Concentrations of vitamin A, β-carotene and vitamin E in individual bovine follicles of different quality
in ReproductionSummary. The degree of atresia of the follicle had no influence on the intrafollicular concentrations of β-carotene, vitamin E and cholesterol. This might result from the passive transfer of these substances from blood to follicular fluid bound to high density lipoproteins. However, concentrations of vitamin A in follicular fluid were significantly (P < 0·001) influenced by follicle quality, with highest concentrations (0·32 μg/ml) in non-atretic follicles and lowest values (0·15 μg/ml) in greatly atretic follicles. The higher concentrations of vitamin A in healthy follicles might be due to a local conversion of β-carotene into vitamin A in follicular structures. By influencing hormone and protein synthesis, vitamin A may have a potential for local modulation of follicular development and therefore be one of the factors controlling recruitment, selection and growth of the dominant follicle in cattle.
Keywords: follicular fluid; vitamin A; β-carotene; vitamin E; fertility; cattle
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Online ISSN: 1741-7899
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