Table 1.

Room temperatures (°C) during the experimental period.

	Age (d) of chickens
Experimental groups	1	3	5	7	9	11	13	15	17	19	21	23–35
Control	32	31	30	29	28	27	26	25	24	23	22	21–22
Cold-induced PHS	32	31	30	29	25	22	19	18	17	16	16	14–15