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Table 3 Effects of early antibiotic intervention on growth performance of pigs with different protein level diets1

From: Long-term effects of early antibiotic intervention on blood parameters, apparent nutrient digestibility, and fecal microbial fermentation profile in pigs with different dietary protein levels

Item Low-CP Normal- CP SEM P-value2
Con Ant Con Ant Ant CP Ant × CP
42 d BW, kg 12.23 12.20 12.28 12.25 0.07 0.851 0.743 0.981
ADG, kg/d
 d 42 to 77 0.50 0.52 0.51 0.51 0.02 0.686 0.972 0.786
 d 77 to 185 0.78b 0.81ab 0.84a 0.83a 0.01 0.361 0.002 0.048
 d 42 to 185 0.71b 0.74a 0.76a 0.75a 0.01 0.180 0.001 0.019
ADFI, kg/d
 d 42 to 77 0.72 0.72 0.78 0.78 0.02 0.945 0.140 0.993
 d 77 to 185 2.24 2.36 2.44 2.54 0.06 0.349 0.119 0.891
 d 42 to 185 1.85 1.94 2.02 2.09 0.05 0.368 0.089 0.895
G:F
 d 42 to 77 0.70 0.73 0.67 0.66 0.02 0.880 0.227 0.675
 d 77 to 185 0.36 0.35 0.36 0.33 0.01 0.323 0.787 0.655
 d 42 to 185 0.44 0.44 0.44 0.42 0.01 0.555 0.414 0.605
  1. a, bMeans in the same row with different superscripts differ (P < 0.05)
  2. 1The commercial creep feed with or without in-feed antibiotics (50 mg/kg olaquindox, 50 mg/kg oxytetracycline calcium, and 50 mg/kg kitasamycin) was fed to pig from d 7 to d 42. Thereafter, the Con and Ant group were further randomly assigned to provide a normal (20%, 18%, 14% CP from d 42 to d 77, d 77 to d 120, d 120 to d 185, respectively) or low CP diet (16%, 14%, 10% CP from d 42 to d 77, d 77 to d 120, d 120 to d 185, respectively), respectively
  3. 2The P values indicate main effects for antibiotic (Ant), protein level (CP) and their interaction (Ant x CP), respectively