Evaluation of Chlorogenic Acid Supplementation in Koi (Cyprinus carpio) Diet: Growth Performance, Body Color, Antioxidant Activity, Serum Biochemical Parameters, and Immune Response

Table 4

Body color and total carotenoid of koi fed the experimental diets for ten weeks.

Item	Control	CGA-2	CGA-4	CGA-6	CGA-8	ANOVA	Regression^1
						value	Model	value		Op. level
Body color
						0.00	Ln	0.00	0.36	—
						0.05	Ln	0.01	0.21	—
						0.03	Ln	0.04	0.14	—
Total carotenoid (mg/kg)
Muscle						0.02	NR	—	—	—
Epidermis						0.09	NR	—	—	—
Scale						0.00	Qd	0.00	0.52	381.84

Note: means in the same row with different superscripts are significantly different (). ¹Regression: Ln: Linear; Qd: Quadratic; Cu: Cubic; NR: No relationship; Op. level: Optimal level of CGA.