TABLE 1.

Cold induction for all groups of chickens (compared with standard temperature)

	Age (day) of chickens
	1	3	5	7	9	11	13	15	17	19	21	23–35
Standard condition	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

PHS = pulmonary hypertension syndrome.