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Table 1 Average (standard deviation) performance test statistics for the purebred and crossbred populations

From: Selection for social genetic effects in purebreds increases growth in crossbreds

Performance records Yorkshire*Landrace Landrace Yorkshire
Group size (number) 17.4 (1.1) 10.8 (2.2) 11.9 (1.9)
Age at start of test (days) 82.1 (5.3) 80.6 (7.9) 84.8 (8.9)
Age at end of test (days) 130.2 (6.1) 140.2 (16.0) 144.3 (17.2)
Duration of test period (days) 48.2 (2.7) 64.4 (8.6) 65.1 (9.1)
Weight at start of test (kg) 34.0 (6.2) 30.1 (1.9) 29.9 (1.8)
Within-group standard deviation in starting weight 5.2 (1.3) 1.6 (0.4) 1.4 (0.5)
Average daily gain (g/day) 1012 (148) 1018 (128) 1009 (124)