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Response of bovine serum prolactin and growth hormone to duodenal, abomasal, and oral administration of thyrotropin-releasing hormone.

Thyrotropin-releasing hormone was injected into the duodenum of two 500-kg steers, placed into the abomasum of two prepubertal bulls, and fed to four bull calves (1 to 3 wk of age) to test the effect on concentrations of prolactin and growth hormone in blood serum. Before 20 and 200 mg of thyrotropin-releasing hormone were injected into the duodenum, prolactin in serum averaged 7.5 and 9.4 ng/ml and increased to 52.5 and 129.6 ng/ml at 45 and 35 min after treatment. Average growth hormone concentration of serum was increased also, but the response was more variable than prolactin. Peak concentrations of prolactin and growth hormone in blood serum were 5 to 10 times greater after treatment with thyrotropin-releasing hormone (40 mg/100 kg body weight into abomasum) than before treatment. Within 30 min after oral administration of thyrotropin-releasing hormone (0, .5, 1, and 2 mg/kg body weight) growth hormone concentration of serum was 30, 306, 356, and 317% greater than pretreatment. Prolactin concentration of serum, however, was increased in only one calf.