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Comparative Performance of Landrace, Duroc, and Yorkshire Breeds of Swine
Dissertation Abstract:
The reproductive performance data of 3,266 Yorkshire, 1,495 Landrace, and 1,451 Duroc sows which farrowed in Decemeber 1979-November 1983 as well as the productive performance data of 1,882 Yorkshire, 1,100 Landrace, and 881 Duroc boars and 3,178 Yorkshire, 1,806 Landrace, and 1,131 Duroc gilts, which completed their performance test in the same period, were used in the study.
The traits associated with sow productivity obtained from the Yorkshire, Landrace, and Duroc breeds were: number of pigs born alive, 9.25, 9.22, and 7.78; number of pigs born dead, 0.86, 0.68, and 0.69; average litter size at birth, 10, 11, 9.91, and 8.46; litter size at weaning, 7.68, 7.87, and 5.05; weaning age, 36.12, 37.44, and 37.41 days; percent stillborn pigs, 6.77, 5.30, and 6.81; weaning percentage based on total pigs born, 75.35, 80.13, and 60.50; weaning percentage based on pigs born alive, 80.71, 84.77, and 64.71; pig birth weight, 1.34, 1.49, and 1.52 kg; litter birth weight, 11.87, 13.15, and 11.37 kg; pig weaning weight, 5.98, 6.53, and 6.10 kg; litter weaning weight, 47.11, 51.67, and 34.69 kg; gestation period, 114.31, 114.73, and 114.29 days; age at first farrowing, 407.07, 410.42, and 401.72 days; interval between weaning to conception, 25.23, 31.22, and 23.92 days; and interval between two farrowings, 172.07, 181.21, and 169.11 days, respectively.
The effects of breed on most of the reproductive traits were highly significant. Significant year effects on the reproductive traits were also observed in many traits. Season effects were highly significant in most reproductive traits.
The average of the different production traits of boars belonging to the Yorkshire, Landrace, and Duroc breeds were: age at 90 kg, 166.96, 174.30, and 172.18 days; average daily gain, 784, 727, and 763 g; feed efficiency, 2.41, 2.48, and 2.49; backfat thickness, 2.54, 2.36, and 2.45 cm; selection index, 156, 149, and 151,; and average daily feed consumption, 1.87, 1.79, and 1.88 kg, respectively.
The averages of the different production traits of gilts belonging to the Yorkshire, Landrace, and Duroc breeds were: age at 90 kg, 181.80, 188.92, and 185.45 days; average daily gain, 670, 626, and 671 g; feed efficiency, 2.67, 2.68, and 2.72; backfat thickness, 2.51, 2.39, and 2.40 cm; selection index, 131, 128, and 131; and average daily feed consumption, 1.71, 1.61, and 1.78 kg, respectively.