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The effects of meal ingestion on the circulating concentrations of the growth-regulating hormones thyroxine (T₄), tri-iodothyronine (T₃) and insulin were examined in weanling Thoroughbreds fed 70% (diet A), 100% (diet B) or 130% (diet C) of their energy and protein requirements. Peak insulin concentrations occurred 1, 2 and 3 h after the ingestion of diets C, B and A respectively. Increases in plasma glucose concentrations preceded the increases in serum insulin concentrations. Serum T₄ concentrations increased after the ingestion of diets A and B and decreased after diet C. In contrast, serum T₃ concentrations were unaffected by ingestion of diet A but increased after the ingestion of diets B and C. The increase was much greater and more rapid in the horses fed diet C. However, the decrease in T₄ concentration was five times greater than the increase in T₃ concentration. Accelerated insulin secretion after the ingestion of a meal high in energy (carbohydrate) content was therefore associated with decreased T₄ secretion and accelerated T₄ conversion to T₃. However, 6 months later serum T₄ and T₃ concentrations were unaffected by meal ingestion.

J. Endocr. (1985) 104, 93–98

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