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Data were collected over the first 4 generations of a divergent selection experiment for residual feed intake of Large White pigs having ad libitum access to feed. This data set was used to obtain estimates of heritability for residual feed intake and genetic correlations ([r.sub.a]) between this trait and growth, carcass, and meat quality traits. Individual feed intake of group-housed animals was measured by single-space electronic feeders. Upward and downward selection lines were maintained contemporarily, with 6 boars and 35 to 40 sows per line and generation. Numbers of records were 793 for residual feed intake (RFI1) of boar candidates for selection issued from first-parity (P1) litters and tested over a fixed BW range (35 to 95 kg) and 657 for residual feed intake (RFI2) and growth, carcass, and meat quality traits of castrated males and females issued from second-parity (P2) litters and tested from 28 to 107 kg of BW. Variance and covariance components were estimated using REML methodology applied to a series of multitrait animal models, which always included the criterion for selection as 1 of the traits. Estimates of heritability for RFI 1 and RFI2 were 0.14 [+ or -] 0.03 and 0.24 [+ or -] 0.03, respectively, whereas the estimate of [r.sub.a] between the 2 traits was 0.91 [+ or -] 0.08. Estimates of [r.sub.a] indicated that selection for low residual feed intake has the potential to improve feed conversion ratio and reduce daily feed intake, with minimal correlated effect for ADG of P2 animals. Estimates of [r.sub.a] between RFI2 and body composition traits of P2 animals were positive for traits related to the amount of fat depots ([r.sub.a] = 0.44 [+ or -] 0.16 for carcass backfat thickness) and negative for carcass lean meat content ([r.sub.a] = -0.55 [+ or -] 0.14). There was a tendency for a negative genetic correlation between RFI2 and carcass dressing percent ([r.sub.a] = -0.36 [+ or -] 0.21). Moreover, selection for low residual feed intake is expected, through lower ultimate pH and lighter color, to decrease pork quality ([r.sub.a] = 0.77 [+ or -] 0.14 between RFI2 and a meat quality index intended to predict the ratio of the weight of ham after curing and cooking to the weight of defatted and boneless fresh ham). Key words: carcass composition, growth, meat quality, pig, residual feed intake

The aim of this work was to estimate whether genetic dissection of QTL on chromosomes 1, 2, 4, and 7, detected in an [F.sub.2] Meishan x Large White population, can be achieved with a recombinant backcross progeny test approach. For this purpose, a first generation of backcross (B[C.sub.1]) was produced by using frozen semen of [F.sub.1] Large White x Meishan boars with Large White females. Four B[C.sub.1] boars were selected because of t8heir heterozygosity for at least 1 of the 4 regions. The B[C.sub.1] boars were crossed with Large White sows, and the resulting B[C.sub.2] offspring were measured for several growth and body composition traits. Contrary to the [F.sub.2] animals, B[C.sub.2] animals were also measured for meat quality traits in adductor, gluteus superficialis (GS), longissimus dorsi, and biceps femoris (BF) muscles. Each B[C.sub.1] boar was tested for a total of 39 traits and for the 4 regions with statistical interval mapping analyses. The QTL effects obtained in B[C.sub.1] families showed some differences compared with those described in [F.sub.1] families. However, we confirmed QTL effects for growth in the SW1301-SW2512 markers interval on chromosome 1 and also for body composition in the SW1828-SW2512 markers interval on chromosome 1, in the SW2443-SWR783 markers interval on chromosome 2, and in the SW1369-SW632 markers interval on chromosome 7. In addition, we detected new QTL for growth traits on chromosome 2 and for meat quality traits on chromosomes 1 and 2. Growth of animals from weaning to the end of the test was influenced by the IGF2 gene region on chromosome 2. Concerning meat quality, ultimate pH of adductor, longissimus dorsi, and BF were affected by the interval delimited by UMNP3000 and SW2512 markers on chromosome 1, and [a.sup.*] of GS, [L.sup.*] of BF, and water-holding capacity of GS were affected by QTL located between marker loci SW2443 and SWR783 on chromosome 2. Recombinant progeny testing appeared to be a suitable strategy for the genetic dissection of the QTL investigated. Key words: backcross, body composition, growth, meat quality, pig, quantitative trait loci