Table 4.

Delta (∆; final-initial) blood physiology parameters of temperature (T) and RH combinations (−10°C uncontrolled RH (−10), 21°C 30%RH (21/30), 21°C 80%RH (21/80), 30°C 30%RH (30/30), and 30°C 80%RH (30/80)), duration of exposure (D; 4, 8, and 12 h), and feather cover (FC; well [WF] and poorly-feathered [PF]) for white-feathered end-of-cycle hens.

Parameter1	T/RH combinations					P-value	D			P-value	FC		P-value	SEM
	-10	21/30	21/80	30/30	30/80		4h	8h	12h		WF	PF
∆pH	0	0.03	0.02	0.01	0.02	0.35	0b	0.02ab	0.04a	0.04	0.02	0.01	0.14	0.006
∆pCO2	−6.3	−8.1	−5.3	−7.8	−3.5	0.48	−3.2a	−5.5ab	−10.1b	0.02	−7.9b	−4.3a	<0.01	1.09
∆pO2	9.9a	−2.2ab	−4.5ab	1.0ab	−10.6b	0.03	−4.1	−1.2	−1.2	0.39	−2.0	−2.5	0.93	1.42
∆BE	−2.0	−0.8	−0.5	−1.6	0.1	0.12	−1.4	−0.6	−0.7	0.35	−1.0	−0.8	0.24	0.28
∆HCO3−	−1.9	−1.3	−0.8	−1.8	−0.2	0.11	−1.3	−0.9	−1.3	0.60	−1.3b	−0.9a	0.05	0.24
∆tCO2	−2.0	−1.6	−0.9	−2.0	−0.3	0.14	−1.3	−1.1	−1.6	0.65	−1.6b	−1.0a	0.02	0.25
∆sO2	2.7a	0.2ab	−0.9ab	1.5a	−2.9b	0.05	−1.8	0.1	1.5	0.10	0	−0.2	0.77	0.54
∆sodium	0.3c	1.9bc	2.6bc	3.9ab	4.7a	<0.01	2.0b	2.9ab	3.8a	0.04	2.8	3.0	0.31	0.31
∆glucose	−3.0b	−1.6a	−1.2a	−1.1a	−1.2a	<0.01	−1.3	−1.5	−1.7	0.06	−1.4	−1.6	0.07	0.12
∆hematocrit	−0.2	−0.1	0.1	0	0.8	0.68	−0.2	−0.2	0.8	0.09	−0.1	0.4	0.09	0.23
∆hemoglobin	0	0	0	0	0.2	0.62	0	−0.1	0.2	0.06	0	0.1	0.06	0.05
ΔH/L ratio	0.88a	0.04b	0.08b	0.18b	0.04b	<0.01	0.23	0.14	0.19	0.89	0.21	0.16	0.27	0.06

^a,b,cMeans within a main effect with different superscripts are significantly different (P ≤ 0.05).

¹Partial pressure of carbon dioxide (pCO₂; mm Hg), partial pressure of oxygen (pO₂; mm Hg), base excess in extracellular fluid compartment (BE; mmol/L), bicarbonate (HCO₃⁻; mmol/L), total carbon dioxide (tCO₂; mmol/L), sodium (mmol/L), glucose (mmol/L), hemoglobin (mmol/L), oxygen saturation (sO₂; %), hematocrit (%PVC), heterophil to lymphocyte ratio (H/L ratio).