In the experiment the chemical composition of rumen contents in roe deer (Capreolus capreolus) was investigated in the "Sarajevska Reka" hunting area. The investigations were done on 20 deer shot from May 2005 to January 2006. Experiment was done as random plan, with four treatments (seasons) and uneven distribution of subjects within treatments. The results of chemical analysis confirmed significant influence of season on the amount of total nitrogen and crude protein, ether extract, crude fibre, ash and ammonia nitrogen (P<0.05).

The influence of formic acid added in three doses (3,5 and 7 g/kg fresh mass) in the intensity of proteolysis and fermentation in lucerne silages was investigated. On the basis of chemical analyses, it is observed that with the increase of conserving dose the lower pH value, limited proteolysis and increased preservation of proteins was achieved. The amino acid content varied very much due to their degradation and biosynthesis.