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In the last century an enormous increase in poultry performance both for egg and meat production occurred. Average egg production increased from 176 eggs/hen/year in 1925 to 309 eggs/hen/year in 1998; on the other side, the days to produce 1500 grams of live gain decreased from 120 days in 1925 to 33 days in 1998 [1]. Nowadays, in European Union, the 95% of poultry production comes from intensive breeding systems, while the remaining 5% from organic (OP) and freerange production systems. The more common poultry genotypes sold to farmers can be divided into different groups according to their productive performance:

Chicken Adaptability in Alternative Systems Adaptive Response of Chicken Strains to the Organic and Free Range Rearing Systems