Feno de maniçoba em dietas para ovinos: consumo de nutrientes, digestibilidade aparente e balanço nitrogenado Maniçoba hay in diets for sheep: intake, apparent digestibility and nitrogen balance

Objetivou-se determinar o consumo voluntário, a digestibilidade da MS, MO e dos nutrientes (PB, EB, FDN, FDA, CT, CNF e EE) e o balanço de nitrogênio de dietas contendo feno de maniçoba (Manihot glaziovii Muell. Arg.). Vinte quatro cordeiros Santa Inês com média de 28,62 kg PV foram distribuídos em um delinemento completamente casualizado e alimentados com rações contendo 20, 40, 60 ou 80% de feno de maniçoba. Os consumos médios de MS, MO, PB e CT foram 1,24; 1,12; 0,20 e 0,82 kg/dia, respectivamente, e os consumos médios de EM, FDN, FDA, EE e CNF foram, respectivamente, 2,78 mcal/dia; 401,01; 215,50; 83,42; 426,62; e 126,10 g/dia. Os coeficientes de digestibilidade de MS, PB e EB foram, respectivamente, 60,22; 56,16 e 61,90%, e os de FDN, FDA, CT e CNF, 44,73; 54,63; 61,50 e 78,41%, respectivamente. O balanço nitrogenado foi positivo, com média de 7,20 g N/kg MS/dia, e o nitrogênio aparentemente retido representou 21,45% do N ingerido. A inclusão de 80% de feno de maniçoba na dieta não afetou o consumo de MS, no entanto, reduziu a digestibilidade aparente dos nutrientes da dieta.<br>The objective was to determine the voluntary intake and digestibility of DM, OM and nutrients (CP, GE, NDF, ADF, CT, NSC and EE). And nitrogen balance of diets containing maniçoba maniçoba (Manihot glaziovii Muell. Arg.) hay Twenty-four Santa Ines lambs, average 28.62 kg LW were allotted to a completely randomized design and fed diets containing 20, 40, 60 e 80% of maniçoba hay.The mean intakes of DM, OM, CP and CT were 1.24, 1.12; 0.20; and 0.827 kg/d, respectively, and the mean intakes of ME, NDF, ADF, EE and NSC were, respectively, 2.78 mcal/kg, 401.01, 215.50, 83.42, 426.62, and 126.10 g/d. The apparent digestibility for DM, CP, and CE were respectively, 60.22, 61.28, 56.16, 61.90, and for NDF, ADF CT and NSC were, respectively, 44.73, 54.63, 61.50, and 78.41. The nitrogen balance was positive, with mean of 7.20 g N/kg DM/d, and the apparently retained nitrogen represented 21.45% of ingested N. The inclusion of 80% of maniçoba hay in the diet did not affect the DM intake, however, the nutrient apparent digestibility in the diet decreased as maniçoba hay increased in the diet.