{"id":7876,"date":"2011-07-26T20:20:35","date_gmt":"2011-07-26T20:20:35","guid":{"rendered":"http:\/\/prairieswine.com\/rsc\/?p=7876"},"modified":"2011-12-02T10:29:55","modified_gmt":"2011-12-02T16:29:55","slug":"effect-of-dietary-protein-and-lysine-fluctuations-in-the-absence-and-presence-of-ractopamine-on-performance-and-carcass-quality-of-late-finishing-pigs","status":"publish","type":"post","link":"http:\/\/prairieswine.com\/rsc\/effect-of-dietary-protein-and-lysine-fluctuations-in-the-absence-and-presence-of-ractopamine-on-performance-and-carcass-quality-of-late-finishing-pigs\/","title":{"rendered":"Effect of dietary protein and lysine fluctuations in the absence and presence of ractopamine on performance and carcass quality of late-finishing pigs"},"content":{"rendered":"<p>Two experiments with finishing pigs were conducted to evaluate the effects of fluctuating dietary CP levels and ractopamine on performance and carcass traits. In Exp. 1, a total of 408 finishing pigs (mixed sex) were assigned to 1 of 4 protein regimens. Average initial and final BW were 89 and 123 kg, respectively. Pigs on treatments 1 to 4 were fed 16, 11, 16, and 13% CP from wk 0 to 2, respectively. From wk 2 to 5, the pigs on regimens 1 to 4 were then fed 15, 18.33, 18, and 20% CP, respectively, with regimens 3 and 4 also containing supplemental ractopamine (9.9 mg\/kg) from wk 2 to 5. Overall (wk 0 to 5), BW gain, G:F, loin depth, percentage of lean, and dressing percentage were improved in pigs on regimens 3 and 4 compared with those on regimens 1 and 2. No statistically significant overall (wk 0 to 5) protein sequence regimen differences occurred between the standard regimens (1 and 3) and the low-high CP regimens (2 and 4). Experiment 2 involved 172 finishing pigs (mixed sex) in 2 protein regimens. Average initial and final BW were 91 and 136 kg, respectively. The diets consisted of a control (16% CP from d 0 to 14, 18% CP + 4.95 mg of ractopamine\/kg from d 14 to 24, and 18% CP + 9.9 mg of ractopamine\/kg from d 24 to 35); and a low-high CP regimen (12.5% CP from d 0 to 14, 20.33% CP + 4.95 mg of ractopamine\/kg from d 14 to 24, and 20.33% CP + 9.9 mg of ractopamine\/kg from d 24 to 35). From d 0 to 14, pigs fed the low CP diet (12.5% CP) had reduced BW gain and G:F compared with those fed the control diet (16% CP). In contrast, from d 14 to 35, pigs on the low-high regimen had improved BW gain and G:F compared with pigs on the control regimen. Despite the wide dietary CP fluctuations for pigs in Exp. 2, performance and carcass traits were similar for both regimens over the 35-d test period. These data indicate that pigs fed deficient levels of CP and Lys for 14 d, followed by increased levels of CP and Lys during a subsequent 21-d period can recover and achieve growth performance and carcass merit equal to that achieved with a conventional protein feeding regimen.\u00a0<\/p>\n<p>For more information the full article can be found at <a href=\"http:\/\/jas.fass.org\/\">http:\/\/jas.fass.org\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Two experiments with finishing pigs were conducted to evaluate the effects of fluctuating dietary CP levels and ractopamine on performance and carcass traits. In Exp. 1, a total of 408 finishing pigs (mixed sex) were assigned to 1 of 4 protein regimens. Average initial and final BW were 89 and 123 kg, respectively. Pigs on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[930],"tags":[8882,10033,13816,2817,7957,231,577,1287,8782,6904,46,108,124,7756,175,20007,158,15846,16087,848,63,14,33,16262,816,95,3871,35,20911,4874,1579,26223,18011,52],"class_list":["post-7876","post","type-post","status-publish","format-standard","hentry","category-production","tag-al","tag-arc","tag-ass","tag-cla","tag-compensatory-growth","tag-cover","tag-diet","tag-diets","tag-effects-of-dietary-levels-of-ractopamineon-performance-and-carcass-merit-of-finishing-pigs","tag-fee","tag-feed","tag-feeding","tag-finishing","tag-finishing-pig","tag-finishing-pigs","tag-gh","tag-growth","tag-ideal-protein-pigs-carcass-quality","tag-low-cp","tag-lysine","tag-performance","tag-pig","tag-pigs","tag-pl","tag-protein-level","tag-quality","tag-ractopamine","tag-swine","tag-t","tag-tan","tag-test","tag-the-effects","tag-tot","tag-treatment"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/7876","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=7876"}],"version-history":[{"count":3,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/7876\/revisions"}],"predecessor-version":[{"id":10596,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/7876\/revisions\/10596"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=7876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=7876"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=7876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}