Male chickens of two pure broiler breeder (S1 and S2) and a broiler cross line Ross 308 (BC) were reared from 0-35 days of age and were fed three dietary regimes with different lysine to apparent metabolizable energy (Lys/AME) ratios. Chickens were subjected to low ambient temperatures to stimulate the development of ascites. The objectives of the experiment was to evaluate effects of different ratios lysine to apparent metabolizable energy (Lys/AME) in diets, at different ages, on following indicators in metabolism for ascites susceptibility: arterial and venous blood gas pressures ( pa CO2, pv CO2, pa O2 and pv O2), heat production (Hp), plasma thyroid hormone concentrations (triiodothyronine, T3 and thyroxine, T4) and proportional organ weights (lung, liver and heart). Measurements were carried out at 2 and 5 wk of age. The ascites susceptible sire lines displayed, at different ages, marked higher pv CO2 and arterial pa CO2 values and lower plasma thyroid hormone concentrations compared to the less ascites susceptible BC line. The latter line showed heavier proportional lung weights (P
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