. 2017 Dec 19;31(6):919–925. doi: 10.5713/ajas.17.0545

Table 2.

Relationship between THI and physiological parameters related to heat stress in beef calves

Parameters	THI								SEM	p-value

	70.01	71.7	74.22	76.51	79.84	82.92	84.05	87.72
Heart rate (beat/min)	60.3^e	61.2^de	63.8^cde	65.5^cd	66.3^bc	70.5^ab	71.0^ab	73.0^a	1.06	<0.001
Rectal temperature (°C)	38.9^d	39.3^bc	39.4^bc	39.4^bc	39.3^c	39.5^bc	39.6^ab	39.9^a	0.06	<0.001
Feed intake (kg/d)	2.4	2.0	1.7	2.2	2.2	1.9	1.5	1.7	0.24	0.150
Water intake (L/d)	23.4^ab	24.8^ab	20.6^b	24.8^ab	27.8^ab	31.5^a	31.8^a	26.8^ab	1.98	0.006

THI, temperature humidity index; SEM, standard error of the mean.

^a,b,c,d,e

Values within a row with different superscripts are significantly different according to Tukey’s test at p<0.05.