Effects of growth hormone-releasing factor and feed intake on energy metabolism in growing beef steers: whole-body energy and nitrogen metabolism
Article Abstract:
The effect of growth hormone-releasing factor (GRF) on energy metabolism and nitrogen utilization at two feeding regimen was assessed to approximate the energy budget for basal metabolism and growth as well as energy allotted for protein and fat synthesis. Energy allotted for maintenance and growth were not affected by the administration of GRF. However, more energy for growth was channeled to protein synthesis rather than lipogenesis in GRF-treated steers. GRF also had slight effects on metabolizable and heat energy of steers indicating that it may have other effects on metabolism besides increasing growth hormone concentrations.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effects of growth hormone-releasing factor and feed intake on energy metabolism in growing beef steers: net hormone metabolism by portal-drained viscera and liver
Article Abstract:
The effects of growth hormone-releasing factor (GRF) and feed intake on the serum concentration and visceral metabolism of growth hormone (GH), insulin-like growth factor-I (IGF-I), somatostatin, glucagon and insulin were determined in six crossbred steers. Results showed that GRF elevated serum concentrations of insulin, IGF-I and GH independent of splanchnic metabolism. On the other hand, the elevation of arterial concentrations of insulin and glucagon resulting from the increase in feed intake was mediated by the hormones' release from portal-drained viscera.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effects of growth hormone-releasing factor and feed intake on energy metabolism in growing beef steers: net nutrient metabolism by portal-drained viscera and liver
Article Abstract:
Metabolism of carbon-based nutrients in the portal-drained viscera and liver was assessed to determine the effect of growth hormone-releasing factor (GRF) on nutrient metabolism of crossbred steers. Increasing the food intake elevated blood flow and mobilization of most nutrients. On the other hand, GRF administration decreased liver clearance of amino acid and ammonia nitrogen and the release of urea nitrogen. Nitrogen retention over the net amino acid assimilation of the gastrointestinal tract increased with the administration of GRF.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
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