Changes in plasma catecholamine and other physiological parameters under harmful conditions in laying hens
1996
Fujita, M. (Hiroshima Univ., Fukuyama (Japan). Faculty of Applied Biological Science) | Yamamoto, S.
In order to evaluate the stressive aspect of the layer management, plasma glucose, FFA, epinephrine and norepinephrine concentrations, and plasma monoamine oxidase activity, together with the thermoregulatory responses, were measured under ad lib. Feeding, 80% feeding, 60% feeding, immobilization and 35 degrees C heat exposure. Feed intake decreased to 79, 59, 76 and 59% from those of ad lib. Feeding under 80% feeding, 60% feeding, immobilization and heat exposure respectively. Respiration rate and body temperature significantly increased under heat exposure, and heart rate significantly increased under immobilization. Glucose concentration significantly increased under immobilization. FFA concentration significantly increased under immobilization and feed reductions. FFA concentration also tended to increase under heat exposure. Epinephrine concentration significantly increased under immobilization and feed reductions, and also tended to increase under heat exposure. Norepinephrine concentration significantly increased under immobilization and heat exposure, and tended to increase under feed reductions. The change in monoamine oxidase activity was not clear. The responses of circulating catecholamine relative to other physiological responses brings to a conclusion that, likewise immobilization, feed reduction and heat exposure would be the stress condition for laving hens
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