Inclusão do produto da fermentação de levedura na dieta sobre o desempenho e metabolismo ruminal de vacas leiteiras

• Ano de defesa: 2014
• Autor(a) principal: Dias, André Luiz Garcia
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Programa de Pós-Graduação em Zootecnia; UEM; Maringá, PR; Centro de Ciências Agrárias
• Palavras-chave em Português: Vacas leiteiras; Levedura; Dieta; Desempenho; Metabolismo; Distúrbio ruminal; Fermentação ruminal; Ph do rúmen; Saccharomyces cerevisiae; Brasil.; rumen pH, subacute ruminal acidosis, ruminal fermentation, Saccharomyces cerevisiae; Brazil.; Ciências Agrárias; Zootecnia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/1574

Highstarch levels in diets of dairy cows can promote ruminal acidosis, what will decrease feed intake, milk yield and milk fat yield. The yeast inclusion in the lactating cows diets have being used commercially to reduce the effects caused by feeding with high level of concentrate food. The objective of this study was to evaluate the inclusion effects of the 15 per day of yeast (Saccharomyces cerevisiae) fermentation product inclusion in lactating cow' diet receiving two levels of starch on performance, blood, and ruminal parameters. Also, was inducted a subacute ruminal acidosis to determine if the yeast fermentation product (YFP)is efficient to reduce the ruminal acidosis effects. The treatments were with or without YFP addiction in the diets with two levels of starch (23 and 29%). There were measured the feed intake, milk yield and composition, the glucose, NEFA, ureic N, and haptoglobin levels in the blood, the ruminal pH, ruminal and total digestibility, as well as the flux of microbial protein between rumen and omaso. There was not difference in the dry matter intake between the treatments, but the YFP increased the milk yield and the FCM yield until 3.3 kg/d compared to control. There were increases in the milk fat, protein, and lactose and in the crude protein digestibility for the animals receiving YFP. The high starch increased milk protein and glucose plasmatic and decreased ureic N plasmatic and ruminal digestibility and pH. The interaction between YFP and high starch level in the diet increased ruminal NDF digestibility, flux of microbial protein to omaso, and ruminal pH. In conclusion the Saccharomyces cerevisiae fermentation product increase milk yield and did not affect the milk composition of dairy cows. These effects represent a better ruminal environment promoted by YFP to maintaining the rumen pH highest. YFP plus high starch level in lactating cows'diet increase the ruminal bacteria growing, improving the rumen NDF digestion and consequently the milk production.