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Table 2 Effects of dietary threonine levels on the growth performance of sub-adult grass carpg

From: Growth, digestive and absorptive capacity and antioxidant status in intestine and hepatopancreas of sub-adult grass carp Ctenopharyngodonidella fed graded levels of dietary threonine

Item Dietary Thr levels, g/kg diet
3.3 5.9 8.4 10.9 13.1 15.8
IBW, g/fish 442.0 ± 5.1a 441.6 ± 2.3a 442.6 ± 1.7a 442.2 ± 1.3a 441.6 ± 3.0a 441.4 ± 2.0a
FBW, g/fish 623.4 ± 20.4a 817.4 ± 11.1b 911.8 ± 26.3c 1,013.4 ± 35.2e 969.0 ± 28.2d 896.6 ± 41.7c
WG, g/fish 181.4 ± 19.1a 375.8 ± 10.8b 469.2 ± 26.4c 571.2 ± 34.2e 527.4 ± 27.8d 455.2 ± 42.8c
SGRh, %/day 0.61 ± 0.05a 1.10 ± 0.02b 1.29 ± 0.05c 1.48 ± 0.06d 1.40 ± 0.05d 1.26 ± 0.09c
FI, g/fish 464.4 ± 21.3a 762.0 ± 14.9b 926.1 ± 49.0d 1,074.5 ± 29.5f 1,023.0 ± 10.6e 872.7 ± 5.4c
FEi, % 38.98 ± 2.44a 49.35 ± 2.20b 50.83 ± 4.80b 53.22 ± 3.94b 51.57 ± 2.90b 52.17 ± 5.06b
PERj 1.39 ± 0.09a 1.76 ± 0.08b 1.81 ± 0.17 b 1.90 ± 0.14b 1.84 ± 0.10 b 1.86 ± 0.18 b
  1. IBW: Initial body weight, FBW: Final body weight, WG: Weight gain, SGR: Specific growth rate, FI: Feed intake, FE: Feed efficiency, PER: Protein efficiency ratio
  2. a,b,c,d,e,fMeans in the same row without a letter in common are significantly different (P< 0.05)
  3. gValues are mean ± SD (n = 5)
  4. hSpecific growth rate =100 × {[ln (mean final body weight)-ln (mean initial body weight)]/days}
  5. iFeed efficiency (%) =100× weight gain (g)/diet intake (g)
  6. jProtein efficiency ratio = weight gain (g)/protein intake (g)