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Table 1 Effect of surgical castration on growth rate in the suckling period by initial body weight groupa

From: Surgical castration with pain relief affects the health and productive performance of pigs in the suckling period

Item Intact Males Castrated Males SEM b P value 3
Light pigs
 Initial number of pigs 476 459   
 Body weight, day 0 (kg) 1.43 1.42 0.008 0.528
 Body weight, day 28 (kg) 5.69 5.77 0.062 0.367
 Average daily gain (g/day) 182.3 185.5 2.648 0.379
Medium pigs
 Initial number of pigs 921 931   
 Body weight, day 0 (kg) 1.96 1.97 0.006 0.226
 Body weight, day 28 (kg) 6.83 6.79 0.041 0.540
 Average daily gain (g/day) 210.0 208.5 1.768 0.535
Heavy pigs
 Initial number of pigs 451 458   
 Body weight, day 0 (kg) 2.55 2.57 0.012 0.388
 Body weight, day 28 (kg) 7.97 7.81 0.063 0.050
 Average daily gain (g/day) 237.4 230.4 2.615 0.059
  1. aPigs were split in three groups according to their initial body weight: light pigs (25% pigs with the lightest initial body weight), medium pigs (50% pigs with medium initial body weight) and heavy pigs (25% pigs with the heaviest initial body weight)
  2. bStandard Error of Mean
  3. 3 P-value for surgical castration treatment effect (Intact vs. Castrated male pigs) obtained by multiple comparisons using Tukey’s correction