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The experiment was conducted to evaluate the effect of added ﬁber into diets on absorption and distribution of nitrogen at different levels of dietary nitrogen. Four diets were designed with a combination of two concentrations of fiber: high (4.46 %; HF) and low (3.25 %; LF) level of fiber, and two levels of dietary nitrogen: high (18.8 %; HP) and low (14.0 %; LP) dietary nitrogen. Significant effects of fiber intake on increased dry matter intake were found only in one case. The nitrogen intake was not affected by the fiber content. Changes in the proportion of excreted nitrogen in urine and faeces were proven. Changing the nitrogen content of the feed has a more significant effect (P < 0.03) than changing the fiber content (P < 0.05). Very high coefficient of determination between nitrogen absorption and nitrogen intake calculated for the diets with low fiber content was R2 = 0.91 and for diets with high fiber R2 = 0.97. By comparing the differences in nitrogen digestibility expressed in g.d-1 nitrogen, significant deviation was found only in the HFHP group (+ 6.37 g.d-1 = + 19.9 %; P = 0.03) among the groups with different fiber content. In retention, we found a positive change comparing the groups LFHP vs. HFHP, + 6.22 g.d-1 = + 25 % (P = 0.05). It is the same pair of diets in which we found also a significant difference in dry matter intake (+ 15 %). Absorption and retention of nitrogen, expressed as a percentage of N intakes, did not decrease in any of the experimental groups irrespective of nitrogen and fiber content in the diet. These data suggest that fiber added into a diet with higher content of CP increased nitrogen in faeces, reduced nitrogen in urine, positively affected the overall balance of N and had only weak effect on its absorption.
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