RESEARCH ON CHEMICAL COMPOSITION OF MIXED FEED USED FOR THE FEEDING LAYING HENS IN DIFFERENT SYSTEMS PRODUCTION (CONVENTIONAL AND ORGANIC)

Maria Bologa, I.M. Pop, Aida Albu

Abstract
The aim of this study was the comparative analysis of the chemical composition determined for 10 samples of mixed feed collected from two units from Romania with different systems in hens egg production (conventional and organic). Premixtures contain similar ingredients, except for the chemical synthesis of animal origin which are not allowed in organic production. The research focused on determining the gross chemical composition (content of dry matter, crude ash, crude protein, crude fat, crude fiber and SEN) using classical methods in order to standards and legislation. Statistical analysis, revealed signiflcant differences between the mean values calculated for mixed feed samples derived from conventional system compared with the ecological one for dry matter (0.57±0.09%DM vs. 91.13±0.04%DM), crude ash (11.02±0.05%Ash vs. 12.48±0.14 %Ash), crude protein (19.28±0.08%PC vs. 14.39±0.10%PC), crude fat (3.12±0.05%FC vs. 5.03±0.04%FC) and (61.19±0.11%SEN vs. 62.59±0.12%SEN). For crude fiber the differences were insignificant.

Key words: chemical composition, mixed feed, farming system, organic, conventional