A supplement containing multiple types of gluconeogenic substrates alters intake but not productivity of heat-stressed Afshari lambs

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dc.contributor.author Mahjoubi, E.
dc.contributor.author Amanlou, H.
dc.contributor.author Yazdi, M. H.
dc.contributor.author Aghaziarati, N.
dc.contributor.author Noori, G. R.
dc.contributor.author Vahl, Christopher I.
dc.contributor.author Bradford, Barry J.
dc.contributor.author Baumgard, L. H.
dc.date.accessioned 2017-02-14T22:49:36Z
dc.date.available 2017-02-14T22:49:36Z
dc.identifier.uri http://hdl.handle.net/2097/35126
dc.description Citation: Mahjoubi, E., Amanlou, H., Yazdi, M. H., Aghaziarati, N., Noori, G. R., Vahl, C. I., . . . Baumgard, L. H. (2016). A supplement containing multiple types of gluconeogenic substrates alters intake but not productivity of heat-stressed Afshari lambs. Journal of Animal Science, 94(6), 2497-2505. doi:10.2527/jas2015-9697
dc.description.abstract Thirty-two Afshari lambs were used in a completely randomized design with a 2 x 2 factorial arrangement of treatments to evaluate a nutritional supplement designed to provide multiple gluconeogenic precursors during heat stress (HS). Lambs were housed in thermal neutral (TN) conditions and fed ad libitum for 8 d to obtain covariate data (period 1 [P1]) for the subsequent experimental period (period 2 [P2]). During P2, which lasted 9 d, half of the lambs were subjected to HS and the other 16 lambs were maintained in TN conditions but pair fed (PFTN) to the HS lambs. Half of the lambs in each thermal regime were fed (top-dressed) 100 g/d of a feed supplement designed to provide gluconeogenic precursors (8 lambs in HS [heat stress with Glukosa {HSG}] and 8 lambs in PFTN [pair-fed thermal neutral with Glukosa]) and the other lambs in both thermal regimes were fed only the basal control diet (HS without Glukosa [HSC] and pair-fed thermal neutral without Glukosa). Heat stress decreased DMI (14%) and by design there were no differences between the thermal treatments, but HSG lambs had increased DMI (7.5%; P < 0.05) compared with the HSC lambs. Compared with PFTN lambs, rectal temperature and skin temperature at the rump, shoulder, and legs of HS lambs were increased (P < 0.05) at 0700 and 1400 h. Rectal temperature at 1400 h decreased for HSG lambs (0.15 +/- 0.03 degrees C; P < 0.05) compared with HSC lambs. Despite similar DMI between thermal treatments, ADG for HS and PFTN lambs in P2 was decreased 55 and 85%, respectively, compared with lambs in P1 (P < 0.01). Although the prefeeding glucose concentration was not affected by thermal treatment or diet, HSG lambs had increased postfeeding glucose concentration compared with HSC lambs (P < 0.05). In contrast to the glucose responses, circulating insulin was influenced only by thermal treatment; HS lambs had increased insulin concentration (P < 0.01) before feeding and decreased concentration (P < 0.05) after feeding compared with PFTN lambs. Heat-stressed lambs had decreased NEFA concentration before feeding (P < 0.01) but not after feeding relative to PFTN lambs. Although this nutritional strategy did not affect ADG, the lower rectal temperature in HSG lambs indicates that dietary inclusion of a mixture of glucogenic precursors can potentially benefit animal health during HS.
dc.relation.uri https://doi.org/10.2527/jas.2015-9697
dc.rights © 2016 American Society of Animal Science. All rights reserved. This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://www.sherpa.ac.uk/romeo/issn/1525-3163/
dc.subject Afshari Lamb
dc.subject Average Daily Gain
dc.subject Glucose Precursor
dc.subject Heat Stress
dc.subject Lactating Holstein Cows
dc.subject Dairy-Cows
dc.title A supplement containing multiple types of gluconeogenic substrates alters intake but not productivity of heat-stressed Afshari lambs
dc.type Article
dc.date.published 2016
dc.citation.doi 10.2527/jas.2015-9697
dc.citation.epage 2505
dc.citation.issn 0021-8812
dc.citation.issue 6
dc.citation.jtitle Journal of Animal Science
dc.citation.spage 2497
dc.citation.volume 94
dc.description.embargo 5/31/2017
dc.contributor.authoreid bbradfor
dc.contributor.authoreid vahl
dc.contributor.kstate Bradford, Barry J.
dc.contributor.kstate Vahl, Christopher

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