The influence of threonine:lysine ratios on growth performance and on plasma urea nitrogen in growing-finishing pigs fed from 85 to 240 lb

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dc.contributor.author Friesen, K.G.
dc.contributor.author Kats, L.J.
dc.contributor.author Owen, K.Q.
dc.contributor.author Richert, B.T.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Nelssen, Jim L.
dc.contributor.author Tokach, Michael D.
dc.date.accessioned 2010-04-02T17:10:27Z
dc.date.available 2010-04-02T17:10:27Z
dc.date.issued 2010-04-02T17:10:27Z
dc.identifier.uri http://hdl.handle.net/2097/3482
dc.description.abstract Eighty crossbred pigs (initially 85.2 lb BW) were used in a 2 × 4 factorial arrangement to determine the influence of dietary threonine:lysine ratios on growth performance and plasma urea N in growing-finishing pigs. The experiment was conducted in three phases from 85.2 to 124.2, 139.1 to 203.1, and 204.9 to 241.1 lb, with pigs fed one of eight dietary treatments. Two levels of dietary lysine were fed (low vs high) and four levels of dietary threonine were fed within each lysine treatment (60, 65, 70, and 75% of dietary lysine). Dietary lysine decreased from 1.0% and .8% at 85.2 to 124.2 lb to .9 and .7% at 139.1 to 203.1, then to .7 and .5% at 204.9 to 241 1 lb. Average daily gain (ADG) and feed efficiency (F/G) were not influenced by lysine or threonine treatment from 85.2 to 124.2 lb. However, average daily feed intake was decreased for pigs fed 1.0% dietary lysine compared to .8% dietary lysine. From 139.1 to 203.1 lb, an interaction between dietary lysine and threonine existed for ADG. Average daily gain was maximized at 65 and 70% of dietary lysine for pigs fed .7 and .9% dietary lysine, respectively. Conversely, ADFI and F/G were not influenced by threonine:lysine ratios. From 204.9 to 241.1 lb, ADG and ADFI were not influenced by dietary treatment. However, F/G was improved for pigs fed .7% dietary lysine compared to pigs fed .5% dietary lysine. Plasma urea N was increased at 124.2 and at 203.1 for pigs fed greater dietary lysine. At 241.1 lb, plasma urea N was decreased linearly at the percentage of threonine increased from 60 to 75% of lysine. The data from this experiment indicate that excess lysine and threonine intakes do not decrease growth performance. Because high ADFI resulted in high amino acid intake, growth performance was not influenced by the amino acid ratios used in this experiment. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Swine day, 1993 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 94-194-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 695 en_US
dc.subject Swine en_US
dc.subject Pigs en_US
dc.subject Lysine en_US
dc.subject Threonine en_US
dc.subject Growth performance en_US
dc.title The influence of threonine:lysine ratios on growth performance and on plasma urea nitrogen in growing-finishing pigs fed from 85 to 240 lb en_US
dc.type Conference paper en_US
dc.date.published 1993 en_US
dc.citation.epage 118 en_US
dc.citation.spage 114 en_US
dc.description.conference Swine Day, Manhattan, KS, November 18,1993 en_US
dc.contributor.authoreid goodband en_US
dc.contributor.authoreid jnelssen en_US
dc.contributor.authoreid mtokach en_US


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