. 2024 Oct 29;13(11):881. doi: 10.3390/biology13110881

Table 6.

The digestive enzyme activities (U/g tissue) of yellow catfish fed diets with graded levels of Arg (g/kg) for 8 weeks.

Ingredient	Arg 0.179%	Arg 0.211%	Arg 0.236%	Arg 0.268%	Arg 0.295%	Arg 0.326%	p-Value
Stomach
Pepsin	967 ± 57.2 ^a	1057 ± 26.2 ^ab	1519 ± 26.8 ^c	1129 ± 22.4 ^b	1020 ± 65.5 ^ab	1042 ± 29.0 ^ab	0.023
Pancreas
Trypsin	20.6 ± 0.4 ^a	31.8 ± 2.1 ^bc	36.3 ± 3.3 ^bcd	42.0 ± 1.7 ^d	35.5 ± 1.6 ^bc	30.0 ± 1.4 ^b	<0.001
Chymotrypsin	27.6 ± 1.2 ^a	28.8 ± 1.6 ^a	33.6 ± 1.2 ^b	46.8 ± 3.6 ^d	36.0 ± 1.3 ^c	26.4 ± 0.6 ^a	0.019
Lipase	6.42 ± 0.48 ^a	8.80 ± 0.22 ^ab	9.59 ± 0.59 ^b	13.3 ± 0.86 ^c	9.84 ± 0.15 ^b	6.80 ± 0.23 ^a	<0.001
Amylase	1617 ± 33 ^a	2099 ± 84 ^ab	2255 ± 75 ^b	2121 ± 34 ^ab	2016 ± 34 ^ab	2028 ± 90 ^ab	0.025
Intestine
Trypsin	128 ± 3.3 ^a	145 ± 2.8 ^b	190 ± 6.8 ^d	199 ± 8.6 ^d	186 ± 2.8 ^d	162 ± 3.9 ^c	0.033
Chymotrypsin	60.1 ± 2.8 ^a	66.1 ± 6.0 ^a	118 ± 6.0 ^c	90.1 ± 2.1 ^b	92.5 ± 3.2 ^b	93.7 ± 3.6 ^b	<0.001
Lipase	2.10 ± 0.10 ^a	2.13 ± 0.11 ^ab	2.35 ± 0.09 ^ab	2.43 ± 0.09 ^bc	2.66 ± 0.12 ^c	2.27 ± 0.01 ^ab	0.046
Amylase	90.0 ± 9.3	93.7 ± 1.6	107 ± 9.9	105 ± 5.2	105 ± 7.8	90.9 ± 10.1	0.095
Regression
Y_{Intestine Trypsin} = −89.696X² + 483.244X − 457.516					X = 2.69	R² = 0.819
Y_{Pancreas Trypsin} = −26.725X² + 141.121X − 146.711					X = 2.64	R² = 0.823

Values are means ± S.E. of three replicate groups with 12 fish in each group, while quadratic regressions were run with the triplicate data points. Values within the same rows having different superscripts are significantly different (p < 0.05).