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Published online by Cambridge University Press: 24 November 2017
Circulating concentrations of insulin-like growth factor-1 (IGF-1) are closely related to the nutrition of animals and their rates of growth. The major site of IGF-1 production is thought to be the liver. Whilst growth hormone (GH) is thought to be the main regulator of IGF-1 production in farm animals, in laboratory rats, altering the GH status of the animal (without hyperphysectomy) has little influence on circulating IGF-1 levels. A series of studies have been conducted with primary cultured rat and sheep hepatocytes to investigate the influence of GH and nutrient availability on the production of IGF-1 by liver cells.