Table 3.

The number of significant environmental factors (no. of factors), associated R², the most influential environmental factor (MIF), and the R² when only the MIF is included in the model (R² with MIF) for each descriptive temperature parameters (DTP)

DTP1	R 2	No. of factors	MIF2	R 2 with MIF
Avg	0.53	7	Amb2hmax	0.36
PA32	0.51	6	Amb2hmax	0.35
Max	0.50	5	Amb2hmax	0.30
Wmax0.5	0.49	5	Amb2hmax	0.31
Tavg32	0.48	7	Amb2hmax	0.29
Wmax2.0	0.48	5	Amb2hmax	0.30
AIDM	0.45	7	Days unshaven	0.23
PA35	0.41	7	Amb2hmax	0.23
Tavg35	0.40	5	Amb2hmax	0.25
ACT	0.39	6	Days unshaven	0.18
AE	0.37	6	Days unshaven	0.12
Min	0.36	7	Amb2hmax	0.23
Mxavg	0.34	5	Amb2hmax	0.21
AASM	0.29	7	Days unshaven	0.10
ASOS	0.27	5	Amb2hmax	0.11
PAM-2.0	0.23	6	Amb2hmax	0.09
PAM-0.5	0.07	5	Amb1h	0.03
AC	0.06	4	Amb1h	0.03

¹Avg = average temperature of an udder quarter; AASM = average angular second moment; ACT = average contrast; AC = average correlation; ASOS = average sum of squares; AIDM = average inverse difference moment; AE = average entropy; Max = maximum temperature of an udder quarter; Min = minimum temperature of an udder quarter; Mxavg = average of the 3 × 3 pixel region with its center lies on the hottest pixel in an udder quarter; PA32 = percentage of pixels above 32 °C in an udder quarter; PA35 = percentage of pixels above 35 °C in an udder quarter, PAM-2.0 = percentage of pixels within 2.0 °C of the maximum temperature; PAM-0.5 = percentage of pixels within 0.5 °C of the maximum temperature; Tavg32 = average temperature of all pixels above 32 °C; Tavg35 = average temperature of all pixels above 35 °C; Wmax2.0 = average temperature of all pixels within 2 °C of the maximum temperature; Wmax0.5 = average temperature of all pixels within 0.5 °C of the maximum temperature.

²Amb2hmax = the maximum ambient temperature observed 2 h before imaging; Days unshaven = the number of days since the udder was shaven; Amb1h = the ambient temperature at the time of imaging.