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. 2022 May 28;10:305–318. doi: 10.1016/j.aninu.2022.05.004

Table 3.

Index formula for growth performance of on-growing grass carp (Ctenopharyngodon idella).

Item Formulas
PWG PWG (%) = 100 × [FBW (g/fish) – IBW (g/fish)]/IBW (g)
SGR SGR (%/d) = 100 × [ln FBW (g/fish) – ln IBW (g/fish)]/d
FE FE (%) = 100 × [FBW (g/fish) – IBW (g/fish)]/FI (g/fish)
ISI ISI (%) = 100 × Wet intestine weight (g)/Wet body weight (g)
ILI ILI (%) = 100 × Wet intestine length (cm)/Wet body length (cm)

PWG = percentage of weight gain; FBW = final body weight; IBW = initial body weight; SGR = specific growth rate; FE = feed efficiency; FI = feed intake; ISI = intestinal somatic index; ILI = intestinal length index.