Table 8. Effects of interaction between stocking density and air temperature on carcass composition and carcass grade during pre-slaughter pig transport

	LT			NT			HT			SE	p-value
	LD	ND	HD	LD	ND	HD	LD	ND	HD	SE	Treatments	Interaction
Pork composition (%)
Moisture	73.37^b	73.97^ab	74.04^ab	73.43^b	74.88^a	74.18^ab	74.79^a	74.03^ab	73.95^ab	0.24	< 0.001	< 0.001
Crude protein	21.67^bc	21.16^c	22.05^abc	22.45^ab	22.14^abc	22.87^a	22.11^abc	22.04^abc	21.63^bc	0.09	< 0.001	0.074
Crude fat	3.12^abc	3.29^ab	2.92^abc	2.81^bcd	2.05^de	1.35^e	2.48^cd	2.32^cd	3.66^a	0.08	< 0.001	< 0.001
Pork quality parameters
pH	5.45^bc	5.54^ab	5.58^ab	5.50^bc	5.65^a	5.56^ab	5.58^ab	5.53^abc	5.41^c	0.01	< 0.001	< 0.001
WHC (%)	61.17^cd	65.55^bc	61.45^cd	71.06^ab	75.02^a	62.86^cd	61.14^cd	58.80^d	59.25^d	0.67	< 0.001	< 0.001
DL (%)	4.73^b	3.49^cd	3.54^cd	4.57^b	3.18^d	4.86^b	3.68^cd	4.18^bc	6.89^a	0.11	< 0.001	< 0.001
CL (%)	27.66^bc	26.19^c	22.77^d	26.49^c	19.21^e	28.96^b	21.12^de	27.05^bc	36.23^a	0.44	< 0.001	< 0.001
L* value	53.24^b	46.73^c	50.78^bc	49.73^bc	46.96^c	51.24^bc	49.81^bc	50.59^bc	59.77^a	0.48	< 0.001	< 0.001
a* value	6.40^c	8.33^ab	6.47^c	6.22^c	8.30^ab	7.07^bc	9.11^a	6.87^bc	6.06^c	0.16	< 0.001	< 0.001
b* value	6.00^b	4.20^c	4.98^bc	4.54^c	4.39^c	4.20^c	5.28^bc	7.51^a	7.52^a	0.15	< 0.001	< 0.001
Sensory color¹⁾	3.08^ab	3.28^a	2.83^ab	3.30^a	3.40^a	2.67^ab	2.88^ab	2.43^b	2.79^ab	0.17	0.002	0.061
Marbling²⁾	3.50^a	3.33^a	3.43^a	2.70^ab	3.08^a	2.15^b	3.35^a	3.03^a	3.33^a	0.07	< 0.001	0.058
Pork quality classes (%)
PSE pork	20.0	0.0	0.0	0.0	0.0	13.3	0.0	6.7	40.0	-	-	-
RSE pork	6.7	0.0	0.0	20.0	0.0	13.3	0.0	0.0	33.3	-	-	-
RFN pork	20.0	86.7	66.7	46.7	93.3	40.0	53.3	60.0	0.0	-	-	-
PFN pork	53.3	13.3	33.3	33.3	6.7	33.4	46.7	33.3	26.7	-	-	-
DFD pork	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	-	-	-

Color score ranged from 1 (pale color) to 5 (dark color).
Marbling score ranged from 1 (practically devoid) to 5 (abundant).
Means in the same row with different superscripts differ (p < 0.05).
LT, low air temperature (lower than 10°C); NT, normal temperature (10°C to 24°C); HT, high temperature (higher than 24°C); LD, low density (lower than 0.43 m²/100 kg); ND, normal density (0.37 m²/100 kg to 0.43 m²/100 kg); HD, high density (higher than 0.37 m²/100 kg); PSE, pale, soft, exudative; RSE, red, soft, exudative; RFN, red, firm, non-exudative; PFN, pale, firm, non-exudative; DFD, dark, firm, dry.