Effect of methionine:lysine ratio on growth performance and blood metabolites of growing-finishing pigs

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dc.contributor.author Kats, L.J.
dc.contributor.author Friesen, K.G.
dc.contributor.author Richert, B.T.
dc.contributor.author Owen, K.Q.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Nelssen, Jim L.
dc.contributor.author Tokach, Michael D.
dc.date.accessioned 2010-04-02T17:10:15Z
dc.date.available 2010-04-02T17:10:15Z
dc.date.issued 2010-04-02T17:10:15Z
dc.identifier.uri http://hdl.handle.net/2097/3481
dc.description.abstract Eighty growing-finishing pigs (40 barrows and 40 gilts) were used in three consecutive growth assays to determine the optimum methionine:lysine ratio for pigs weighing from 48 to 107 lb, 120 to 179 lb, and 191 to 245 lb, respectively. Each growth assay was to be conducted for a 28-d period with a 14-d transition period between assays. Pigs were allotted by weight and placed in pens each containing one barrow and one gilt. Pigs were assigned to one of eight experimental treatments with five replicate pens per treatment. Pigs were fed diets containing either high lysine (1.0, .9, or .8%, respectively) or low lysine (.8, .7, or .6%, respectively) with dietary methionine at 24.5, 28, 31.5, or 35% of lysine. This would correspond to total sulfur-containing amino acids (methionine + cystine) of 49, 56, 63, and 70% relative to lysine. During the first study (48 to 107 lb), average daily gain (ADG), average daily feed intake (ADFI), and feed efficiency (F/G) improved with increasing dietary lysine. Although no differences occurred in growth performance with increasing methionine ratio, there was a numeric improvement in growth performance for those pigs receiving diets containing 28% methionine relative to lysine. A lysine × methionine interaction was observed for blood urea N with pigs having the lowest BUN values observed with methionine at 24.5 and 31.5% of lysine for pigs fed .8 and 1.0% lysine, respectively. During phase II (120 lb to 179 lb), ADG improved with increasing dietary lysine and showed a linear response to increasing methionine ratio. Feed efficiency was also improved with increasing dietary lysine. For the third phase (191 to 245 lb), ADG also improved with increasing dietary lysine. There were no significant differences in feed intake; however, feed efficiency improved with increasing dietary lysine. In summary, because of high ADFI observed in these studies, the dietary methionine levels used closely met or exceeded the pig's requirement on a grams/day basis. Therefore, these data suggest that increasing dietary methionine does not improve pig performance. 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 Lysine en_US
dc.subject Methionine en_US
dc.subject Growth performance en_US
dc.subject Growing-finishing en_US
dc.title Effect of methionine:lysine ratio on growth performance and blood metabolites of growing-finishing pigs en_US
dc.type Conference paper en_US
dc.date.published 1993 en_US
dc.citation.epage 113 en_US
dc.citation.spage 109 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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