Table 5.
Glutamate-oxaloacetate transaminase (GOT) and glutamate-pyruvate transaminase (GPT) activities in the hepatopancreas and plasma ammonia contents of grown-up grass carp (Ctenopharyngodon idella) fed with diets containing graded levels of lysine for 60 d.1
| Item | Dietary lysine level, g/kg diet |
|||||
|---|---|---|---|---|---|---|
| 5.6 | 8.5 | 11.6 | 14.4 | 17.5 | 20.7 | |
| GOT activities in hepatopancreas, U/g tissue | 1,733.90 ± 82.87a | 1,968.90 ± 23.41c | 2,146.61 ± 43.95d | 2,390.82 ± 68.24e | 1,945.12 ± 49.07c | 1,816.86 ± 36.88b |
| GPT activities in hepatopancreas, U/g tissue | 577.81 ± 14.90b | 605.94 ± 21.83c | 635.98 ± 13.47d | 611.26 ± 42.16cd | 559.26 ± 15.24b | 514.83 ± 16.16a |
| Plasma ammonia contents, μmol/L | 236.38 ± 16.89c | 197.24 ± 10.95b | 151.88 ± 12.47a | 150.79 ± 8.02a | 192.77 ± 14.39b | 220.48 ± 20.49c |
| Regressions | ||||||
| YGOT activity in thehepatopancreas = -8.394X2 + 225.544X + 708.163 | R2 = 0.798 | P = 0.091 | ||||
| YGPT activity in the hepatopancreas = -1.326X2 + 31.224X + 450.609 | R2 = 0.951 | P < 0.05 | ||||
| YPlasma ammonia contents = -1.330X2 - 35.768X + 396.743 | R2 = 0.927 | P < 0.05 | ||||
a to d Values with different letter superscripts are significantly different (P < 0.05).
1
Values are means ± SD (n = 6).