Parâmetros sanguíneos e histopatológicos de ovinos confinados alimentados com silagem de cana-de-açúcar aditivada com farelo de mamona destoxificado

Abstract

The aim of the study was to evaluate blood and histopathological parameters through the evaluation of blood and histology of rumen, liver and kidney of confined sheep, fed with sugarcane silage with different levels of detoxified castor meal. Twenty-four non-castrated sheep with no defined racial pattern were used, with an initial average live weight of 25 kg. A completely randomized design was used, with four treatments and six replications. The treatments were represented by four levels of inclusion of castor bean meal in sugarcane silage, being 0; 10; 20; 40%, based on fresh matter. Blood and histological parameters of the rumen, liver and kidney were evaluated. Data were submitted to analysis of variance and regression using Tukey's test at 5% probability. Morphometric analyzes showed an increasing linear effect for the variables of keratinized portion and epithelium thickness, while for papilla width there was a quadratic effect (p=0.0274). For the blood count, there was an isolated effect for the Time factor on the variables of hemoglobin (p = 0.0043), hematocrit (p = 0.0067) and mean corpuscular. There was no significant effect for the histological parameters, however, there was a decrease in the glycogen stock as the castor bean meal was included in the diets. The inclusion of detoxified castor bean meal in sugarcane silage did not cause deleterious changes in the hematological and histological parameters of the rumen, liver and kidney of sheep. Its use can be recommended at a level of up to 40% of inclusion in sugarcane silage.