Effect of polyethylene glycol on rumen volume and retention time of liquidand particulate matter along the digestive tract in goats fed tannin-rich carob leaves (Ceratonia siliqua)

The present work studied the effects of tannins in carob leaves (CL) on rum en volume and kinetics, and on the retention time of fluid and particulate components of the digesta along the gastrointestinal tract (GIT) in goats. The experimental design was a two factor crossover experiment, i.e. in phas e 1, two goats were fed CL and 2 CL and polyethylene glycol (PEG) and in ph ase 2, the treatments were switched. The main effects of tannins were depre ssion of the rumen fluid and particulate content of the rumen, acceleration of the passage of liquid from the abomasum, and delay of the passage of di gesta in the intestine. The overall effect was a delay in the passage of fl uid and particulate matter throughout the entire GIT. It is hypothesised th at these responses are largely the consequence of the interaction of tannin s with digestive enzymes and the epithelium lining of the digestive tract. (C) 2001 Elsevier Science B.V. All rights reserved.