TABLE 3

Bacterial density in the small intestinal communities of preweaned calves

ParameterMean ± SEM and P valuesc
RegionAgeSample type
PJDJILP1 wk3 wk6 wkPLumenMucosaP
Total bacteriaa(2.11 ± 1.44) × 1010(9.98 ± 6.72) × 109(5.41 ± 3.19) × 1090.15(1.01 ± 0.7) × 1010(5.98 ± 3.67) × 109(2.04 ± 1.38) × 10100.21(2.26 ± 1.57) × 1010A(1.71 ± 0.5) × 109B<0.01
Lactobacillusb (%)2.91 ± 1.802.88 ± 1.371.55 ± 1.340.763.52 ± 2.422.85 ± 2.310.24 ± 0.230.174.41 ± 3.31A0.007 ± 0.004B<0.01
Bifidobacteriumb (%)13.11 ± 5.1010.17 ± 2.528.18 ± 2.140.149.9 ± 2.6910.76 ± 3.1510.8 ± 4.250.9412.66 ± 4.138.31 ± 2.610.02
  • a That is, the total bacterial density (16S rRNA gene copy/g of fresh sample).

  • b That is, (Lactobacillus or Bifidobacterium 16S rRNA gene copy/total bacterial copy number) × 100.

  • c The presence of a superscript A and B indicates that the Bifidobacterium densities differed for the lumen and mucosa of PJ. PJ, proximal jejunum; DJ, distal jejunum; IL, ileum.