The effects of diets formulated on an ideal protein basis on growth performance and carcass characteristics of finishing gilts housed in a hot diurnal environment

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dc.contributor.author Lopez, J.
dc.contributor.author Jesse, G.W.
dc.contributor.author Spiers, D.
dc.contributor.author Becker, B.A.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Nelssen, Jim L.
dc.contributor.author Tokach, Michael D.
dc.date.accessioned 2010-02-11T22:38:57Z
dc.date.available 2010-02-11T22:38:57Z
dc.date.issued 2010-02-11T22:38:57Z
dc.identifier.uri http://hdl.handle.net/2097/2572
dc.description.abstract Forty-eight finishing gilts (initial weight = 155 ± 2 lb) were randomly assigned to one of eight experimental treatments in a 2 x 2 x 2 factorial arrangement with main effects including dietary lysine (.60 vs 1.00%), source of amino acid fortification (intact protein vs synthetic amino acids formulated on an ideal protein basis) and environmental temperature (thermoneutral (TN): 68°F vs hot, diurnal (HS): 82 to 95 °F). The ideal protein diets were formulated by using corn and soybean meal to meet the 5th limiting amino acid with additions of synthetic lysine, threonine, tryptophan, methionine, or isoleucine to meet the pigs estimated requirement. The ratios of other total amino acids relative to lysine were: threonine 66%, tryptophan 17%, methionine and cystine 56%, and isoleucine 63%. Average daily gain (ADG), average daily feed intake (ADFn, and feed efficiency (FIG) were similar for gilts fed the intact and ideal proteins diets. Increasing dietary lysine improved d 0-14 ADG and resulted in a numerical improvement for the overall study. Gilts in the HS environment ate less feed and had lower ADG than gilts at TN. A temperature X lysine interaction was observed for FIG. Increasing dietary lysine had no effect on FIG of gilts in the TN environment, but improved FIG of gilts in the HS environment. Carcass protein and lipid contents were improved for gilts in the HS environment and by increased dietary lysine. Accretion rates for protein and lipid, backfat thickness, and longissimus muscle area were improved in gilts fed 1.00% lysine. The source of amino acid fortification did not influence carcass characteristics. In conclusion, increased dietary lysine improved FIG and carcass leanness in gilts to a greater extent in HS than TN environments. However, no improvements were observed in growth performance or carcass traits from feeding ideal protein diets. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Swine day, 1992 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 93-142-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 667 en_US
dc.subject Swine en_US
dc.subject Pigs en_US
dc.subject Lysine en_US
dc.subject Growth en_US
dc.subject Heat stress en_US
dc.title The effects of diets formulated on an ideal protein basis on growth performance and carcass characteristics of finishing gilts housed in a hot diurnal environment en_US
dc.type Conference paper en_US
dc.date.published 1992 en_US
dc.citation.epage 143 en_US
dc.citation.spage 136 en_US
dc.description.conference Swine Day, Manhattan, KS, November 19, 1992 en_US
dc.contributor.authoreid goodband en_US
dc.contributor.authoreid jnelssen en_US
dc.contributor.authoreid mtokach en_US


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