Table 1.

Composition (g/kg diet) of the experimental diets

Ingredient	Control diet	Flesh diet	Skin diet	Extract diet
Casein (g)	200	200	200	200
Cornflour (g)	350	250	250	348.7
Sugar (g)	200	200	200	200
Safflower oil (g)	100	100	100	100
Lard (g)	100	100	100	100
AIN vitamin mix (g)	10	10	10	10
AIN mineral mix (g)	35	35	35	35
DL-methionine (g)	3	3	3	3
Choline bitartrate (g)	2	2	2	2
Purple sweet potato (flesh) (g)	-	100	-	-
Purple sweet potato (skin) (g)	-	-	100	-
Anthocyanin-rich extract (g)	-	-	-	1.21

Approximately 20 kg of each diet was prepared and consumed by animals over the course of the study.