Abstract
Variations in the plasma concentrations of immunoreactive glucagon, insulin, triiodothyronine (T3), thyroxine (T4), prolactin, and growth hormone (GH) have been determined in adult domestic ducks during 90 min of treadmill exercise (3° grade, 1.1 km/hr). Plasma glucagon and T3 concentrations were, respectively, increased (P < 0.05 in comparison with pretreatment and sedentary control levels) after 15 and 60 min of treadmill exercise and both remained elevated thereafter. The concentration of plasma glucagon progressively increased in the control birds and was higher (P < 0.05) than the pretreatment level after 60, 75, and 90 min. The concentration of plasma T4 was markedly reduced (P < 0.05) after 15 min of exercise and progressively declined throughout the period of exercise. A similar but lesser decline in the T4 concentration was also observed in nonexercised control birds. In both the exercised and control birds the plasma insulin level declined (P < 0.02) during the course of the study, although no significant difference in the insulin concentration was observed between the groups. Plasma concentrations of GH and prolactin were unaffected by treadmill exercise or by handling and blood sampling. The hormonal responses of ducks to exercise differ from those in mammalian species.
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