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The Site of Calcium Absorption in the Horse¹

New York State Veterinary College and New York State College of Agriculture, Cornell University, Ithaca, New York 14850

The site of calcium absorption in the horse was studied by the following techniques: 1) comparison of the degree of absorption of ⁴⁷Ca deposited directly in a fistulated cecum versus that absorbed from an intragastric dose; 2) estimating apparent absorption in various regions of the intestinal tract, using Cr₂O₃ as an unabsorbable marker; 3) comparison of the degree of absorption of ⁴⁷Ca from in vivo intestinal sacs of duodenum, ileum, cecum and colon. The upper part of the small intestine appeared to have the greatest calcium absorptive potential and to be the major effective site of net calcium absorption. However, the lower portion of the small intestine may also be a site of significant calcium absorption. Relatively little calcium was absorbed from the large intestine.

² Equine Research Program.

³ Department of Physical Biology.

⁴ Department of Animal Science.

Manuscript received 11 May 1970.