Influence of Dietary Phosphorus on the Growth, Feed Utilization, Proximate Composition, Intestinal Enzymes, and Oxidation Resistance of Sea Cucumber Apostichopus japonicus

Table 4

Intestinal enzymes of sea cucumber fed diets with different phosphorus levels.

	Dietary phosphorus level (%)						Pooled SE
	0.24	0.37	0.51	0.62	0.77	0.89
Digestive enzymes
ACPT^1 (U/mg prot)							0.013
AKPT^2 (U/mg prot)	^c	^b	^b	^a	^a	^a	4.317
Amylase (U/mg prot)	^a	^ab	^bc	^c	^bc	^bc	0.546
Lipase (U/g prot)	^a	^b	^b	^b	^b	^b	0.273
Metabolic enzymes (U/g prot)
ALP^3	^a	^b	^cd	^d	^c	^b	2.807
AST^4 (×10^1)	^d	^cd	^b	^bc	^ab	^a	2.800
ALT^5 (×10^2)							61.512
HK^6							0.878
PK^7	^a	^a	^a	^b	^b	^b	1.518
PFK^8	^a	^ab	^b	^b	^ab	^ab	0.417
PEPCK^9	^c	^c	^bc	^ab	^ab	^a	2.087
CS^10							0.149
SDH^11	^a	^a	^b	^b	^b	^a	0.153

Notes: values in the same row with different superscript letters show significant difference (). ¹Acid protease (ACPT, U/mg prot); ²alkaline protease (AKPT, U/mg prot); ³alkaline phosphatase (ALP, U/g prot); ⁴aspartate transaminase (AST, U/g prot); ⁵alanine transaminase (ALT, U/g prot); ⁶hexokinase (HK, U/g prot); ⁷pyruvate kinase (PK, U/g prot); ⁸phosphofructokinase (PFK,U/g prot); ⁹phosphoenolpyruvatecarboxykinase (PEPCK, U/g prot); ¹⁰citrate-synthase (CS, U/g prot); ¹¹succinate dehydrogenase (SDH, U/g prot).