Influence of nutritional status and oestradiol-17β on plasma growth hormone, insulin-like growth factors-I and -II and the response to exogenous growth hormone in young steers

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Abstract
Plasma GH profiles and circulating concentrations of plasma insulin-like growth factors-I and -II (IGF-I and -II) were examined in 20 steers on either high (3% dry matter of body weight per day) or low (1% dry matter of body weight per day) planes of nutrition with or without an implant of oestradiol-17β. The response of plasma IGF-I and -II to a bolus injection of bovine GH (bGH) was also investigated. Reduced feeding significantly (P P P P P r= 0·91, Pn = 20) and also between the capacity of the high-affinity hepatic somatotrophic receptor and plasma IGF-I (r= 0·89, P J. Endocr. (1988) 118, 243–250

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