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Growth, protein synthesis and plasma concentrations of growth hormone, thyroxine and triiodothyronine in dwarf, control and growth-selected strains of broiler-type domestic fowl

1986; Elsevier BV; Volume: 83; Issue: 4 Linguagem: Inglês

10.1016/0300-9629(86)90701-2

0300-9629

Thomas J. Lauterio, Eddy Decuypere, Colin G. Scanes,

Biochemical effects in animals

1. Body weight, tissue weight and plasma hormone concentrations were determined at 1, 3, 6, 12 and 21 weeks of age in two dwarf strains and one control strain of broiler chickens. 2. Protein synthesis, accretion and degradation rates were determined in the control strain with age. 3. Within each strain, plasma growth hormone (GH) concentrations were greater at 1 and 3 weeks of age and consequently decreased with age. 4. Plasma GH concentrations were greater in the sex-linked dwarf chicken during pubescence and maturity (12 and 21 weeks) compared to the autosomal dwarf and control chickens. 5. Circulating concentrations of 3,5,3' triiodothyronine (T3) were depressed by 70% in sex-linked dwarf birds compared to controls, while thyroxine concentrations did not differ at most time points. 6. These findings support the suggestion that sex-linked dwarf chickens have reduced peripheral conversion of T4 to T3.