Table 2 Principal components extracted from long-term spectral datasets that revealed significant effects in the four trials.

From: Evaluating the impact of housing modifications on milk infrared spectra as indicators of dairy cow welfare status

Trials1

Spectral Dataset2

PC3

Eigenvalue

Explained Variation %

P Values

TCL

VN FD

6

4.75

1.70

Trt4

Block

   

0.032

0.088

   

SW

VN Raw

5

3.13

1.13

Trt4

Block

   

0.042

< 0.001

   

MW/SL

FD

6

4.92

1.77

length

Seq

Block

Trt4

Period

0.036

0.038

0.375

0.276

0.912

  1. The table also lists P values obtained from the SAS PROC MIXED Procedure for tested effects in each trial.
  2. 1TCL = tie chain length trial, SW = stall width trial, MW/SL = manger wall/stall length trial, 2 FD = first derivative, VN = vector normalized, 3 PC = principal component, 4 Trt = treatment.
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