Table 4. Effect of dietary supplementation of Silybum marianum seed (SMS) extract on the fecal gas emission in weaned piglets1)

Items (ppm) SMS extract (%) SEM p-value
0 0.05 0.10 Linear Quadratic
NH3
 Day 1 1.50 1.50 1.00 0.312 0.286 0.529
 Day 7 1.13 1.25 1.13 0.395 1.000 0.802
 Day 21 1.88 1.63 1.38 0.410 0.411 1.000
 Day 42 2.88 2.25 2.13 0.460 0.279 0.668
H2S
 Day 1 1.30 1.20 1.35 0.183 0.851 0.591
 Day 7 1.65 1.48 1.63 0.134 0.898 0.348
 Day 21 2.00 1.73 1.78 0.231 0.508 0.579
 Day 42 2.28 2.30 2.10 0.171 0.487 0.603
R-SH
 Day 1 2.50 3.25 3.00 0.301 0.270 0.207
 Day 7 3.13 3.25 3.50 0.232 0.283 0.831
 Day 21 3.25 3.00 3.13 0.232 0.712 0.526
 Day 42 3.75 3.00 3.38 0.331 0.443 0.198
Acetic acid
 Day 1 6.25 6.88 6.50 1.195 0.886 0.741
 Day 7 7.63 7.13 7.25 1.249 0.837 0.843
 Day 21 7.75 7.38 7.13 1.203 0.722 0.967
 Day 42 7.75 7.63 7.50 1.142 0.880 1.000
CO2
 Day 1 9,625.00 9,675.00 9,100.00 658.18 0.587 0.707
 Day 7 9,850.00 9,250.00 9,850.00 487.34 1.000 0.341
 Day 21 10,225.00 9,800.00 9,625.00 625.72 0.515 0.874
 Day 42 9,775.00 10,100.00 10,050.00 516.33 0.715 0.774
Values represent the means of eight pens with 2 pigs per replicate pen (n = 16) per treatment.
NH3, ammonia; H2S, hydrogen sulfide; R-SH, methyl mercaptans; CO2, carbon dioxide.