Effect of the enzymatic hydrolyzate of Saccharomyces cerevisiae yeast on the kinetics of ruminal degradation of nutrients of Cenchrus purpureus cv. OM - 22 (Cenchrus purpureus x Cenchrus americanus) forage

Abstract

In order to determine the effect of the enzymatic hydrolyzate of Sacharomyces cerevisiae yeast on the kinetics of rumen degradation of nutrients of Cenchrus purpureus cv. OM - 22 from the forage of, four Holstein cows were used, cannulated in rumen which intake fresh forage at will and commercial concentrate, offered once a day, according to a 4 x 4 Latin square design. The treatments were: Control (forage + 2 kg commercial concentrate) and treatments 2, 3 and 4 (forage + 2 kg commercial concentrate + 50 mL, 100 mL or 150 mL of hydrolyzate.kg of concentrate.day-1, respectively). The best use of the forage was obtained in the treatment with 150 mL of hydrolyzate, with the maximum degradation (P <0.0001) of the DM, OM, NDF and ADF in all incubation time. However, after 48 hours it did not differ from the treatment with 100 mL of hydrolyzate. There was a tendency to increase fraction B, the potential degradability and the degradation rate of nutrients, with the increase in the amount of hydrolyzate in the diet. An increase in the ruminal Effective Degradability was observed, which fluctuated between 41.44 and 56.44 % for the DM of the evaluated forage, between 38.87 and
56.70 % for the OM, 33.55 and 48.92 % for the NDF and 25.79 and 44.44 % for the ADF. It is concluded that the addition of the hydrolyzate had a positive effect on the kinetics of ruminal degradation of the forage. It is recommended the use of 100 mL level of enzymatic hydrolyzate. kg of concentrate. day-1 in ruminants which consume diets with high fiber content.
Key words: zootechnical additive, degradation rate, ruminal degradability, fibrous diet