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Vitamin A and Carotene Absorption in the Guinea Pig¹

Washington Agricultural Experiment Station, Institute of Agricultural Sciences, Division of Home Economics, The State College of Washington, Pullman

Fasted guinea pigs were supplemented with either carotene or vitamin A (approximately 2,000 I.U.) and then sacrificed in one-half hour, 45 minutes, one hour, one and one-half hours, or two hours. The levels of vitamin A and carotene in the portal blood, systemic blood, and mesenteric lymphatics were determined.

1. Dosage with either vitamin A or carotene affected a rise in the vitamin A levels of the mesenteric lymphatics and the dorsal aorta blood.

2. Carotene absorption was found to be practically negligible when carotene was fed, but significant increases in vitamin A dorsal aorta blood and mesenteric lymphatic levels occurred.

3. The time of maximum absorption of vitamin A itself or vitamin A formed from the carotene fed, was at one hour after supplementation.

4. Portal absorption of either vitamin A or carotene could not be statistically demonstrated.

Manuscript received 25 October 1950.