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Journal of Animal Science, Vol 70, Issue 9 2901-2910, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Insulin-like growth factors and binding proteins in ruminants and their nutritional regulation

M. A. McGuire, J. L. Vicini, D. E. Bauman and J. J. Veenhuizen
Department of Animal Science, Cornell University, Ithaca, NY 14853.

Insulin-like growth factors (IGF) are important mediators of growth, lactation, reproduction, and health. Considerable information on their role in ruminant animals has been learned in the past several years, but the precise mechanisms of their action are not known. The exact biological response of target cells is undoubtedly determined by the developmental state of the cell and synergism with other growth factors. Overall, somatomedins and their binding proteins seem to be major links between cellular developmental processes and nutrient supply. The mechanism by which nutrients control biological actions of somatomedins is not known but clearly involves the synthesis of IGF, as well as their binding proteins and receptors. In ruminants, severe feed restriction decreases circulating concentrations of IGF-I, whereas subtle alterations typical of those that occur in production systems have minimal effect. However, the responses of IGF to somatotropin are affected by modest alterations in nutritional status, including differences in nutritional status that are typically encountered in animal production systems.


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Copyright © 1992 by the American Society of Animal Science.