Genome-wide association studies for the number of animals born alive and dead in duroc pigs. Traditionally, pig breeding programs have focused on improving litter size ( Chen et al., 2019 Chen, Z. Litter size at birth and weaning are among the reproductive traits of greatest economic impact on pig production profitability. The genetic trends show that NT does not follow the increase in NBA, emphasizing the need to review the breeding goals.Ĭoefficient of variation genetic parameters genetic trends piglet variation Within-litter weight coefficient of variation (CV) may be the most appropriate variation measure for application in breeding programs, especially at birth, due to its greater heritability estimate and high and negative genetic correlation with MBW. The genetic trends were linear for NBA and CVB and quadratic for MBW and SDB, whereas for all traits at three weeks, they were close to zero. Genetic correlations between MBW and MT, SDB and SDT, CVB and CVT, and NBA and NT were 0.73☐.16, 0.69☐.54, 0.36☐.80, and 0.95☐.06, respectively. The genetic correlations between NBA and MBW and between MBW and CVB (−0.73☐.20 and −0.93☐.21, respectively) were of moderate to high magnitudes, as well as the genetic correlations between CVT and SDT (0.85☐.39). The following litter traits were evaluated: number of piglets born alive (NBA), within-litter weight mean at birth (MBW), within-litter weight standard deviation at birth (SDB), within-litter weight coefficient of variation at birth (CVB), number of piglets at three weeks (NT), within-litter weight mean at three weeks (MT), within-litter weight standard deviation at three weeks (SDT), and within-litter weight coefficient of variation at three weeks (CVT). We aimed to estimate litter size and litter uniformity genetic parameters and genetic trends of Landrace pigs at birth and at three weeks by using multitrait analyses for 2,787 litters.
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