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Dietary nano chromium picolinate can ameliorate some of the impacts of heat stress in cross-bred sheep

Animal Nutrition 2021年第1期7卷 198-205页

作者： Alex T.Hung Brian J.Leury Matthew A.Sabin fahri fahri Kristy DiGiacomo tu-fa lien.frank r.dunshea faculty of Veterinary and Agricultural Sciences The University of MelbourneParkvilleVIC3010Australia Murdoch Children's research Institute The University of MelbourneParkvilleVIC3010Australia Department of Animal Science National Chiayi UniversityChina faculty of Biological Sciences The University of LeedsLeeds LS29JTUnited Kingdom

Two studies were conducted to evaluate the effect of nano chromium picolinate(nCrPic)during heat stress(HS)in *** the initial study,36 Merino×Poll cross-bred sheep were individually penned and allocated to 3 dietary treatments(0,400 and 800μg/kg nCrPic)for 8 *** composition was determined at the beginning and end of the experiment using dual energy X-ray *** sheep remained in their dietary groups but were then placed in metabolic cages and randomly allocated within the dietary group to differing ambient temperature regimes,i.e.,thermo-neutral(TN)(n=18)and HS(n=18),for 3 *** nCrPic had no effect on growth performance and body composition during the initial study conducted under TN *** stress decreased average daily feed intake(ADFI)(P=0.002)whereas sheep under HS had reduced average daily gain(ADG)and indeed lost weight(Pry nCrPic increased both ADFI(P=0.041)and ADG(P=0.049)under both TH and HS conditions such that the performance of sheep receiving supplemental nCrPic and exposed to HS was similar to that of control sheep maintained under TN *** stress increased rectal temperature(Prespiration rate(Prticularly during the hottest parts of the day as indicated by interactions(Prmal *** temperature was lower in sheep fed nCrPic(P=0.050),particularly under peak HS conditions during the afternoon as indicated by the interactions between dietary nCrPic and time of day(Pry nCrPic,thermal treat-ment and time of day(P=0.010).Similarly,respiration rate was lower in sheep fed nCrPic under peak HS conditions during the afternoon as indicated by the interactions between dietary nCrPic and thermal treatment(Pry nCrPic and time of day(P=0.030).In conclusion,dietary nCrPic can partially ameliorate the negative effects of HS as indicated by the maintenance of ADFI and decreased physiological responses,such as elevatio

关键词： Chromium picolinate Sheep Heat stress Nanotechnology Physiology

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Nano-chromium picolinate and heat stress enhance insulin sensitivity in cross-bred sheep

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Animal Nutrition 2023年第2期13卷 173-184页

作者： Alex T.Hung Brian J.Leury Matthew A.Sabin fahri fahri Kristy DiGiacomo tu-fa lien.frank r.dunshea faculty of Veterinary and Agricultural Sciences The University of MelbourneParkvilleVIC 3010Australia Murdoch Children's research Institute The University of MelbourneParkvilleVIC 3010Australia Department of Animal Science National Chiayi UniversityChiayiChina faculty of Biological Sciences The University of LeedsLeeds LS29JTUnited Kingdom

This study evaluated the effects of heat stress(HS)and dietary nano chromium picolinate(nCrPic)on metabolic responses of sheep to an intravenous glucose tolerance test(IVGTT),an intravenous insulin tolerance test(ITT)and an intramuscular adrenocorticotropin hormone(ACTH)challenge in ***-six sheep housed in metabolic cages were randomly allocated within 3 dietary groups(0,400 and 800 mg/kg supplemental nCrPic)to either thermoneutral(22℃)or cyclic HS(22 to 40℃)conditions for 3 *** plasma glucose tended to be increased during HS(P=0.052)and decreased by dietary nCrPic(P=0.013)while plasma non-esterified fatty acid concentrations were decreased(P=0.010)by ***-etary nCrPic reduced the plasma glucose area under the curve(P=0.012)while there were no significant effects of HS on plasma glucose area under the curve in response to the *** plasma insulin response over the first 60 min after the IVGTT was decreased by HS(P=0.013)and dietary nCrPic(P=0.022)with the effects being *** response to the ITT plasma glucose reached a nadir sooner(P=0.005)in sheep exposed to HS,although there was no effect on the depth of the *** nCrPic decreased(P=0.007)the plasma glucose nadir after *** the duration of the ITT plasma insulin concentrations were lower in sheep exposed to HS(P=0.013)whereas there was no significant effect of supplemental *** was no effect of either HS or nCrPic on cortisol response to *** nCrPic supple-mentation decreased(P=0.013)mitogen-activated protein kinase-8(JNK)and increased(P=0.050)carnitine palmitoyltransferase 1B(CPT1B)mrNA expression in skeletal *** of this experiment demonstrated that animals under HS and supplemented with nCrPic had greater insulin sensitivity.

关键词： Chromium picolinate Sheep Heat stress Insulin sensitivity

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