According to the EC Regulation 1804/99, health and welfare of organic livestock should be promoted primarily by preventive measures using appropriate breeds, feeds and feeding practices and husbandry techniques for the species in question and by implementing stable social conditions for breeding animals (CEC, 1999). Whilst the EC Regulation on organic livestock production came into force fairly recently in August 2000 and has hardly had a chance to have an impact on existing organic production systems, there is a growing body of epidemiological evidence on the impact of organic management on the health and welfare of livestock. Furthermore, a three-year networking project, the Network for Animal Health and Welfare in Organic Agriculture (NAHWOA), between 17 institutes from 13 different EU countries has recently published their conclusions and recommendations on animal health and welfare in organic production systems (Anon, 2002). A recent review of literature (Hovi et al., in press) and the NAHWOA conclusions suggest that animal health situation in organic livestock systems is similar to that found in conventional systems. Some differences in the prevalence of different conditions exist. A typical example of higher dry period but lower lactation period levels of mastitis in organic than in conventional systems is presented in Figure 1. It has been suggested that the minimal organic standards and their implementation via certification procedure are likely to provide several preconditions for good living conditions for farm animals (Sundrum, 2001), and the NAHWOA concludes that the current evidence supports the claim that organic livestock production often provides better welfare than conventional production systems, particularly by providing more freedom for species-specific behaviour for livestock. It has, however, been suggested that the organic standards do not necessarily provide a balanced approach to animal welfare and that some conflicts between welfare aims and other organic farming objectives may exist (Anon, 2002). An example of how experts perceive the impact of organic standards on animal welfare is given in Figure 2.