Distiller’s dried grains with solubles ( Zea mays L.) in feeding sheep on nitrogen balance

The objective of this study was to evaluate the effects of diets supplemented with 0.0, 8.0, 16.0, and 24.0% distiller's dried grain solubles (DDGS) on nitrogen (N) intake, fecal and urinary N excretion, and N absorption and retention (N balance, NB) by feeding sheep. Four sheep of unidentified race were used, with an average body weight of 23.5 +/- 1.5 kg, and housed in metabolism cages. We used a 4 x 4 Latin square design for the experimental design, and each experimental period lasted for 20 days. Data on N intake (NI), fecal N, urinary N, absorbed N, and NB were expressed in g day(-1); percentage of NI and grams per kilogram of metabolic weight g (kg(0.75))(-1) were subjected to analysis of variance (ANOVA) and regression analysis at 5% probability. Inclusion of the different concentrations of DDGS in sheep diets had no effect on NI (mean of 15.11 g animal(-1) day(-1)), nor on fecal and urinary N excretion (mean of 5.16 and 0.16 g animal(-1) day(-1), respectively). Moreover, DDGS supplementation did not alter NB or N absorption (mean of 9.79 and 9.95 g animal(-1) day(-1), respectively). Thus, it can be concluded that inclusion of up to 24% of DDGS in feed does not affect NI, fecal and urinary N excretion, and NB in sheep.