Table 3 Effect of different dietary levels of L-threonineon and encapsulated butyric acid (ButiPEARL) on growth performance,HSI, and feed utilization of Nile tilapia (Oreochromis niloticus) fingerlings at three and six weeks of experiment

Length (cm)

10.6^d

12.8^c

12.36^c

13.3^c

12.38^c

14.42^b

13.82^b

15^a

14.24^b

15.5^a

14.52^b

15.55^a

Length gain (%)

3.7^c

2.2^d

5.46^b

0.94^e

5.22^b

2.03^d

6.98^a

1.18^de

7.04^a

1.26^de

7.68^a

1.03^e

Weight (g)

21.96^f

35.0^d

28.26^e

39.28^d

28.33^e

45.72^c

35.48^d

51.2^bc

38.94^cd

56.78^ab

42.28^c

58.03^a

WG (g)

7.36^d

13.04^c

13.56^c

11.02 ^cd

13.33^c

17.39^bc

20.65^bc

15.72^c

24.14^ab

17.84^bc

27.53^a

15.75^c

FCR (%/day)

2.736^a

2.02^ab

1.438^bc

2.83^a

1.53^b

1.56^b

0.93^cd

1.78^ab

0.82^cd

1.64^b

0.71^d

1.86^ab

WGR (%)

50.782 ^cd

59.79^c

92.07^c

40.77^d

89.35^c

62.51 ^cd

139.35^b

45.15^d

163.68^ab

48.16^d

187.03^a

39.27

SGR (%/day)

1.938^c

2.22^bc

3.1^b

1.57^d

3.01^b

2.28^bc

4.15^a

1.74^cd

4.57^a

1.83^c

4.99^a

1.54

Liver weight (g)

0.38^d

0.62^bc

0.58^cd

1.0^b

0.57 ^cd

2.45^a

0.83^bc

1.37^ab

0.87^bc

1.46^ab

0.99^b

2.06^a

HSI (%)

1.742^d

1.78^cd

2.026^c

2.52^bc

2.02^c

5.22^a

2.33^c

2.68^bc

2.21^c

2.57^bc

2.33^c

3.53^b