. 2021 May 15;99(7):skab156. doi: 10.1093/jas/skab156

Table 5.

The effects of LPS inclusion (control, LPS50 [50], LPS100 [100]) and aging (1 or 14 d) on objective (L*, a*, b*) and subjective percentage discoloration (%), and delta E values (n = 29)

Variable	Age	Treatment¹				P-values
		Control	50	1,000	SEM	Trt	Age	Day	Trt*Age	Trt*Day	Age*Day	TrtAgeDay
L* ²	1	44.37	45.47	45.82	0.64	0.002	0.68	<0.0001	0.92	0.99	<0.0001	0.99
	14	44.36	45.73	46.06
	$\bar{x}$	44.37^b	45.6^ab	45.97^a
a* ²	1	13.7^Ay	13.67^Ay	13.31^Ay	0.26	0.01	<0.0001	<0.0001	0.0008	0.96	0.05	0.18
	14	15^Bx	16.01^Ax	15.7^Ax
b* ²	1	6.93^C	8.2^A	7.39^BC	0.29	0.12	0.12	<0.0001	0.02	0.99	<0.0001	0.78
	14	7.88^A	7.55^A	8.04^A
Percent discolorati-on	1	7.81^A	3.34^A	9.27^A	3.70	0.35	0.22	<0.0001	0.02	0.99	0.48	0.74
	14	16.43^A	3.32^B	5.58^B
ΔE³	1	6.01	4.46	6.18	1.42	0.19	0.74	n/a	0.07	n/a	n/a	n/a
	14	7.66	4.07	4.27

¹Control, saline injection; LPS50, 50 ng LPS/kg BW; LPS100, 100 ng LPS/kg BW.

²L*, black to white color space; 100 = light (white), 0 = dark (black); a*, red to green color space; + value (red), − value (green); b*, yellow to blue color space; + value = yellow, − value = blue.

³Larger delta (ΔE) values indicate a larger change in overall color over time; ΔE = [(ΔL* ²)+(Δa* ²)+ Δb* ²)]^0.5.

^a,b,cMeans within the same variable with different superscripts denote treatment differences (P < 0.05).

^x,yMeans within the same variable with different superscripts denote age differences (P < 0.05).

^A,B,CMeans within the same variable with different superscript denote Trt*age interactions (P < 0.05).