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 addition of Zenural 70, urea and Min-A-Zel Plus on chemical composition and quality of whole maize plant silage with different degree of compression was investigated in the paper. Experiment was two-factorial (2x3) with three replications, where factor A was a degree of compression (A₁ = 680 g/dm³; A₂ = 550 g/dm³), while factor B was an additive type (Decontrol; B₂=5 g/kg urea+2 g/kg Min-A-Zel Plus; B₃=5 g/kg Zenural 70).

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.

The influence of mineral adsorbent Min-A-Zel Plus (5 g/kg) and maize meal (25 and 50 g/kg) used alone or combined, on chemical composition, biochemical changes and quality of lucerne silage was investigated. Based on the obtained data, it can be concluded that addition of Min-A-Zel Plus reduces aminogenesis, while the use of maize meal alone or with zeolite favorable conditions are achieved for lactic acid fermentation, so that the quality of obtained silages is better by one quality class.

The influence of acetic acid as the chemical conservant in three doses (4, 6 8 g/kg green mass) on the intensity of fermentation and proteolysis in lucerne silage was investigated. On the basis of chemical analysis, it was found that with the increase of conservant dose the pH value decreased aminogenesis and nitrogen solubility was limited. In silages treated the absolute and relative domination of acetic acid was found in total acid content. The increase of free and bonded acetic acid was discovered with the increase of conservant dose.

Lucerne of the 5^th cut in the budding phase was ensiled in the experiment as fresh and wilted (DM= 220 and 360 g/kg), with two degrees of compression (520 and 380 g/dm³) and with added Min-a-zel plus as 2 g/kg green mass. The experiment was performed as the statistical model 2^K. Min-a-zel plus used as 2 g/kg green mass had no influence on biochemical, microbiological and mycotoxicological parameters of lucerne silage. Compared to the beginning material, silages had more diverse microflora and more mycotoxins.

The influence of different doses of natural zeolite addition on chemical composition and quality of beet pulp silages was investigated. Beet pulp was ensiled in the sugar factory in Požarevac immediately after they were obtained, or after 9 or 17 days.