Effects of age and concentrate feeding on the expression of MCT 1 and CD147 in the gastrointestinal tract of goats and Hereford finishing beef bulls

Monocarboxylate transporter 1 (MCT 1) necessary for the absorption of short chain fatty acids in the gastrointestinal tract, was measured in ventral wall of rumen, abomasum and duodenum of kids at age of 1 day and 1, 2 and 8 weeks. Samples from rumen, abomasum and duodenum were also taken from finishing beef bulls fed concentrate either ad libitum (A) or restrictively (R). Increased expression of MCT 1 was observed during the first week and parallel increases were found in its ancillary protein, CD147 in the rumen of kids. In duodenum, MCT 1 decreased with age and a similar tendency was seen in abomasum. In bulls, MCT 1 was higher in ventral wall and atrium than in other parts of gastrointestinal tract. However, in ventral wall of rumen MCT 1 was higher in A than in R. These findings show that MCT 1 increases with the development of rumen function and also in adult animals MCT 1 may change with the feeding.