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Hormone analyses. (A) At 23 and 33 d of age, ducks showed significantly increased levels of circulating angiotensin II (AgII) and (B) corticosterone (CS) levels compared to ducks raised on pin-metered water lines suggesting negative osmotic homeostasis and stress, respectively. * = P < 0.05, ** = P < 0.01, *** = P < 0.001.
