Effects of heat stress on reproduction and productivity of primiparous sows and their piglets' performance

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Effects of heat stress on reproduction and productivity of primiparous sows and their piglets' performance

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/6460

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dc.contributor.advisor Lucy, Matthew C. (Matthew Christian), 1960- en_US
dc.contributor.advisor Safranski, Timothy Jon, 1965- en_US
dc.contributor.author Williams, Amanda M. en_US
dc.date.accessioned 2010-03-09T16:04:35Z
dc.date.available 2010-03-09T16:04:35Z
dc.date.issued 2009 en_US
dc.date.submitted 2009 Summer en_US
dc.identifier.other WilliamsA-080609-T516 en_US
dc.identifier.uri http://hdl.handle.net/10355/6460
dc.description Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 23, 2010). en_US
dc.description The 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. en_US
dc.description Thesis advisor: Drs. Matthew C. Lucy and Timothy J. Safranski. en_US
dc.description Vita. en_US
dc.description Includes bibliographical references. en_US
dc.description M.S. University of Missouri--Columbia 2009. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Animal sciences. en_US
dc.description.abstract Heat 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. en_US
dc.format.extent xii, 122 pages en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Sows -- Effect of stress on en_US
dc.subject.lcsh Sows -- Fertility en_US
dc.subject.lcsh Piglets -- Growth en_US
dc.subject.lcsh Piglets -- Development en_US
dc.title Effects of heat stress on reproduction and productivity of primiparous sows and their piglets' performance en_US
dc.type Thesis en_US
thesis.degree.discipline Animal sciences en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.oclc 540874400 en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2009 Theses
dc.relation.ispartofcollection 2009 Freely available theses (MU)


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