Skip to main content

Advertisement

Table 5 Effect of SC supplementation on rumen microbial populations and percentage of target species relative to total bacteria of steers fed diets with different concentrate-to-forage ratios

From: Effect of Saccharomyces cerevisiae on alfalfa nutrient degradation characteristics and rumen microbial populations of steers fed diets with different concentrate-to-forage ratios

Item CTFR SEM SC SEM P-value Probability3
  30:70 50:50 70:30 90:10   N1 Y2   CTFR SC CTFR × SC Linear Quadratic Cubic
Total bacteria, 6.95 9.62 13.08 6.21 1.09 7.86 10.07 0.77 <0.01 0.05 0.61 0.82 <0.01 0.04
×1010 copies/mL
Rumen fungi, 6.57 5.10 11.80 3.57 0.91 5.99 7.51 0.64 <0.01 0.10 0.22 0.63 <0.01 <0.01
×105 copies/mL
Protozoa, 4.03 3.64 17.44 7.44 1.47 6.74 9.54 1.04 <0.01 0.06 0.30 <0.01  <0.01 <0.01
×105 copies/mL
Percentage relative to total bacteria           
R. flavefaciens 0.45 0.20 0.28 0.16 0.03 0.25 0.29 0.02 <0.01 0.25 0.87 <0.01 0.07 <0.01
R. ablus 0.02 0.01 0.01 0.00 0.00 0.01 0.01 0.00 <0.01 0.63 0.08 <0.01 0.40 0.02
FibSuc 4 1.03 0.39 0.23 0.11 0.09 0.46 0.43 0.06 <0.01 0.72 0.85 <0.01 0.03 0.41
ButFib 5 0.01 0.01 0.00 0.00 0.00 0.01 0.01 0.00 <0.01 0.37 0.61 <0.01 0.68 0.75
StrBov 6 0.03 0.05 0.01 0.01 0.00 0.03 0.02 0.00 <0.01 0.64 0.83 <0.01 <0.01 <0.01
RumAmy 7 0.13 0.14 0.10 0.07 0.01 0.12 0.10 0.01 <0.01 0.01 0.53 <0.01 0.03 0.19
SelRum 8 3.10 3.24 1.80 1.07 0.21 2.04 2.55 0.15 <0.01 0.02 0.46 <0.01 0.09 0.05
Lactobacillus 9 0.02 0.02 0.04 0.05 0.01 0.04 0.03 0.01 <0.01 0.16 0.73 <0.01 0.51 0.14
  1. 1N: without yeast supplementation;
  2. 2Y: with yeast supplementation;
  3. 3Linear indicates linear effect of dietary CTFR; quadratic indicates a quadratic effect of dietary CTFR; cubic indicates a cubic effect of dietary CTFR;
  4. 4FibSuc: Fibrobacter succinogenes;
  5. 5ButFib: Butyrivibrio fibrisolvens;
  6. 6StrBov: Streptococcus bovis;
  7. 7RumAmy: Ruminobacter amylophilus;
  8. 8SelRum: Selnomonas ruminantium;
  9. 9Lactobacillus: Lactobacillus species.