Growth Hormone and Prolactin Response to Thyrotropin Releasing Hormone and Growth Hormone Releasing Factor in the Immature Turkey

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Abstract
Synthetic TRH and human pancreatic growth hormone-releasing factor (hpGRF) stimulated growth hormone (GH) secretion in 6- to 9-wk-old turkeys in a dose-related manner. TRH and hpGRF (1 and 10 .mu.g/kg, respectively) each produced a 6-fold increase in circulating GH levels 10 min after i.v. injection. Neither TRH nor hpGRF caused a substantial change in prolactin (PRL) secretion in unrestrained turkeys sampled through intraatrial cannulas. Some significant increases in PRL levels, possibly related to stress, were noted.