Effect of live yeast supplementation on ruminal polysaccharidase activities in goats fed a high concentrate diet
Résumé
There is scarce information on the effect of yeast supplementation in dairy goats. The aim of this study was to determine the effect of live yeast supplementation on ruminal polysaccharidase activities in 12 mid-lactation goats receiving a high-concentrate diet. After three weeks of adaptation to the diet, six goats were yeast-supplemented (group Y) twice daily via rumen cannula during five weeks (10g/d, 2.2.1010 CFU/g Saccharomyces cerevisiae CBS 493.94, Alltech); the other animals were not supplemented (group C). Fibrolytic activity was lower in rumen contents after feeding than before and in nylon bags containing wheat than in those containing hay; the opposite results were obtained for amylolytic activity. Yeasts had no effect on amylase and xylanase activities in rumen contents or nylon bags and in cellulase activity in rumen contents, but tended (P = 0.07) to decrease cellulase activity in bag residues.