Coproduto de fecularia de mandioca e ureia protegida na alimentação de vacas em lactação

Abstract

This study aimed to evaluate the efficiency of the of dehydration process of co-product of sun cassava starch manufacturer (CFM) and the effect of storage period on their nutritional and microbiological quality. CFM dehydration curve of sun and nutritional quality was performed for 0, 30, 60, 90, 120 and 180 days of storage and the microbiological quality, in addition to the aforementioned times was also evaluated the 15th day of storage. The nutritional quality and the population of CFM yeasts and enterobacteria were not affected by the 180 days but a quadratic effect (P <0.05) for the bacteria Clostridium genus was verified. The main fungi found were Aspergillus, Fusarium and Penicillium. In this context, the dehydration of CFM to the sun is an effective practice in the conservation of this material, allowing a high storage time. Another objective was to evaluate the levels of protected urea Optigen® II associated with the co-product of cassava starch manufacturer (CFM) for the feeding of dairy cows, for this a study was done using five lactating cows fed diets containing levels (0%, 0.4%, 0.8%, 1.2% and 1.6%) of protected urea Optigen® II in the concentrate. Cows were distributed in a 5x5 Latin square, evaluating the intake and digestibility of nutrients, milk production and composition, metabolic parameters, microbial synthesis and economic viability of diets. There was no significant effect (P>0.05) on the intake and digestibility of dry matter and other nutrients. Urea levels did not influence the production and composition of milk. For metabolic parameters, the glucose in serum had no effect between treatments, and no interaction between time and treatment, serum urea nitrogen did not differ between treatments, but there was the time effect and interaction between time and treatment. The synthesis of microbial protein showed a quadratic effect (P<0.05), maximum point estimated to be 158.19 g.kg-1 TDN assigned to the level of 0.78% protected urea. In this context, the level of 1.6% protected urea associated with the CFM did not affect dry matter intake, digestibility of dry matter and other nutrients, as well as the production and composition of milk ensuring economic return to the productive sector