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dc.contributor.authorShim, Mi Yeon
dc.date.accessioned2014-03-04T19:00:17Z
dc.date.available2014-03-04T19:00:17Z
dc.date.issued2010-12
dc.identifier.othershim_mi-yeon_201012_phd
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/shim_mi-yeon_201012_phd
dc.identifier.urihttp://hdl.handle.net/10724/27006
dc.description.abstractFast growing broiler chickens are especially susceptible to bone abnormalities, causing major problems for broiler producers. In this research, the impacts of environmental (incubation temperature), nutritional (Fluoride) and genetic (random-bred population) factors were studied. It would be of great benefit to manipulate the development of leg bone by making simple changes to incubation temperature such that chickens are better able to reduce the incidence of abnormalities. No main effects or interactions between incubation temperature or time and bone abnormalities were detected. However, It is important to note that eggs hatched at different times in our study. As little as 1ºC for 3 days during early incubation ED 4 – 7 affected hatching time and weight, confounding results. Fluoride (F) has been shown to have varying degrees of beneficial effects on bone mineralization and strength, despite its toxic effects on growth and leg disorders. Some studies have demonstrated an increase in bone ash due to F supplementation. Even low levels of F like those used here have the potential to create measurable effects. Experiments were also conducted to test the hypothesis that fast growing (FG) broiler chickens are susceptible to bone abnormalities, causing major leg problems. Growth rate was negatively associated with the twisted legs syndrome and a bone abnormality (TD) in a random-bred population. After all parameters were calculated per unit of final body weight at 6 wks, tibia density and bone ash percent of FG broiler chickens were lower than those of SG broiler chickens.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectIncubation temperature
dc.subjectBroiler
dc.subjectHatchability
dc.subjectTibial dyschondroplasia
dc.subjectRickets
dc.subjectFluoride
dc.subjectBW gain
dc.subjectBone ash
dc.subjectValgus
dc.subjectVarus
dc.subjectArkansas randombred
dc.subjectShank
dc.subjecttibia
dc.subjectDrum stick
dc.subjectTibia breaking strength
dc.subjectTibia mineral density
dc.subjectTibia mineral content
dc.titleLeg problems of modern broilers as affected by incubation temperature, fluoride and fast growth
dc.typeDissertation
dc.description.degreePhD
dc.description.departmentPoultry Science
dc.description.majorPoultry Science
dc.description.advisorGene Pesti
dc.description.committeeGene Pesti
dc.description.committeeAbhyuday Mandal
dc.description.committeeLynne Billard
dc.description.committeeMichael Azain
dc.description.committeeSammy Aggrey


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