Table 4.
The optimal dietary lysine levels based on different indices for grown-up grass carp (Ctenopharyngodon idella).
| Item | Regressive equation | R2 | P-value | Optimal dietary lysine level, g/kg | 
|---|---|---|---|---|
| PWG | Y = −1.495 X2 + 40.618X −36.922 | 0.931 | <0.05 | 13.58 | 
| Skin lesion morbidity | Y = 0.215X2 - 5.81X + 47.947 | 0.888 | <0.05 | 13.51 | 
| Head kidney lysozyme activity | Y = −1.435X2 + 40.7X −80.103 | 0.936 | <0.01 | 14.18 | 
| Spleen lysozyme activity | Y = −0.849X2 + 24.717X - 4.611 | 0.899 | <0.01 | 14.56 |