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Table 4 Effects of dietary protein/energy ratio and breed on carcass performance in pigs

From: Effects of dietary protein/energy ratio on growth performance, carcass trait, meat quality, and plasma metabolites in pigs of different genotypes

Item Landrace pig Bama mini-pig SEM P-value
GB diets NRC diets GB diets NRC diets Breed Diet B × D
Nursery phase         
   Pre-slaughter BW, kg 19.39a 19.15a 12.00b 14.40b 0.84 <0.001 0.21 0.13
   Left carcass BW, kg 6.25a 6.17a 3.20c 4.19b 0.32 <0.001 0.16 0.10
   Dressing percentage, % 64.29a 64.15a 53.26c 58.16b 1.32 <0.001 0.08 0.06
   Carcass length (bevel), cm 25.69a 23.76a 14.92b 15.69b 1.13 <0.001 0.61 0.24
   Carcass length (straight), cm 24.04a 21.72a 13.56b 14.35b 1.03 <0.001 0.46 0.14
   Backfat thickness, mm 7.78a 5.64b 6.81ab 7.19ab 0.52 0.75 0.78 0.14
   Loin-eye area, mm2 904.40b 1,124.20a 372.30c 437.80c 73.41 <0.001 0.06 0.30
   Total skeletal muscle, % 61.23a 65.75a 47.70b 46.38b 1.58 <0.001 0.32 0.07
   Total fat, % 6.47b 3.63b 19.36a 23.54a 1.56 <0.001 0.67 0.03
Growing phase         
   Pre-slaughter BW, kg 58.51a 49.21b 33.62c 34.36c 1.87 <0.001 0.05 0.02
   Left carcass BW, kg 20.98a 17.66b 10.91c 11.23c 0.71 <0.001 0.07 0.03
   Dressing percentage, % 71.67a 71.74a 65.04b 65.13b 0.97 <0.001 0.94 0.99
   Carcass length (bevel), cm 85.21a 80.57b 69.33c 69.29c 1.18 <0.001 0.08 0.08
   Carcass length (straight), cm 82.07a 76.57b 59.00c 61.29c 1.12 <0.001 0.20 0.004
   Backfat thickness, mm 6.07b 6.54b 30.70a 33.36a 1.33 <0.001 0.29 0.46
   Loin-eye area, mm2 1,919.70a 1,724.20a 696.70b 671.70b 120.20 <0.001 0.41 0.52
   Total skeletal muscle, % 66.53a 62.97b 40.70c 40.08c 1.08 <0.001 0.09 0.22
   Total fat, % 10.07c 13.45b 34.60a 35.88a 0.87 <0.001 0.02 0.28
Finishing phase         
   Pre-slaughter BW, kg 86.79a 92.03a 49.84b 49.19b 2.15 <0.001 0.36 0.24
   Left carcass BW, kg 32.39a 34.79a 17.14b 17.69b 0.90 <0.001 0.16 0.38
   Dressing percentage, % 74.50a 75.61a 68.91c 71.90b 0.76 <0.001 0.03 0.29
   Carcass length (bevel), cm 92.29a 92.00a 81.80b 78.86b 1.32 <0.001 0.30 0.39
   Carcass length (straight), cm 87.40a 87.83a 79.90b 77.00b 1.22 <0.001 0.39 0.25
   Backfat thickness, mm 22.69b 23.52b 40.40a 43.29a 1.42 <0.001 0.27 0.53
   Loin-eye area, mm2 3,303.90a 2,836.60a 1,018.50b 812.40b 155.78 <0.001 0.07 0.47
   Total skeletal muscle, % 61.84a 62.73a 37.40b 38.38b 0.97 <0.001 0.41 0.98
   Total fat, % 15.65b 16.81b 38.00a 37.85a 1.01 <0.001 0.67 0.57
  1. a, b, c Mean values with unlike superscript letters were significantly different (P < 0.05). n = 8
  2. GB diets, Chinese conventional diets; B × D, breed × diet interaction