Importance of blood concentrations of metabolites and hormones for feeding and management in grazing beef cattle

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  • 放牧牛の飼養管理における血液成分濃度の有用性
  • ホウボクギュウ ノ シヨウ カンリ ニ オケル ケツエキ セイブン ノウド ノ ユウヨウセイ

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Abstract

The objective of this study was to evaluate whether nutritional status and growth could be estimated by plasma concentrations of metabolites and hormones in grazing beef cattle. Blood samples were collected once every two weeks from Japanese Shorthorn steers in growing (1st grazing season, n = 7) and fattening (2nd grazing season, n = 7) stages and analyzed for plasma concentrations of glucose, non-esterified fatty acid (NEFA), ghrelin, insulin, and insulin-like peptide 1 (IGF-1). A slight difference in plasma NEFA and ghrelin concentrations between the growing and fattening stages was observed. On the other hand, there were a lot of significant differences in plasma glucose, insulin, and IGF-1 concentrations between the two stages. In the final stage of grazing, body weight gain was negative, and plasma NEFA concentrations tended to increase in both stages. Plasma glucose concentrations and body weight gain were significantly lesser in the fattening stage than in the growing stage in the last half of grazing. Plasma insulin concentrations were significantly greater in the fattening stage than in the growing stage throughout grazing. Plasma IGF-1 concentrations were significantly greater in the fattening stage than in the growing stage in the first half of grazing. There was a positive correlation between plasma IGF-1 concentration and body weight in the growing stage. The present study suggests the importance of plasma concentrations of metabolites and hormones for estimating the nutritional status in grazing beef cattle. Plasma insulin and IGF-1 concentrations depend on the stages of growth. Therefore, plasma concentrations of metabolites and hormones in different stages of growth should be taken into consideration to estimate nutritional status in grazing beef cattle.

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