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Absorption and Excretion of Cholecalciferol and of 25-Hydroxycholecalciferol and Metabolites in Birds¹

Arie Bar, Matitaho Sharvit, Dina Noff^*, Samuel Edelstein^* and Shmuel Hurwitz

Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan ^* Biochemistry Department, The Weizmann Institute of Science, Rehovot, Israel

The absorption and excretion in vivo of cholecalciferol or 25-hydroxycholecalciferol (25-HCC) were determined in chicks (Gallus domesticus) and turkeys (Meleagris gallopavo). The overall net cholecalciferol or 25-HCC absorption in chicks and cholecalciferol in turkey poults was 66.5 ± 3.3, 74.9 ± 3.7 and 83.6 ± 7.1% of the intake, respectively. The absorption of cholecalciferol or 25-HCC in chicks and turkeys occurred at the upper part of the intestine. 25-HCC, esters and non-polar metabolites of cholecalciferol or 25-HCC, and their polar metabolites, were secreted in the duodenum of chicks and turkeys but were partially reabsorbed at the upper part of the jejunum.

KEY WORDS: • cholecalciferol absorption • 25-hydroxycholecalciferol absorption • chick • turkey

¹ Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. No. 248-E, 1979 series. The research was supported by the Poultry Marketing Board of Israel.

Manuscript received 26 December 1979.