Saccharomyces cerevisae e monensina sódica em dietas de alto concentrado para bovinos

• Ano de defesa: 2009
• Autor(a) principal: Monnerat, João Paulo Ismério dos Santos
• Orientador(a): Paulino, Pedro Veiga Rodrigues
• Banca de defesa: Valadares, Rilene Ferreira Diniz , Valentim, Judson Ferreira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Acidose; Ácidos graxos voláteis; Confinamento
• Palavras-chave em Inglês: Acidosis; Volatile fatty acids; Confinement
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5803

The present work was developed to evaluate the effects of different levels of yeast culture supplementation in comparison to monensin and no feed additives on feed intake, nutrient digestibility, profile of volatile fatty acids (VFA) in the rumen, ruminal pH, concentration of ruminal ammonia, production of microbial protein, nitrogen excretion in urine and balance of nitrogen compounds in beef steers fed by high-concentrated diets with two levels of starch (23 and 38%). Eight steers cannulated in the rumen (Bos taurus x Bos indicus; BW: 489 kg body weight [BW]) were used. Animals were sorted out in two groups of four and each group received one kind of concentrate. The diet was composed of two rations including 80% of concentrated. The roughage used was corn silage and the concentrate composed of ground corn, soybean meal, cottonseed, soybean shell and mineral mixture. The experiment was evaluated following the two-by-two Latin Square design. Within each square, four treatments were implemented according to the supplementation plan (control, monensin, yeast 1.0 g/100kg BW/day, yeast 2.5 g/100kg BW/day). The diets with different levels of starch were independently applied in each Latin squares. The feed intake of non- fibrous carbohydrates, starch and dry matter were observed in relation to body weight and metabolic weight when the yeast level used was 1.0g/100 kg. The ruminal pH values were not influenced by the additive inclusion in the diets. However, the ruminal pH observed was lower (p<0.10) when the diet with a lowest level of starch was given. The VFA concentrations were higher (p>0.10) in the animals receiving a lowest level of starch, monensin and 1g of yeast. A lower concentration of lactate (P<0.10) were observed in the treatments which had monensin added and a higher level of starch. The concentrations of propionate, butyrate and N-NH3 were not influenced (P>0.10) by any of the additives used in this study. However, the propionate was positively influenced (P<0.10) by the treatment with a lower level of starch. A lower concentration of N-NH3 and a higher NDF digestibility coefficient was observed in the treatment with the lowest level of starch. All the additives used in this study improved (P<0.10) the digestibility of ether extract. The treatment with 2.5g of yeast showed better results compared to the others additives used in this study. The urinary excretion of the nitrogen compounds, purine derivatives, purine absorbed as purine derivatives, synthesis of microbial nitrogen, efficiency of microbial protein synthesis and balance of nitrogen compounds were not influenced by any of the treatments in this study.