accessioned 2015-04-24T19:52:57Z
dc.date.available 2015-04-24T19:52:57Z
dc.date.issued 2015-04-24
dc.identifier.uri http://hdl.handle.net/2097/19097
dc.description Swine Industry Day, 2014 is known as Swine Day, 2014 en_US
dc.description.abstract Standardized ileal digestible (SID) amino acid:lysine (AA:Lys) ratio experiments are commonly conducted to estimate the AA requirement of pigs relative to lysine (Lys) and allow for accurate diet formulation. The objective of the studies herein was to validate a dietary approach to determine the optimal SID AA:Lys ratio for pigs using tryptophan (Trp) as a model. Four 21-d experiments were conducted in which pigs (337 × 1050; PIC) were fed corn-soybean meal–based diets with 30% corn dried distillers grains with solubles (DDGS). A total of 1,188, 1,232, 1,204, and 1,183 pigs with initial BW of 28.5 ± 0.4, 50.1 ± 1.3, 127.0 ± 2.5, and 192.5 ± 2.6 lb were used in experiments 1, 2, 3, and 4, respectively. Each experiment had 11 pens per treatment with 24 to 28 pigs per pen. In Experiment 1, each pen housed the same number of barrows and gilts, whereas in Experiments 2 to 4 only gilts were used. Dietary treatments were: (1) High CP, High Lys, and High Trp:Lys ratio (HHH); (2) Low CP, High Lys, and High Trp:Lys ratio (LHH); (3) Low CP, Low Lys, and High Trp:Lys ratio (LLH); and (4) Low CP, Low Lys, and Low Trp:Lys ratio (LLL). The SID Trp concentrations used were 14.5 vs. 20% of Lys, CP was at least 3 percentage units different, and SID Lys levels were 0.01 percentage unit above the estimated requirement at the expected initial BW and 0.10 or 0.05 percentage units below requirement at the expected final BW of the Experiment 1 (nursery) and Experiments 2, 3, and 4 (finishing), respectively. In Experiment 1, decreasing CP (HHH vs. LHH) did not influence ADG but increased (P < 0.05) F/G. Decreasing Lys (LHH vs. LLH) and decreasing the SID Trp:Lys ratio (LLH vs. LLL) reduced (P < 0.05) ADG and increased (P < 0.05) F/G. In Experiment 2, decreasing CP (HHH vs. LHH) did not affect ADG but increased (P < 0.05) F/G. Decreasing Lys (LHH vs. LLH) and the SID Trp:Lys ratio (LLH vs. LLL) decreased (P < 0.05) ADG and increased (P < 0.05) F/G. In Experiment 3, decreasing CP (HHH vs. LHH) or Lys (LHH vs. LLH) did not influence ADG or F/G. Decreasing the SID Trp:Lys ratio (LLH vs. LLL) reduced (P < 0.05) ADG and increased (P < 0.05) F/G. In Experiment 4, decreasing CP (HHH vs. LHH) did not influence ADG but increased (P < 0.05) F/G. Decreasing Lys (LHH vs. LLH) had no effect on performance, but decreasing the SID Trp:Lys ratio (LLH vs. LLL) reduced (P < 0.05) ADG and increased (P < 0.05) F/G. In conclusion, low-CP diets formulated 0.10 and 0.05 percentage units below the SID Lys requirement at the end of the experiment’s weight range appear to ensure pigs are below their Lys requirement when determining the optimal SID Trp:Lys ratio for 29- to 52-lb and 50- to 80-lb pigs, respectively. For pigs heavier than 80 lb, formulating diets at 0.05 percentage units below the SID Lys requirement at the end of the experiment’s weight range can limit the ability to provide statistical evidence that pigs are under their lysine requirement. en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Swine Day, 2014 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 15-155-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 1110 en_US
dc.subject Amino acid ratio en_US
dc.subject Lysine en_US
dc.subject Tryptophan en_US
dc.title Validating a dietary approach to determine amino acid:lysine ratios for pigs en_US
dc.type Conference paper en_US
dc.date.published 2014 en_US
dc.citation.epage 100 en_US
dc.citation.spage 83 en_US
dc.description.conference Swine Day, Manhattan, KS, November 20, 2014 en_US
dc.contributor.authoreid mtokach en_US
dc.contributor.authoreid dritz en_US
dc.contributor.authoreid jderouch en_US
dc.contributor.authoreid jwoodworth en_US
dc.contributor.authoreid goodband en_US


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