Effects of increasing CA:P ratio in diets containing phytase on finishing pig growth performance

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dc.contributor.author Hanni, S.M.
dc.contributor.author Barker, M.R.
dc.contributor.author Frantz, N.Z.
dc.contributor.author Groesbeck, C.N.
dc.contributor.author Keegan, T.P.
dc.contributor.author Hastad, C.W.
dc.contributor.author Tokach, Michael D.
dc.contributor.author Nelssen, Jim L.
dc.contributor.author DeRouchey, Joel M.
dc.contributor.author Goodband, Robert D.
dc.contributor.author Dritz, Steven S.
dc.date.accessioned 2009-11-09T22:44:32Z
dc.date.available 2009-11-09T22:44:32Z
dc.date.issued 2009-11-09T22:44:32Z
dc.identifier.uri http://hdl.handle.net/2097/2100
dc.description.abstract A total of 144 finishing pigs (72 barrows and 72 gilts, initially 85 lb) were used to determine the effects of calcium to total phosphorus (Ca:P) ratio in diets containing phytase on growth performance, carcass characteristics, and bone ash percentage. Pigs were housed in an environmentally regulated finishing building with two pigs per pen and six pens per sex per treatment in a randomized complete block design. Pigs were blocked by initial weight and sex, and then allotted to one of six dietary treatments. The dietary treatments were corn-soybean meal-based diets fed in three phases. In each phase, diets consisted of a 0.75:1; 1:1; 1.25:1; 1.5:1, and 2:1 Ca:P ratio. A sixth treatment group was a diet containing 77% of the total P as the other treatment diets. Diets were formulated to contain 0.44%, 0.39%, and 0.34% total phosphorus and 0.15%, 0.12%, and 0.07% available phosphorus from d 0 to 28, 28 to 57, and 57 to 76, respectively. All diets contained 0.05% phytase, providing 300 FTU/kg in order to achieve equivalent available phosphorus values of 0.23%, 0.19%, and 0.15%. For the overall experiment, increasing Ca:P ratio decreased (linear, P<0.03) ADG and F/G. However, the greatest decrease in ADG and F/G was observed when Ca:P ratio increased from 1.5:1 to 2:1. Daily feed intake was not affected by Ca:P ratio. There was no difference in backfat thickness for pigs fed Ca:P ratios between 0.75:1 and 2.0:1 (P<0.17). However, pigs fed the negative control diet had reduced backfat thickness (P<0.05) compared to the other pigs. Bone ash percentage was not affected (P<0.23) by Ca:P ratio. These results suggest that in finishing diets containing 300 FTU/kg phytase, a Ca:P ratio greater then 1.5:1 will decrease ADG and ADFI. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Swine day, 2003 en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 920 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 04-120-S en_US
dc.subject Calcium en_US
dc.subject Phosphorus en_US
dc.subject Phytase en_US
dc.subject Finishing pigs en_US
dc.subject Swine en_US
dc.title Effects of increasing CA:P ratio in diets containing phytase on finishing pig growth performance en_US
dc.type Conference paper en_US
dc.date.published 2003 en_US
dc.citation.epage 175 en_US
dc.citation.spage 171 en_US
dc.description.conference Swine Day, 2003, Kansas State University, Manhattan, KS, 2003 en_US
dc.contributor.authoreid mtokach en_US
dc.contributor.authoreid jnelssen en_US
dc.contributor.authoreid jderouch en_US
dc.contributor.authoreid goodband en_US
dc.contributor.authoreid dritz en_US


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