Skip to main content

Table 2 Linear mixed regression model for somatic cell count, bacterial count, apoptotic and necrotic neutrophils

From: Local host response following an intramammary challenge with Staphylococcus fleurettii and different strains of Staphylococcus chromogenes in dairy heifers

Predictor variables Ln SCC (cells/µL) Log (CFU/mL + 1) Ln apoptotic PMN (%) Ln necrotic PMN (%)
βa SEb LSMc P β SE LSM P β SE LSM P β SE LSM P
Intercept 3.43 0.34 <0.01d 0.52 0.16 <0.01d 3.16 0.19 <0.01d 2.72 0.11 <0.01d
Inoculum     <0.01d     <0.01d     <0.01d     <0.01d
 Control Ref.e 3.91 Ref. −0.03 Ref. 3.48 Ref. 3.15
 S. fleurettii    6.07 <0.01f    0.22 0.25f    2.85 0.01f    2.79 0.03f
 S. chromogenes TA    5.78 <0.01f    0.50 <0.01f    3.06 0.13f    2.90 0.29f
 S. chromogenes IM    6.71 <0.01f    0.89 <0.01f    2.92 0.02f    2.85 0.10f
Time of sampling 0.06 0.01 <0.01d −0.05 0.01 <0.01d 0.01 0.00 <0.01d 0.02 0.15 <0.01d
Quadratic term of time of sampling 0.00 0.00 <0.01d 0.00 0.00 <0.01d     NSg     NS
Inoculum × time of sampling <0.01d <0.01d 0.02d 0.01d
  1. aRegression coefficient.
  2. bStandard error.
  3. cLeast square means.
  4. d P value for overall effect.
  5. eReference.
  6. fBonferroni-adjusted P value for comparing different inocula with control.
  7. gNot significant.