The composition of animal manure is influenced by the diet fed. Efforts are made to decrease nitrogen emission from pig production by optimizing diet composition. This normally results in a lower proportion of N excreted in urine relative to faeces, and may also influence the turnover and utilization of manure N after field application. The effects of pig feed composition on the excretion of urinary and faecal N, on the dynamics of manure N in soil and on the potential utilization of manure N in the field was studied. Growing pigs and sows were fed 12 different diets with variable contents of fibre and protein (with or without synthetic amino acids). Slurries consisting of a mixture of faeces and urine were stored according to common agricultural practice in Northern Europe. The plant availability of N in the resultant slurries originating from animals fed known diets was tested in small field plots with barley, under conditions with minimal N losses. Separate plots were fertilized with increasing amounts of mineral N. Nitrogen uptake in barley was determined and the utilization of slurry N was compared with that of mineral fertilizer N. The net release of mineral N and C from the slurries in soil was also measured in a parallel incubation study. The mineral fertilizer equivalent of pig slurry N was 72-100% and significantly influenced by feed fibre composition, but not significantly influenced by the protein content. There was a significant positive correlation between enzyme-digestible organic matter in the pig diet (measurement used for feed evaluation) and the plant availability of pig slurry N (R2 = 0.90). The ammonium content of stored pig slurry could not be used.
\n for prediction of the N availability since the net mineralization of pig slurry N was variable, but there was a significant negative correlation between the pig slurry C\/N ratio and the plant availability of slurry N (R2 = 0.86). Increased dietary concentration of fermentable structural carbohydrates (e.g. by including sugar beet pulp in the diet) reduces the excretion of N in urine without affecting the availability of slurry total N, whereas an increased concentration of dietary fibre with a low fermentability (straw) results in less urinary N, but also a lower plant availability of slurry N.<\/p>\n","protected":false},"excerpt":{"rendered":"
The composition of animal manure is influenced by the diet fed. Efforts are made to decrease nitrogen emission from pig production by optimizing diet composition. This normally results in a lower proportion of N excreted in urine relative to faeces, and may also influence the turnover and utilization of manure N after field application. The […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[1809,8882,580,229,640,364,767,1972,3965,577,11602,1287,25122,313,1443,11013,6904,46,1594,1344,651,517,20792,169,1063,10859,187,11606,5665,14,18965,1635,1034,33,16262,17743,27282,2120,210,104,96,20911,4874,1579,13563,26223,18011,1213,21312],"class_list":["post-1586","post","type-post","status-publish","format-standard","hentry","category-environment","tag-acid","tag-al","tag-amino-acids","tag-ammonia","tag-animal","tag-barley","tag-compost","tag-condition","tag-content","tag-diet","tag-dietary-effects","tag-diets","tag-eet","tag-emission","tag-enzyme","tag-enzyme-in-sow-diet","tag-fee","tag-feed","tag-feed-composition","tag-fibre","tag-growing-pig","tag-growing-pigs","tag-influence","tag-manure","tag-mineral","tag-nat","tag-nitrogen","tag-of-pig-slurry","tag-optimizing","tag-pig","tag-pig-feed","tag-pig-production","tag-pig-slurry","tag-pigs","tag-pl","tag-prod","tag-production","tag-release","tag-slurry","tag-sow","tag-sows","tag-t","tag-tan","tag-test","tag-the-ammonium-content-of-stored-pig-slurry-could-not-be-used-for-prediction-of-the-n-availability-since-the-net-mineralization-of-pig-slurry-n-was-variable","tag-the-effects","tag-tot","tag-urine","tag-urine-content"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/1586","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=1586"}],"version-history":[{"count":1,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/1586\/revisions"}],"predecessor-version":[{"id":9215,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/1586\/revisions\/9215"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=1586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=1586"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=1586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}