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A. J. Bermudez, D. E. Swayne, M. W. Squires, M. J. Radin, Effects of Vitamin A Deficiency on the Reproductive System of Mature White Leghorn Hens, Avian Diseases, Vol. 37, No. 2 (Apr. - Jun., 1993), pp. 274-283
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Bermudez et al. (1993) studied this question.
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