Table 1.

Comparison of heat stress indexes between heat tolerant (HT) and non-heat tolerant (NHT) Chinese Holstein dairy cows (M ± SEM).

	HT (n = 3)	NHT (n = 3)
HSP70 (pg/mL)	391 ± 59 a	183 ± 12 b
HSP90 (pg/mL)	2747 ± 196 a	1075 ± 84 b
Cortisol (ng/mL)	247 ± 19 a	144 ± 11 b
RT (°C)	38.7 ± 0.02 a	39.7 ± 0.05 b
RR (breaths/min)	57 ± 1 a	100 ± 6 b
Decline in milk yield (kg)	2.8 ± 0.9 a	10.7 ± 2.4 b

RT = Rectal Temperature; RR = Respiratory Rate; ^a,b different superscripts differ significantly at p < 0.05.