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The objective was to assess the effect of the addition of Saccharomyces cerevisiae yeast culture in the feeding of cattle’s on in vitro digestibility and zootechnics performances. Sixteen Holstein cattle’s were randomly divided into two equal groups (8 cattle’s per group) during 147 days with 15 days of adaptation were used in this study according to age (14.8 ± 2.2 months and 15.3 ± 1.4 months respectively for control group (C) (group without yeast supply) and Yeast one (Y) (group receiving 28g live yeast /head/day)), initial body weight for the two groups (413 ± 21kg (Pr.>0.8)) at the beginning of trial. Cattle’s were either fed the same ration. Each cattle in the yeast group (Y) additionally received 28 g/head/day yeast of Saccharomyces cerevisiae in powder on the concentrate. Ration is composed of wheat straw (5kg DM/head/day) and concentrates (8kg DM/head/day). The weights are made every 2 weeks with a livestock weighing scale. The refusal quantities of wheat straw are also weighed each control. It is noted that the entire quantity distributed concentrate is ingested. A significant (P <0.01) increase in the mean total daily gain (ADGT) during the trial was noted (300) g / head. And a significant (P <0.01) increase in the final weight gain (FWG) of (36.4) kg / head for the (Y) group compared to the (C) group. Feed Intake does not differ with yeast intake. Voluntary feed intake increased for group (Y) at 8 th week until the end of trial but without significatif difference. For food conversion, it was similar for (Y) group and (C) group with around (2.61 ± 0.004, P >0.05), respectively.

journal of livestock science

Effect of live Saccharomyces cerevisiae supplementation on growth, intake and rumen fermentation features in Tunisian Holstein Friesian fattening cattle