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dc.contributor.advisorLedoux, David R. (David Randolph), 1952-eng
dc.contributor.authorWalk, Carrieeng
dc.date.issued2006eng
dc.date.submitted2006 Summereng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on April 22, 2009)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (M.S.) University of Missouri-Columbia 2006.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Animal sciences.eng
dc.description.abstractThree experiments were conducted to evaluate the efficacy of high levels of microbial phytase in broiler diets. In experiment one (EXP 1), phytase was included in the diets at 0, 250, 500, 10,000, and 20,000 PU/kg diet. In experiments two and three (EXP 2 and 3), phytase was included in the diets at 0, 500, 2,500, 12,500, and 62,500 PU/kg diet. In all three experiments, dietary Ca and P were reduced to fit industry recommendations. In EXP 1, phytase supplementation improved (P [less than] 0.05) feed intake (FI), body weight gain (BWG), feed:gain (F:G), bone ash (BA), P digestibility (PD), and reduced (P [less than] 0.05) total litter P (TLP) by 53%. In EXP 2, phytase supplementation decreased (P [less than] 0.05) FI, had no effect (P [greater than] 0.05) on BWG, and improved (P [less than] 0.05) F:G, BA, and PD. In EXP 3, phytase supplementation decreased (P [less than] 0.05) FI, improved (P [less than] 0.05) BWG, F:G, BA, PD, and reduced (P [less than] 0.05) TLP by 33%. In young broilers (hatch to 21 days), high levels of dietary phytase improved BWG above the NRC and positive control diets (EXP 1 and 3). However, as broilers reached market weight there were no differences (P [greater than] 0.05) in BWG. Results of this research indicate that microbial phytase was efficacious in broiler diets. However, there were no added benefits to feeding high levels of dietary phytase (in excess of current recommendations) to broilers raised to market weight.eng
dc.identifier.merlinb67055485eng
dc.identifier.urihttp://hdl.handle.net/10355/4630eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subject.lcshPhytaseseng
dc.subject.lcshBroilers (Poultry) -- Feed utilization efficiencyeng
dc.subject.lcshBroilers (Poultry) -- Feeding and feedseng
dc.subject.lcshPhosphorus in animal nutritioneng
dc.titleEvaluation of the efficacy of high levels of microbial phytase in broilerseng
dc.typeThesiseng
thesis.degree.disciplineAnimal sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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