STUDY OF THE RATE OF PASSAGE OF FOOD WITH CHROMIUM-MORDANTED PLANT CELLS IN CHICKENS (GALLUS GALLUS)

¹ Department of Physiology, Veterinary Faculty, Universidad Autónoma de Barcelona, Spain

Thirty broilers 8-10 weeks old were used to study the rate of food passage in chickens. Wheat bran and rice husks of three different sizes: more than 2 mm, between 1 and 1·5 mm, and less than 0·5 mm, mordanted with chromium, were used as markers. The suitability of these markers to study the rate of food passage in chickens and the possible influence of the size and hardness of the particle on the retention time was the objective of this study. Both T₁, the time of first appearance of the marker, and T_m, the mean retention time, have been evaluated. T_m was a better parameter than T₁ for studying transit time. T_m was longer with the biggest particles, especially with rice husk. The gizzard, with its grinding activity and pylorus, a selector of particle size, seems to be the transit regulator for solid particles in chickens. No chromium was found in the caecal contents of any case.

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