Table 4.

Pearson correlation coefficients between descriptive temperature parameters and methods (i.e., IR eye and rectal area maximum and average temperature and core body temperature) in Exp. 3

Temperature parameter	Correlation coefficients
	Age range	Maximum eye	Maximum rectal area	Average eye	Average rectal area
Core body	d5–14	0.16	0.31	0.06	0.17
	d5–77	0.24	0.38	0.15	0.16
	d14–28	0.21	0.32	0.17	0.23
	d28–56	0.31	0.47	0.23	0.23
	d56–77	0.32	0.38	0.21	0.16
Maximum eye	d5–14		0.60	0.63	0.50
	d5–77		0.57	0.73	0.51
	d14–28		0.59	0.71	0.52
	d28–56		0.54	0.72	0.45
	d56–77		0.56	0.75	0.44
Maximum rectal area	d5–14			0.39	0.71
	d5–77			0.46	0.68
	d14–28			0.44	0.72
	d28–56			0.43	0.66
	d56–77			0.46	0.61
Average eye	d5–14				0.47
	d5–77				0.54
	d14–28				0.44
	d28–56				0.44
	d56–77				0.56

Values derived from the core body temperature (as measured by rectal thermometer) and infrared images of the right eye and rectal area as captured by a single operator over five consecutive days for each of 205 calves aged between 5 and 77 d.