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Vitamin A deficiency in mallards was defined as hepatic levels of retinyl palmitate < 2 micrograms/g liver. Lesions were found only in ducks with low levels of hepatic vitamin A, but not all ducks with these low levels of hepatic vitamin A had histological lesions. ...M
…Vitamin A deficiency in mallards was defined as hepatic levels of retinyl palmitate < 2 micrograms/g liver. Lesions were found onl
…Vitamin A levels < 0.2 micrograms hepatic retinyl palmitate/g liver, occurred in 6% and 25% of male mallards sampled in 1991 to 19
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