Improving Heat Resistance of Nile Tilapia (Oreochromis niloticus) by Dietary Zinc Supplementation

Table 4

Effects of Nile tilapia fed different levels (20 or 40 mg zinc/kg feed) and sources of zinc for 45 days on intestinal morphology.

Item	Intestinal villus length (μm)	Intestinal villus width (μm)	Absorption surface area (ASA, μm^2)
CT	^c		^b
20 ZnSO4	^bc		^b
40 ZnSO4	^b		^ab
20 Thr-Zn	^bc		^b
40 Thr-Zn	^a		^a

Different superscript letters indicate significant difference ().