The recommended daily lysine requirement\u00a0of non-pregnant sows at maintenance, 36 mg\/kg, was\u00a0estimated from research in the 1960\u2019s with growing pigs and sows.\u00a0The current estimate was hypothesized to be too low for modern, high\u00a0producing sows. \u00a0Non-pregnant Hypor Hybrid (Hypor Inc) sows (n=4; 222.6\u00b10.7 kg BW) were\u00a0adapted to 2.2 kg of a semi-synthetic diet containing 14.0 MJ ME\/kg and\u00a01.09 g\/kg lysine. Each sow received 6 test diets, in random order, providing\u00a0lysine intakes of 19.8, 25.2, 30.6, 41.4, 46.8 and 52.2 mg\/kg. After\u00a0adaptation to each diet, indicator amino acid oxidation using L-[1-13C]-PHE\u00a0was determined simultaneously with indirect calorimetry for 4 h. Plateaus in\u00a0oxidation were achieved within 1.5 h. PHE oxidation decreased as lysine\u00a0intake increased and was lowest (P<0.05) at 46.8 mg\/kg.\u00a0Heat production was linearly correlated (r2 = 0.54) with PHE\u00a0oxidation and was lowest (P<0.05) at lysine intake of 46.8 mg\/kg. The\u00a0mean RQ (1.029\u00b10.028) showed that dietary energy was not limiting. RQ was\u00a0also lowest (P<0.001) at lysine intake of 46.8 mg\/kg.\u00a0Maintenance lysine requirement, calculated by regression analysis, was\u00a049 mg\/kg. \u00a0The dietary lysine requirement for this population of sows was\u00a0determined to be 49 mg\/kg; this exceeds the current recommendation\u00a0by 30%.\u00a0HP and RQ were lowest when sows received adequate\u00a0intake of dietary lysine, demonstrating that energy metabolism was also most\u00a0efficient at this intake. Amino acid requirements of modern sows must be redetermined\u00a0during maintenance, gestation and lactation.<\/p>\n","protected":false},"excerpt":{"rendered":"
The recommended daily lysine requirement\u00a0of non-pregnant sows at maintenance, 36 mg\/kg, was\u00a0estimated from research in the 1960\u2019s with growing pigs and sows.\u00a0The current estimate was hypothesized to be too low for modern, high\u00a0producing sows. \u00a0Non-pregnant Hypor Hybrid (Hypor Inc) sows (n=4; 222.6\u00b10.7 kg BW) were\u00a0adapted to 2.2 kg of a semi-synthetic diet containing 14.0 MJ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18120,19],"tags":[1809,102,14,104],"class_list":["post-14995","post","type-post","status-publish","format-standard","hentry","category-ontario-pork","category-pork-insight-articles","tag-acid","tag-gestation","tag-pig","tag-sow"],"_links":{"self":[{"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/14995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=14995"}],"version-history":[{"count":2,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/14995\/revisions"}],"predecessor-version":[{"id":14999,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/14995\/revisions\/14999"}],"wp:attachment":[{"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=14995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=14995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=14995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}