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In order for food to be used as soon as possible and as well as possible, it is very important that the silage that feeds the animals is prepared in such a way that it contains as much degradable protein as possible in relation to non-degradable proteins. The paper analyzes the influence of the addition of non protein nitrogen (NPN) to the silage of the whole maize plant on the content of individual protein fractions. Of the NPN compounds, urea (at a concentration of 0.5% and 1%) and Benural S (at a concentration of 1% and 2%) were used. The amount of insoluble proteins and non-protein nitrogen in the silage increased with the addition of NPN compounds. It was quite the opposite with real proteins, the content of which was reduced by their addition. Unavailable proteins (NDICP) and cell wall-bound nitrogen (ADICP) were also most prevalent in silage without additives, and their amount decreased with the addition of NPN compounds. The highest amount of soluble proteins (SolCP) was found in silage with 1% urea (746.73 gkg-1CP), and the lowest in control silage (490.2 gkg-1CP). The addition of NPN compounds to maize silage resulted in a significant increase in the PA fraction of degradable proteins as well as a decrease in PB (all three subfractions) and PC fraction. The addition of non-protein nitrogen (Benural S, urea) to the corn silage of the whole plant affected the content and fractions of carbohydrates in the silage. The amount of total and non-structural carbohydrates decreased, and the amount of lignin increased with the addition of non-protein nitrogen. The addition of urea (0.5% and 1%) had the greatest effect on the amount of NDF and ADF. Differences were statistically significant (p> 0.05)

Influence of addition of non-protein nitrogen to maize silage on digestibility and content of protein and sugar fractions in silage