Effects of fishmeal replacement by soy protein concentrate on growth performance, apparent digestibility, and retention of protein and amino acid in juvenile pearl gentian grouper

Effects of fishmeal replacement by soy protein concentrate on growth performance, apparent digestibility, and retention of protein and amino acid in juvenile pearl gentian grouper

Cite: Chen, Yan, et al. “Effects of the replacement of fishmeal by soy protein concentrate on growth performance, apparent digestibility, and retention of protein and amino acid in juvenile pearl gentian grouper…” PLOS ONE 14.12 (2019).

General Information

Background

Synechogobius hasta:

（图片转自 hx888.com，版权属于原作者）

Abstract

1. Substitute gradient
2. SPC15 has a best growth performance
3. SPC75 has a worst growth performance
4. SPC15 and SPC30 had the highest protein efficiency ratio
5. Daily feed intake was significantly decreased
6. Survival rate were higher in SPC15, SPC30, and SPC45
7. SPC15 and SPC30 showed significantly higher protein and amino acid (AA) retention

Introduction

###P1: BG
BG of Aquaculture

P2: BG

BG of Soybean meal in Aquaculture

P3: BG

BG of Pearl Gentian Grouper

M&M

• Diet formulation
• Feeding trial
• Sample collection and calculation formula for growth performance
• Biochemical analysi
• Statistical analysis
• QEthical statement

Results

• Growth performance and biometry
• Nutritional composition
• Protein and individual AA ADCs and retention in muscle

Growth performance and biometry

• Survival
  • SPC 15, SPC 30, and SPC 45 (from 94% to 96%) as compared to SPC 60 and SPC 75 (P < 0.05)
• BWG, WGR, SGR, and PER
  • SPC15
  • BWG: average body weight gain; WGR: Weight gain ratio; SGR: specific growth rate, survival; PER: protein efficiency ratio
• FCR (feed conversion ratio)
  • SPC15
• DFI (Daily feed intake)
  • SPC0

Nutritional composition

• Muscle protein
  • SPC0, SPC15, SPC30 > SPC45, SPC60, SPC75
• Whole Body
  • Moisture content gradually increased
• Crude protein
  • SPC30, SPC45 > SPC60, SPC75
• Muscle AA
  • histidine, lysine and methionine
    • Negative related
    • Methionine: H, SPC30; L, SCP75
    • Lysine: H, SPC15； L，SPC75

Discussion

P1 Introduction

• Other studies
• This experiment

P2 Regression Model

Predict the best ratio for Growth performance improving

P3 Tolerate Comparing

Some fish have high tolerate of plant meal but not Grouper

P4 Growth Performance & feed intake

Growth performance related but not depend by feed intake.
The best growth performance is SPC15, but the highest uptake ratio is SPC0

P5 Poor Nutrition Value

Anti Nutrition Factors (ANF) & Lower Content of Amino Acids

• ANF
  • phytic acid, trypsin inhibitor, raffinose, and glycinin
  • phytic, trypsin: feed intake and growth

P6-7 Phytic and Trypsin

• Mild effects on growth compared with previous studies: We have a lower concentration of phytic as well as trypsin.
• (Other studies) reduction in the bio-availability of Phosphorus, Calcium, Magnesium, and Zinc

P8-9 General Conclusion

P10 Summary

Conclusion

SPC 11-14% can optimize the growth performance.
SPC30 can still remain beneficial for the grouper.