Quantificação de microrganismos ruminais de novilhos alimentados com cana-de-açúcar ou feno de tifton com diferentes relações volumoso:concentrado

• Autor(a) principal: Ribeiro Júnior, Carlos Stefenson [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/110729
• topic: Bovino - Alimentação e rações; Carboidratos; Rúmen - Fermentação; Rumen - Microbiologia; Reação em cadeia de polimerase; Proteínas; Rumen fermentation

This trial aimed to characterize the changes in ruminal microbiota, ruminal fermentation, intake, diet digestibility and microbial efficiency in Nellore steers fed with different forage:concentrate proportions, using as sources of forage Tifton 85 hay or sugar cane. Two experiments were conducted: in experiment 1 the sugar cane was used as forage source and in Experiment 2 the Tifton 85 hay was used as forage source. In both experiments were tested different F:C proportions (70:30, 60:40, 40:60 and 20:80). On each experiment were usedeight Nellore steers ( 331 ± 8 kg BW) cannulated in the rumen, in a double latin square 4x4 balanced to control the residual effect. In experiment 1 (sugar cane), increasing the proportion of concentrate in the diet reduced the population of Fibrobacter succinogenes and Ruminococus flavefaciens, and increased the population of Selenomonas ruminantium and Megasphaera elsdenii, but the digestibility of NDF has not changed. The increased participation of non-structural carbohydrates in the diet favored microbial protein synthesis and reduced the population of fibrolytic bacteria. The use of sugar cane as forage source associated with the increases of concentrate proportions in the diet can optimize microbial protein synthesis without change the fiber digestibility. In experiment 2 (Tifton 85 hay), increasing the proportion of concentrate in the diet reduced the population of Fibrobacter succinogenes, Ruminococcus albus and Ruminococus flavefaciens and increased the population of Selenomonas ruminantium, Megasphaera elsdenii and Streptococcus bovis and the digestibility of NDF decreased when increases the proportion of concentrate in the diet. Tifton 85 hay in diets with high proportions of concentrate can minimize the risk of ruminal disorders in feedlot steers