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Table 1 Final mixed linear regression models of the effect of seasonality, mastitis-causing pathogens and somatic cell count on milk composition at the mammary quarter level in Gyr cows 1

From: Effect of somatic cell count and mastitis pathogens on milk composition in Gyr cows

  Lactose, % Protein, % Fat, % Nonfat solids, % Total solids, %
Fixed effects β SE P-value β SE P-value β SE P-value β SE P-value β SE P-value
Intercept 4.660 0.081   3.662 0.087   1.689 0.335   9.295 0.098   11.004 0.427  
Seasonality2                
 Dry Ref. Ref. Ref. Ref. Ref.
 Rainy 0.105 0.015 <.0001 −0.322 0.012 <.0001 −0.208 0.039 <.0001 −0.222 0.018 <.0001 −0.437 0.044 <.0001
IMI3                
 Negative Ref. Ref. Ref. Ref. Ref.
 S. aureus −0.041 0.024 0.089 −0.044 0.019 0.023 −0.082 0.062 0.183 −0.091 0.029 0.002 −0.191 0.071 0.007
 CNS4 −0.023 0.022 0.294 −0.033 0.018 0.062 −0.175 0.057 0.002 −0.063 0.027 0.017 −0.241 0.065 0.0002
 CORY5 −0.082 0.021 0.0002 0.052 0.017 0.003 −0.138 0.055 0.012 −0.015 0.025 0.554 −0.161 0.063 0.010
 STREP5 −0.062 0.037 0.092 −0.031 0.029 0.297 −0.232 0.095 0.014 −0.099 0.044 0.023 −0.346 0.107 0.001
SCC6 −0.0002 0.00004 <.0001 0.00005 0.00004 <.0001 0.0002 0.00001 <.0001 −0.0002 0.00005 <.0001 0.00005 0.00002 <.0001
  1. 1 A total of 3,203 observations were used in this analysis. 2Seasonality (1 = rainy season, October to March; 0 = dry season, April to September), 3 IMI: intramammary infection; 4CNS: coagulase negative staphylococci, 5 CORY: Corynebacterium spp., 6 STREP: Streptococcus sp. (S. uberis, S. agalactiae, S. dysgalactiae), 6 SCC: somatic cell count (x 1000 cells/mL), β: estimated coefficients, SE: standard error for the coefficient, Ref.: reference.