During last decades the consumer trust in food quality has drastically decreased, mainly because of the growing ecological awareness and several food scandals like Bovine Spongiform Encephalopathy (BSE), dioxins and bacterial contamination. It has been found that intensive conventional agriculture could introduce contaminants into food chain, first of all nitrates and nitrosamines, residues of pesticides, antibiotics and growth hormones. Consumers started to look for safer and better controlled foods, produced in more environmentally friendly, authentic and local system.
Organically produced foods are widely believed to satisfy the above demands, providing better environment and higher nutritive values. Several research studies conducted in many European countries have partly confirmed this opinion.
Organic crops contain fewer nitrates and nitrites and fewer residues of pesticides than conventional ones. They contain as a rule more dry matter, more vitamin C and B-group vitamins, more phenolic compounds, more exogenous indispensable amino acids and more total sugars; however the level of β carotene is often higher in conventional plant products. Organic crops contain statistically more iron, magnesium and phosphorus, and they have usually better sensory quality. Vegetables, potatoes and fruits from organic production show better storage quality during winter keeping. Farm animals from organic herds show less metabolic diseases like ketosis, lipidosis, arthritis, mastitis and milk fever. Small experimental mammals (rats, rabbits) fed organically grown feed show better health and fertility parameters.
However, there are also some negatives: plants cultivated in organic system have as a rule 20 % lower yield than conventionally produced crops. Milk and meat yield is also lower in organic animal production, partly because parasitic afflictions are more frequent.
Several important problems need to be investigated and settled in coming years: environmental contamination of the organic crops (heavy metals, polychlorinated biphenyls (PCBs), dioxins, and aromatic hydrocarbons), bacterial and fungi contamination (Salmonella, Campylobacter, mycotoxins). Last but not least, the impact of the organic food consumption on human health and well being still remains unknown and needs explanation.

Key words: food quality, organic plant products, organic animal products, animal health

CITATED REFERENCES :

1. Aubert C. Pollution du lait maternel, une enquete de Terre vivante. -Les Quatre Saisons du Jardinage 1987;42:33-39.

2. BMA. The BMA guide to pesticides, chemicals and health. Report of science and education. British Medical association, UK. 1992.

3. Brandt K, M_lgaard JP. Organic agriculture: does it enhance or reduce the nutritional value of plant foods? -J. Sci. Food Agric. 2001;81:924–31.

4. Bulling W. Qualitatsvergleich von „biologisch” und „konventionell” erzeugten Feldfruchten. Regierungsprasidium Stuttgart. 1987.

5. Castellini C, Mugnai C, Dal Bosco A. Effect of organic production system on broiler carcass and meat quality. Meat Science 2002;60:219–5.

6. Council Regulation EC 1804 / 99 of 19 July 1999 supplementing Regulation EC no. 2092 / 91 on organic production of agricultural products and indications referring thereto on agricultural products and foodstuffs to include livestock production. 1999.

7. Council Regulation no. 2092 / 91 of 24 June 1991 on organic production of agricultural products and indications referring thereto on agricultural products and foodstuffs. 1991.

8. Department for Environment Food and Rural Affairs. http://www.defra.gov.uk/farm/organic/actionplan/prospects.htm. 2003.

9. Europa: L’ agriculture biologique dans l’UE: faits et chiffres. http://europa.eu.int. 2001.

10. Haas G, Wetterich F, Kopke U. Life cycle assessment of intensive, extensified and organic grassland farms in southern Germany. Proceedings 13th International IFOAM Scientific Conference (ed. T. Alfoldi, W. Lockeretz, U. Niggli), Basel, Switzerland. 2000.

11. Hansen B, Alr_e HF., Kristensen ES, Wier M. Assessment of food safety in organic farming. DARCOF Working Papers no. 52. 2002.

12. Hansson I, Hamilton C, Ekman T, Forslund K. Carcass quality in certified organic production compared with conventional livestock production.- J. Vet. Med. B 2000;47:111 -20.

13. Hardeng F, Edge VL. Mastitis, ketosis and milk fever in 31 organic and 93 conventional Norwegian Dairy Herds. J. Dairy Sci. 2001;84:2673 –79.

14. IFOAM 2001. Basic standards for organic farming and processing, 2nd draft. 2002.

15. Karwowska W. Comparison of dairy cows’ health status in the organic and conventional farms in Poland. In: Comparison of the organic and conventional agricultural farms in Poland (ed. M. Gorny). Wydawnictwo SGGW, Warszawa, 1999:78–7.

16. Kouba M. Quality of organic animal products. -Livestock Production Science 2003;80:33-40.

17. Lund V, Algers B. Research on animal health and welfare in organic farming –a literature review. -Livestock Production Science 2003;80:55–8.

18. Lundeg_rdh B, M_rtensson A. Organically produced plant foods –evidence of health benefits. -Acta Agric. Scand., Sect. B, Soil and Plant Sci. 2003;53:3–5.

19. Mercola J. Organic Farming Has Dramatic Increase In Europe. http://www.mercola.com/2000/jan/2/organic_farming%20_europe.htm. 2004

20. Mirvish SS. Vitamin C inhibition of N-nitroso compounds formation. -Am. J. Clin. Nutr. 1993;57:598 –9.

21. Olsson V, Andersson K, Hansson I, Lundstrom K. Differences in meat quality between organically and conventionally produced pigs. -Meat Science 2003;64:287–97.

22. Pastuschenko V, Matthes H.-D, Hein T, Holzer Z. Impact of cattle grazing on meat fatty acid composition in relation to human nutrition. Proceedings 13th International IFOAM Scientific Conference (ed. T. Alfoldi, W. Lockeretz, U. Niggli), Basel, Switzerland 2000: 293–96.

23. Rembia kowska E. Wholesomeness and sensory quality of potatoes and selected vegetables from the organic farms. Fundacja Rozwoj SGGW, Warszawa. 2000.

24. Szponar L, Kierzkowska E. Azotany i azotyny w Erodowisku oraz ich wp yw na zdrowie czlowieka. -Post. Hig. Med. DoEw. 1990;44:327–0.

25. Williams CM. Nutritional quality of organic food: shades of grey or shades of green? -Proceedings of the Nutrition Society 2002;61:19–4.

26. Worthington V. Nutritional Quality of Organic Versus Conventional Fruits, Vegetables, and Grains. -The Journal of Alternative and Complementary Medicine 2001;7/2:161–3.

27. Zadoks JC. Development of Farming Systems, Pudoc, Wageningen. 1989.