Metabolic activity of rumen microbiota and growth intensity of young sheep under the dietary influence of yeast supplements

The article presents the results of scientific research on the dietary effects of domestic probiotic and prebiotic preparations, based on baker's yeast Saccharomyces cerevisiae, on the metabolic activity of rumen microbiota and the growth intensity of fattening young sheep.Experimental studies were conducted at the sheep farm of the State Enterprise Research Farm "Hrusiatychi" (pre-Carpathian zone) of the Institute of Agriculture of the Carpathian Region of the NAAS of Ukraine.These studies involved two experiments: one with 1-2-monthold lambs during the stall period (February-March) and another with 7-8-month-old lambs during the pasture period (August-September), focusing on the Askanian meat-and-wool breed of sheep with crossbred wool.The research revealed that domestic biosupplements produced by the "Enzym" company (Lviv), probiotic "Enzymactive" (EA), and prebiotic "Inactivated Dry Glutathione Yeast" (IDGY), made from baker's yeast Saccharomyces cerevisiae, when added to compound feed in specified doses as part of compound feeds for feeding lambs during the stall and pasture periods of their growth, activate the reproduction and activity of rumen microorganisms, stimulate their proteinsynthesizing activity and enhance the growth intensity of animals.Based on metabolic and productive effects, the optimal supplementation for 1-2-month-old lambs in the stall period was a mixture of 0.4 % EA and 1.0 % IDGY of the compound feed's mass.For 7-8-month-old lambs during the pasture period, the best results were achieved with 0.8 % EA and 1.4 % IDGY supplementation.