Effect of dietary protein level on growth performance, indicators of enteric health, and gastrointestinal microbial ecology of weaned pigs induced with postweaning colibacillosis1,2

The effect of dietary CP level on performance, enteric health, and gastrointestinal microbial ecology of weaned pigs challenged with enterotoxigenic Escherichia coli K88 was investigated in a 14-d study

F. O. Opapeju; D. O. Krause; R. L. Payne; M. Rademacher; C. M. Nyachoti

2009

Scholarcy highlights

  • The effect of dietary CP level on performance, enteric health, and gastrointestinal microbial ecology of weaned pigs challenged with enterotoxigenic Escherichia coli K88 was investigated in a 14-d study
  • Forty weaned pigs, housed 4 per pen, were randomly assigned to 2 diets 22.5% CP or 2) 17.6% CP supplemented with AA
  • Isoleucine and Val were added to the 17.6% CP diet up to the level in the 22.5% CP diet
  • Pigs fed the 22.5% CP diet had greater ADG and G:F than those fed the 17.6% CP diet before infection, but performance was similar between the 2 diets after ETEC challenge and overall
  • On d 3 after challenge, ETEC was not detected in the ileal digesta of pigs fed the 17.6% CP diet but was detected in the ileal digesta of 80% of pigs fed the 22.5% CP diet
  • Pigs fed the 17.6% CP diet had a greater prevalence of order Clostridiales, family Lachnospiraceae, and genus Roseburia in the colon digesta 7 d after challenge compared with those fed the 22.5% CP diet
  • A reduction in the dietary CP level of weaned pigs from 22.5 to 17.6% with AA supplementation impaired growth performance before, but not after, the ETEC challenge and increased the relative composition of butyrate producing bacteria in the colon digesta after ETEC challenge

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