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Effects of dietary propionate and heat exposure on insulin response to feeding in sheep



Effects of dietary propionate and heat exposure on insulin response to feeding in sheep



Japanese Journal of Zootechnical Science 58(12): 1086-1094



Sheep were fed lucerne hay alone or supplemented with calcium propionate (10 mmol/kg BW) and exposed to a thermoneutral (20.degree.C) or a hot environment (30.degree.C) in order to clarify effects of physiological level of propionic acid in the rumen and heat exposure on insulin secretion in response to feeding. Total volatile fatty acids (VFA) concentrations in the rumen increased after feeding, with a particularly sharp increase in propionic acid levels for the lucerne hay with calcium propionate diet. Plasma glucose concentrations after feeding were higher for the lucerne hay with calcium propionate diet than for the lucerne hay alone diet. Concentrations of plasma insulin for the lucerne hay alone diet responded to feeding biphasically, with a more rapid and marked response for the lucerne hay with calcium proprionate diet in both the environments. The concentrations of plasma insulin at the initial stage after feeding tended to be higher during heat exposure than under thermoneutral conditions for the lucerne hay alone diet. There was little difference in plasma glucose concentration between the environments. These results suggest that administration of a physiological dose of proprionic acid into the rumen causes insulin secretion in sheep. It is likely that plasma insulin level tends to be higher during heat exposure than in the thermoneutral environment but the insulin response to feeding did not differ between the environments under normal conditions.

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Accession: 001580419

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