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. 2013 Apr 8;9:67. doi: 10.1186/1746-6148-9-67

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 cows1

 
 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 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.