Strategies to Reduce Fecal Phosphorus Excretion in the Broiler Industry Without Affecting Performance

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dc.contributor.advisor J. T. Brake, Committee Chair en_US
dc.contributor.advisor J. A. Osborne, Committee Member en_US
dc.contributor.advisor J. C. Allen, Committee Member en_US
dc.contributor.advisor J. W. Spears, Committee Co-Chair en_US
dc.contributor.advisor R.O. Maguire, Committee Member en_US Plumstead, Peter William en_US 2010-04-02T19:09:03Z 2010-04-02T19:09:03Z 2007-07-04 en_US
dc.identifier.other etd-01202007-145115 en_US
dc.description.abstract Total phosphorus (P) in broiler manure has been reduced by decreasing dietary non phytate P (NPP) in combination with added phytase or low phytate (LP) grains. However, few studies have investigated the effects of diet amendment on performance and P excretion from broiler breeders, while the reported effects on water soluble P (WSP) from broilers have been inconsistent. To address this, broiler breeders were fed reduced NPP diets and phytase during the rearing (10-21 wk) and laying (22-64 wk) phase (Chapter 1). Decreasing dietary NPP below 0.37% reduced fertility, which was hypothesized to result from insufficient P intake during rearing. Decreasing NPP in breeder laying diets to 0.19% (no phytase) or 0.09% (with phytase) had no effect on eggs or chicks produced, but reduced manure total P and WSP by 39 to 42%, respectively. Chapters 2, 3, and 4 investigated reduced available P (AvP), phytase, phytate level, and the calcium (Ca):AvP or Ca:NPP ratios in broiler diets on ileal P and amino acid (AA) absorption, P retention, and total P and WSP in manure. Reduced AvP and phytase decreased manure total P. However, manure WSP and the ratio of WSP:total P were controlled by the dietary Ca:AvP ratio. Effects of Ca:AvP on WSP were dependent on the initial dietary phyate level and were mediated by altered phytate hydrolysis, precipitation of CaP complexes and urinary P output. Including LP soybean meal (SBM) in diets decreased total P and WSP by 49% and 56%, respectively, while phytase increased the WSP:total P ratio in manure. Maximum P retention and minimum total P output occurred when the dietary Ca:NPP ratio was 2.34:1 and 2.53:1 in LP and high phytate (HP) SBM diets, respectively. Dietary Ca had no effect on amino acid (AA) absorption in HP SBM but decreased AA absorption in LP SBM diets when Ca was >0.93%. Therefore, while a wider Ca:NPP ratio could decrease manure WSP, this may negatively affect AA absorption when diets contain LP SBM. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject broiler breeder en_US
dc.subject broiler en_US
dc.subject phosphorus en_US
dc.subject phytate en_US
dc.subject manure en_US
dc.title Strategies to Reduce Fecal Phosphorus Excretion in the Broiler Industry Without Affecting Performance en_US PhD en_US dissertation en_US Poultry Science en_US

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