Turkish Journal of Veterinary & Animal Sciences




The objective of this study was to evaluate the effects of Saccharomyces cerevisiae as a probiotic on in situ ruminal DM, OM, CP and starch degradability values in some energy and protein sources commonly used in ruminant nutrition. In this study, the in situ degradation kinetics and fractions of dry matter, organic matter, crude protein, and starch of 6 different feedstuffs (barley, wheat, corn, sunflower seed meal, cottonseed meal and soybean meal) commonly used in animal nutrition were determined. Three ruminally cannulated Bafra sheep were used in the experiment. The experiment was designed as carryover experimental design with two periods. Each period of the experiment, samples were incubated for 0, 2, 4, 6, 8, 12, 24, and 48 h in the rumen of 3 sheep in duplicate. Degradation kinetics and fractions of DM, OM, CP, and starch were calculated. During the entire incubation period, the DM, OM, CP, and starch degradabilities and fractions of the feedstuffs significantly differed (p < 0.01), and the feed probiotic interaction was observed for all incubation hours for the ruminal DM, OM, CP, and starch degradabilities (p < 0.04). While the DM, OM, and CP degradabilities, except 48-h incubation, were affected by probiotic supplementation of diet, starch degradabilities were affected by probiotic supplementation of diet at all incubation hours. While the potentially degradable starch fractions of the feedstuffs generally increased due to the use of probiotics, it was observed that the nondegradable fractions significantly decreased (p < 0.01). It can be concluded that Saccharomyces cerevisiae significantly increased the ruminal DM, OM, CP degradations within the 12-h incubation period of all feeds, except corn. It was observed that the addition of Saccharomyces cerevisiae into diet increased the starch degradation values in the starch-rich cereal grains and soybean meal and affected starch fractions, especially by decreasing the water-soluble and nondegradable starch fractions and increasing the potentially degradable starch fraction.


Sheep, in situ degradation, Saccharomyces cerevisiae, starch

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