Animal use approval was not needed for this study because the data were from an existent database and were provided by The Maschhoffs, LLC (Carlyle, IL, United States), and Acuity Ag Solutions, LLC (Carlyle, IL, United States). Loin depth (cLD), backfat (cBF), and hot carcass weight were measured on terminal three-way crossbred pigs. Birth weight and date as well as harvest date were recorded, and harvest age was calculated. Carcass average daily gain (cADG) was calculated for each individual by subtracting birth weight from hot carcass weight and dividing by harvest age.

All individuals were crossbred gilts and barrows, progeny of Duroc sires, and different purebred or crossbred dam lines. Animals were born in three sow farms and raised between September 2015 and November 2019 on two commercial grower–finisher flows (Bergamaschi et al., 2019). The initial data set was composed by 135,768 records, which were edited by removing outliers (exceeding three SD from the mean) for each trait. Table 1 shows the descriptive statistics for the traits of interest; a total of 126,052 records were available for statistical analyses.

Descriptive statistics for the traits used in the study (n = 126,052).

Piglets were moved to different nursing/finishing facilities at weaning (18.7 ± 4.11 days). Individuals were considered ready for harvest at a target weight of approximately 136 kg. Harvest occurred on average at 178 days ± 10.6 days of age.

During the grow–finish period, a standard pelleted gender-specific dietary program was used. Individuals were monitored daily and received standard vaccination and emergency medication. For details on diet composition, vaccination, and medication during nursery, growth, and finish periods, see Lu et al. (2018).

For the data analyses, all animals were allocated into 57 contemporary groups (CG) based on the combination of farm month–year of birth. Frequency in each cell ranged from 153 to 6,025 individuals. Individuals were also allocated into 84 slaughter batches (batch) based on the concatenation of finisher farm and harvest date. Carcass quality traits were measured 24 h postmortem using a Fat-O-Meter system (Frontmatec A/S, Kolding, Denmark) at approximately the 10th rib. The pedigree file animals traced back nine generations, including a total of 2,248 animals.

Phenotyped individuals were progeny of 407 sires, and 279 of them were genotyped using the Illumina porcineSNP60 BeadChip (Illumina, Inc., San Diego, CA, United States). Crossbred individuals were born in a total of 20,525 litters; each sire was parent to 1–546 litters.

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