Abstract
This study examined the pulsatile presence of growth hormone (GH) in the plasma—which reflects its pulsatile release—of 8-week-old male sex-linked dwarf (dwdw) or normal-sized (Dwdw) chickens from a brown-egg layer strain reared on a control or on a 0.5 ppm triiodothyronine(T 3)-supplemented diet. The overall GH mean, amplitude, and baseline levels of control dw chickens were significantly higher than those of control Dw chickens. No differences in peak length or peak frequency between genotypes were observed. Dietary T 3 supplementation abolished the pulsatile GH release in both genotypes. T 3 treatment depressed the mean GH levels of Dw but not of dw chickens.
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