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Influence of Feeding on Growth Hormone Secretion and Response to Growth Hormone-releasing Factor in Sheep¹

Department of Animal Sciences, Iowa State University, Ames, IA 50011

This study was designed to examine the effects of feeding and factors associated with feeding on growth hormone (GH) secretion and response to growth hormone-releasing factor (GHRF) in sheep. Feeding reduced (P < 0.05) plasma GH concentrations to 60% of prefeeding concentrations within 45 min. Allowing the animals to anticipate being fed or artificial distention of the cranial sac of the rumen with a water-filled balloon did not significantly reduce plasma GH. Feeding, distention of the rumen and anticipation of being fed each reduced (P < 0.05) the GH response to intravenous injection of 0.067 µg GHRF/kg body weight. It is concluded that GH secretion is reduced within 15 min after feeding in ruminants and that part of the reduced secretion may be the result of reduced response to GHRF.

KEY WORDS: • ruminants • growth hormone • growth hormone-releasing hormone

¹ Journal Paper No. J-12149 of the Iowa Agriculture and Home Economics Experiment Station, Ames IA. Project No. 2644. This work was supported in part by a grant from the W. S. Martin Fund in the Alumni Achievement Office of Iowa State University.

Manuscript received 25 April 1988. Revision accepted 16 September 1988.