Quantificação de protozoários ciliados no rúmen de bovinos alimentados com sorgo de alto tanino

Abstract

Sorghum grain is an optimal alternative to replace maize, by its nutritional features and production capacity, showing a better yield of nutrients by area unit. Then the presence of phenolic compounds can modify the ruminal environment. So the aim of this study was to evaluate the total number of ciliated protozoon on rumen of feed bovine with sorghum of high tannin .It has been used four castrated bovines with ruminal fistula. The used experimental sketching was square latin (4x4), with four treatments (T1, T2, T3, T4) and four periods (0, 2, 4, 6h) cropping. The crops of ruminal liquid were carried out in pre- determined and during the crop was evaluated the temperature and pH of ruminal liquid and afterwards the scoring of ciliated protozoon, according to the proposed methodology by Ogimoto and Imai (1981). Data were subjected to variance analysis and regression with level at 5% of significance by SAS statistical program (2010). To the number of total ruminal protozoon (x104), it has been observed a linear behavior decrease (P<0,05) in function to the levels of sorghum with high tannin, it can be explained by the tannin feature forming complex with the substrate interfering on fixing of microorganisms to the cell walls of the plants, causing substrate blocking, interfering on its development, therefore pH variables and temperature did not show differences (P>0,05) in the average values according to sorghum values, these values stand in the optimal levels to protozoon development.