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2. Vitamins and immunity;Bendich;J. Nutr.,1992
3. Biochemistry;Bhagavan,1978
4. Antioxidant status of dairy cows supplemented prepartum with vitamin E and selenium;Brzezinska-Slebodzinska;Fed. Am. Soc. Exp. Biol. J.,1992
5. Endocrinological changes of pregnancy;Casey,1985