The objective of this work was to map QTL on porcine chromosome 4 and associate them to performance traits. For this, a F2 pig population was established from a cross from the F1 generation, produced by crossing two naturalized Brazilian Piau sires and 18 commercial dams (Landrace × Large White × Piétrain). The population was genotyped for five microsatellite markers. The performance of traits evaluated in the population were: teat number, birth weight, weight at 21, 42, 63, 77 and 105 days of age, slaughter age, feed intake, feed gain ratio, average daily gain from 77 to 105 days of age, and slaughter age. Data were analyzed through multiple regressions developed for analysis of interval mapping using QTL EXPRESS software. Significant evidence for QTL was verified for weight at 77 days of age. The use of this information for marker assisted selection can be done after fine mapping, identification of the causative mutation and estimation of its effects.
animal breeding; divergent cross; microsatellite markers
