Uso de líquido da castanha de caju e quitosana em suplemento para bovinos a pasto

Abstract

The research proposed to evaluate the addition of Cashew Nut Liquid (LCC) and Chitosan as natural additives for pasture supplemented cattle. Five (5) rumen cannulated crossbred steers with an average weight of 300 kg were randomly distributed in a 5x5 Latin square design and kept in individual paddocks of Urochloa brizantha, supplemented with 0.4% of body weight with a supplement containing crude protein. The experimental diets provided were: 1) Mineral supplementation (Control); 2) protein supplementation; 3) Protein supplementation with addition of chitosan in the dosage of 900mg / kg DM; 4) Protein supplementation with the addition of LCC, at a dosage of 600mg / kg DM; and 5) Protein supplementation with the addition of chitosan plus LCC (900mg + 600mg / kg DM). The animals supplemented with CCT presented lower consumption of pasture, DM and CP compared to animals that received only supplementation. The steers supplemented with CCT * QUIT presented higher supplement intake (P = 0.004) and higher CP intake (1.015 kg / day). Inclusion of chitosan in the diet led to a reduction (P<0.05) in the acetate molar concentration and a higher propionate production (P<0.03). The animals that received CCT in their diet had higher values on nitrogen synthesis and microbial protein (P = 0.004). The association of additives at dosages of 900mg + 600mg / kg promoted higher nitrogen consumption (P = 0.126) and nitrogen balance (P = 0.201). The cashew nut liquid was efficient on the digestibility and synthesis of microbial protein of the animals. The association of additives promoted higher supplement intake and nitrogen balance. Inclusion of chitosan in the diet led to a reduction in molar acetate concentration and a higher production of propionate.