The aim of this work was to study fear responses and their relation toproduction traits in red junglefowl ( Gallus gallus spp.), White Leghorn (Gallus domesticus ), and their F2-progeny. Quantitative trait locus (QTL)analyses were performed for behavioral traits to gain information about possiblegenetic links between fear-related behaviors and production. Four behavioraltests were performed that induce different levels of acute fear (open field[OF], exposure to a novel object, tonic immobility, and restraint). Productiontraits, that is, egg production, sexual maturity (in females), food intake, andgrowth, were measured individually. A genome scan using 105 microsatellitemarkers was carried out to identify QTLs controlling the traits studied. In theOF and novel object tests (NO), Leghorns showed less fear behavior thanjunglefowl, whereas junglefowl behaved less fearfully in the tonic immobilitytest (TI) and were more active in the restraint test. In the F2 progeny, onlyweak phenotypic associations were found between production traits and fearbehavior. A significant QTL for TI duration was found on chromosome 1 thatcoincided with a QTL for egg weight and growth in the same animals. Another QTLfor NO in males coincided with another major growth QTL. These two known growthQTLs affected a wide range of reactions in different tests. Several othersignificant and suggestive QTLs for behavioral traits related to fear werefound. These QTLs did not coincide with QTLs for production traits, indicatingthat these fear variables may not be genetically linked to the production traitswe measured here. The results show that loci affecting important productiontraits are located in the same chromosomal region as loci affecting differentfear-related behaviors.