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Effects of stress on the corticosterone content of the blood plasma and adrenal gland of intact and bursectomized Gallus domesticus.

The response of intact and bursectomized chicks to stressful stimuli has been examined. The stressors imposed were: a. fast-acting ACTH adminstration; b. immersion in cold water; c. starvation. In Bursa-intact chicks the results were as follows: 1. Plasma corticosterone was increased by all stimuli. 2. Adrenal corticosterone was decreased by ACTH treatment while it was increased by immersion in cold water and by starvation. 3. Plasma glucose was increased by ACTH administration and cold water immersion and decreased by starvation of the birds. 4. Adrenal ascorbic acid concentration was not influenced by all stimuli. 5. Adrenal weights were found to be increased by ACTH and starvation treatments only. 6. Bursa weights were increased by ACTH administration. 7. A very low concentration of corticosterone was found in the Bursa of Fabricius. Bursectomized chicks differed from the intact ones in the following: 1. Plasma and adrenal corticosterone concentrations were not increased by starvation. 2. Plasma glucose increased moderately with ACTH administration. 3. Adrenal ascorbic acid was depleted by all stimuli but was not related to the corticosterone level in the adrenals and blood plasma.