The objective of the study was to compare the carcass characteristics, meat quality, and blood parameters of slow and
fast grown female broiler chickens fed in organic or conventional production system. The two genotypes tested were medium slowgrowing
chickens (SG, Hubbard Red JA) and commercial fast-growing chickens (FG, Ross 308). Both genotypes (each represented by
400 chickens) were divided into two sub-groups fed either organic (O) or conventional (C) systems. Chickens of each genotype and
system were raised in a semi environmentally controlled poultry house until 21 d of age and were assigned to 5 pens of 40 chickens
each. Then, O system chickens were transferred into an open-side poultry house with an outdoor run. At 81 d of age, 10 female chickens
from each genotype and from each production system (n = 40) were randomly chosen to provide material for analysis, and were weighed
and brought to the slaughterhouse to assess carcass characteristics and meat quality. The blood parameters were determined by using 5
female chickens from each genotype and from each production system (n = 20). FG had the higher live weight, along with carcass,
breast, and thigh-drumstick weights compared to SG (p