In two trials using cattle grazing green pasture, daily supplements of 1x106 IU vitamin A decreased plasma carotenoid (PC) concentration by 43- 58% over 28-31 days. Neither increasing the dose of vitamin A to 2.5 x 106 IU nor continuing the supplement for 83 days further reduced PC concentrations. These decreases in PC concentrations were not accompanied by decreases in carotenoid concentration in the subcutaneous fat or fat colour. This was possibly because PC concentration was still too high to allow a loss of carotenoids from the fat depots.
Proceedings of the New Zealand Society of Animal Production, Volume 56, , 193-194, 1996
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