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Table 2 Effects of organic acids on the apparent total tract digestibility of crude protein and energy and on nitrogen (N) retention in pigs (Source: [37])

From: A review of the effects of dietary organic acids fed to swine

  Level Crude protein Gross energy N retention
Organic acid (%) D (%) ΔD D (%) ΔD R (%) ΔR
Formic acid 1.4 80.6 +1.4 82.2 +0.7 48.3 +4.9*
Butyric acid 2.7 80.6 +1.4 82.2 +1.6* 48.3 +4.0*
Formic acid 1.8 80.6 −1.0 82.2 +0.7 48.3 +2.9*
Propionic acid 2.0 80.2 +2.3 77.9 +1.4 - -
  1. D digestibility of non-acidified control diet, ΔD percentage unit change in the digestibility relative to the non-acidified control diet, R N-retention of non-acidified control diet as a percentage of intake, ΔR percentage unit change in N-retention relative to the non-acidified control diet
  2. *significantly different from the control diet (P < 0.05)