Effects of heat stress on carbohydrate and lipid metabolism in growing pigs

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dc.contributor.authorSanz Fernandez, M. Victoriaen
dc.contributor.authorJohnson, Jay S.en
dc.contributor.authorAbuajamieh, Mohannaden
dc.contributor.authorStoakes, Sara K.en
dc.contributor.authorSeibert, Jacob T.en
dc.contributor.authorCox, Lindsayen
dc.contributor.authorKahl, Stanislawen
dc.contributor.authorElsasser, Theodore H.en
dc.contributor.authorRoss, Jason W.en
dc.contributor.authorIsom, S. Clayen
dc.contributor.authorRhoads, Robert P.en
dc.contributor.authorBaumgard, Lance H.en
dc.contributor.departmentAnimal and Poultry Sciencesen
dc.date.accessioned2017-01-12T20:21:23Zen
dc.date.available2017-01-12T20:21:23Zen
dc.date.issued2015-02-01en
dc.description.abstractHeat stress (HS) jeopardizes human and animal health and reduces animal agriculture productivity; however, its pathophysiology is not well understood. Study objectives were to evaluate the direct effects of HS on carbohydrate and lipid metabolism. Female pigs (57 ± 5 kg body weight) were subjected to two experimental periods. During period 1, all pigs remained in thermoneutral conditions (TN; 20°C) and were ad libitum fed. During period 2, pigs were exposed to: (1) constant HS conditions (32°C) and fed ad libitum (n = 7), or (2) TN conditions and pair-fed (PFTN; n = 10) to minimize the confounding effects of dissimilar feed intake. All pigs received an intravenous glucose tolerance test (GTT) and an epinephrine challenge (EC) in period 1, and during the early and late phases of period 2. After 8 days of environmental exposure, all pigs were killed and tissue samples were collected. Despite a similar reduction in feed intake (39%), HS pigs tended to have decreased circulating nonesterified fatty acids (NEFA; 20%) and a blunted NEFA response (71%) to the EC compared to PFTN pigs. During early exposure, HS increased basal circulating C-peptide (55%) and decreased the insulinogenic index (45%) in response to the GTT. Heat-stressed pigs had a reduced T3 to T4 ratio (56%) and hepatic 5'-deiodinase activity (58%). After 8 days, HS decreased or tended to decrease the expression of genes involved in oxidative phosphorylation in liver and skeletal muscle, and ATGL in adipose tissue. In summary, HS markedly alters both lipid and carbohydrate metabolism independently of nutrient intake.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.14814/phy2.12315en
dc.identifier.issue2en
dc.identifier.urihttp://hdl.handle.net/10919/74291en
dc.identifier.volume3en
dc.language.isoenen
dc.relation.urihttp://www.ncbi.nlm.nih.gov/pubmed/25716927en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectEpinephrine challengeen
dc.subjectglucose tolerance testen
dc.subjectheat stressen
dc.subjectmetabolismen
dc.subjectthyroid hormonesen
dc.titleEffects of heat stress on carbohydrate and lipid metabolism in growing pigsen
dc.title.serialPhysiological Reportsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/Animal and Poultry Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Faculty of Health Sciencesen

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