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dc.contributor.advisorLucy, Matthew C. (Matthew Christian), 1960-eng
dc.contributor.advisorSafranski, Timothy Jon, 1965-eng
dc.contributor.authorWilliams, Amanda M.eng
dc.date.issued2009eng
dc.date.submitted2009 Summereng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on Feb 23, 2010).eng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.eng
dc.descriptionThesis advisor: Drs. Matthew C. Lucy and Timothy J. Safranski.eng
dc.descriptionVita.eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionM.S. University of Missouri--Columbia 2009.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Animal sciences.eng
dc.description.abstractHeat stress (HS) produces seasonal infertility in sows and decreases reproductive efficiency. Sows were exposed to HS during a production cycle (gestation [gest], lactation [lact], and breeding) to examine productivity. First parity Landrace/Large White F1 sows rotated through chambers in the Brody Environmental Center for 55 d. The ambient temperature sequences included thermoneutral (TN; 18 to 20°C) or HS (24 to 30°C) for each production phase (TN-TN-TN [n=15], TN-HS-TN [n=14], HS-TN-HS [n=14] or HS-HS-HS [n=15] for gest-lact-breeding [20, 24, and 11 d, respectively]). Thermal responses, body weight (BW), backfat (BF), loin eye area (LEA), feed intake (FI), metabolites, energy balance, piglet weights, and reproductive performance were measured. Rectal temperature differed (38.33 and 38.22, 39.47 and 39.22, 38.79 and 38.74°C (SEM [lesser than] 0.05) for HS and TN during gest, lact, and breeding, respectively; P [lesser than] 0.001). During lact TN sows had greater daily FI than HS sows (3.75 vs. 3.12 kg; P [lesser than] 0.001). Total born (11.7 pigs), piglet birth weight (1.46 kg) and total weaned (10.3 pigs) were similar, but weaning weight was greater for TN sows (6.21 vs. 5.76 kg; P [lesser than] 0.053). Weaning to estrus interval (4.70 d), percentage inseminated sows after weaning (85.7%), subsequent farrowing rate (82.6%) and subsequent total born (10.8 pigs per litter) were not different by treatment. In summary, HS decreased FI during lact and was associated with reduced piglet growth. Breeding performance was not compromised by HS. To conclude, HS slowed piglet growth perhaps through its effects on sow milk production without affecting sow breeding performance.eng
dc.format.extentxii, 122 pageseng
dc.identifier.oclc540874400eng
dc.identifier.otherWilliamsA-080609-T516eng
dc.identifier.urihttp://hdl.handle.net/10355/6460eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subject.lcshSows -- Effect of stress oneng
dc.subject.lcshSows -- Fertilityeng
dc.subject.lcshPiglets -- Growtheng
dc.subject.lcshPiglets -- Developmenteng
dc.titleEffects of heat stress on reproduction and productivity of primiparous sows and their piglets' performanceeng
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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