Plasma growth hormone concentrations during growth in turkeys

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Abstract
1. The concentrations of circulating GH were low in 1‐week‐old birds (male plasma pool 30 ng/ml, female 32 ng/ml), reached a maximum at 7 weeks in male birds (142 ± 26 SEM ng/ml) or 4 weeks in females (185 ± 32 ng/ml) and then decreased to 17.3 ± 2–8 ng/ml in males and 8∗7 ± 0–6 ng/ml in females at 17 weeks. 2. Significant inverse correlations between GH concentration and age or body weight were found (male, r = —0–693), female, r = —0–623). 3. In males, but not females, the weekly increase in body weight was correlated with the plasma GH concentration (r = 0–291).