Desempenho de ovinos confinados alimentados com silagem de cana de-açúcar aditivada com farela de mamona destoxificado

Abstract

This work aimed to evaluate the performance of confined lambs fed with sugar cane silage added with levels of detoxified castor bean meal. The experiment was carried out between July and September 2021 at the experimental station of the National Semi-Arid Institute (INSA/MCTI), Campina Grande – PB. 24 uncastrated male sheep, of undefined breed standard, with an initial average weight of 25kg were used. The animals were distributed in a Completely Randomized Design (DIC) consisting of four treatments and six replications. Four levels of addition of detoxified castor bean meal to sugarcane silage were used, with levels of 0%, 10%, 20% and 40%. The animals were confined for a period of 60 days, of which the first 10 days were dedicated to adapting the diet and the remaining 50 days to the experimental period. The consumption of organic matter (CMO), dry matter (CMS), crude protein (CPB), ether extract (CEE), neutral detergent fiber (CFDN), carbohydrates (CCHO) and non-fibrous carbohydrates (CCNF) were evaluated. Animal performance was evaluated through average daily gain (ADG), feed conversion (CA) and feed efficiency (EA). A significant effect was observed with a decreasing linear response (P<0.05) on the variables of consumption of organic matter (P=0.003), crude protein (P=0.000), ether extract (P=0.000) and neutral detergent fiber. (P=0.001). There was no significant effect for the variables of average daily gain (ADG), feed conversion (CA) and feed efficiency (EA). The addition of detoxified castor bean meal to sugarcane silage showed a linear reduction in the consumption variables for organic matter, crude protein, ether extract and neutral detergent fiber, however without affecting the performance of sheep in confinement.