Effect of constant digestible protein intake and varying digestible energy levels on energy and protein utilization in Nile tilapia

M.N. Haidar, S. Bleeker, L.T.N. Heinsbroek, J.W. Schrama

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

In literature, the variability in the estimated optimal digestible protein to digestible energy ratio (DP/DE) is high. The present study aimed to estimate the optimal DP/DE ratio in Nile tilapia (Oreochromis niloticus) using different criteria (performance, energy and nitrogen balances parameters). Duplicate aquaria were randomly assigned to one of 16 diets. These diets covered a wide range of dietary DP/DE ratio (from 16.7 to 27 g MJ −1 ). DP levels ranged between 36 and 50% and DE levels between 17.5 and 22 MJ kg −1 . Fish were fed restrictively based on a similar digestible protein amount at all 16 diets. Initial fish weight was 6.7 g. Broken line analysis showed that no optimal DP/DE ratio was present for Nile tilapia within the DP/DE ratio range studied. Regression analysis showed that growth declined as DP/DE ratio increased and seemed to level off at high DP/DE ratio (25 g MJ −1 ). FCR ranged between 0.8 and 1.1 and increased linearly with increasing DP/DE ratio. Decreasing the DP/DE ratio resulted in a linear increase in protein efficiency to a highest value of 53%. However, protein efficiency did not show a plateau or a maximum value. Moreover, decreasing the DP/DE ratio resulted in a very high fat content of the fish (over 16%). In conclusion, an optimal DP/DE ratio in Nile tilapia being fed restrictively seems to be absent or to be below 16 g MJ −1 . A maximum protein deposition level is not present in 5–40 g Nile tilapia.
Original languageEnglish
Pages (from-to)28-35
JournalAquaculture
Volume489
DOIs
Publication statusPublished - 20 Mar 2018

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digestible energy
Oreochromis niloticus
digestible protein
protein intake
protein
energy
proteins
effect
diet
fish
protein deposition
nitrogen balance
aquariums
energy balance
aquarium
plateaus
regression analysis
lipid content
fat

Keywords

  • Digestible energy
  • Digestible protein
  • Energy utilization
  • Feed evaluation
  • Protein efficiency
  • Protein/Energy ratio

Cite this

@article{46618abdfe8f4a40b6ab55ce3df68364,
title = "Effect of constant digestible protein intake and varying digestible energy levels on energy and protein utilization in Nile tilapia",
abstract = "In literature, the variability in the estimated optimal digestible protein to digestible energy ratio (DP/DE) is high. The present study aimed to estimate the optimal DP/DE ratio in Nile tilapia (Oreochromis niloticus) using different criteria (performance, energy and nitrogen balances parameters). Duplicate aquaria were randomly assigned to one of 16 diets. These diets covered a wide range of dietary DP/DE ratio (from 16.7 to 27 g MJ −1 ). DP levels ranged between 36 and 50{\%} and DE levels between 17.5 and 22 MJ kg −1 . Fish were fed restrictively based on a similar digestible protein amount at all 16 diets. Initial fish weight was 6.7 g. Broken line analysis showed that no optimal DP/DE ratio was present for Nile tilapia within the DP/DE ratio range studied. Regression analysis showed that growth declined as DP/DE ratio increased and seemed to level off at high DP/DE ratio (25 g MJ −1 ). FCR ranged between 0.8 and 1.1 and increased linearly with increasing DP/DE ratio. Decreasing the DP/DE ratio resulted in a linear increase in protein efficiency to a highest value of 53{\%}. However, protein efficiency did not show a plateau or a maximum value. Moreover, decreasing the DP/DE ratio resulted in a very high fat content of the fish (over 16{\%}). In conclusion, an optimal DP/DE ratio in Nile tilapia being fed restrictively seems to be absent or to be below 16 g MJ −1 . A maximum protein deposition level is not present in 5–40 g Nile tilapia.",
keywords = "Digestible energy, Digestible protein, Energy utilization, Feed evaluation, Protein efficiency, Protein/Energy ratio",
author = "M.N. Haidar and S. Bleeker and L.T.N. Heinsbroek and J.W. Schrama",
year = "2018",
month = "3",
day = "20",
doi = "10.1016/j.aquaculture.2017.12.035",
language = "English",
volume = "489",
pages = "28--35",
journal = "Aquaculture",
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}

Effect of constant digestible protein intake and varying digestible energy levels on energy and protein utilization in Nile tilapia. / Haidar, M.N.; Bleeker, S.; Heinsbroek, L.T.N.; Schrama, J.W.

In: Aquaculture, Vol. 489, 20.03.2018, p. 28-35.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effect of constant digestible protein intake and varying digestible energy levels on energy and protein utilization in Nile tilapia

AU - Haidar, M.N.

AU - Bleeker, S.

AU - Heinsbroek, L.T.N.

AU - Schrama, J.W.

PY - 2018/3/20

Y1 - 2018/3/20

N2 - In literature, the variability in the estimated optimal digestible protein to digestible energy ratio (DP/DE) is high. The present study aimed to estimate the optimal DP/DE ratio in Nile tilapia (Oreochromis niloticus) using different criteria (performance, energy and nitrogen balances parameters). Duplicate aquaria were randomly assigned to one of 16 diets. These diets covered a wide range of dietary DP/DE ratio (from 16.7 to 27 g MJ −1 ). DP levels ranged between 36 and 50% and DE levels between 17.5 and 22 MJ kg −1 . Fish were fed restrictively based on a similar digestible protein amount at all 16 diets. Initial fish weight was 6.7 g. Broken line analysis showed that no optimal DP/DE ratio was present for Nile tilapia within the DP/DE ratio range studied. Regression analysis showed that growth declined as DP/DE ratio increased and seemed to level off at high DP/DE ratio (25 g MJ −1 ). FCR ranged between 0.8 and 1.1 and increased linearly with increasing DP/DE ratio. Decreasing the DP/DE ratio resulted in a linear increase in protein efficiency to a highest value of 53%. However, protein efficiency did not show a plateau or a maximum value. Moreover, decreasing the DP/DE ratio resulted in a very high fat content of the fish (over 16%). In conclusion, an optimal DP/DE ratio in Nile tilapia being fed restrictively seems to be absent or to be below 16 g MJ −1 . A maximum protein deposition level is not present in 5–40 g Nile tilapia.

AB - In literature, the variability in the estimated optimal digestible protein to digestible energy ratio (DP/DE) is high. The present study aimed to estimate the optimal DP/DE ratio in Nile tilapia (Oreochromis niloticus) using different criteria (performance, energy and nitrogen balances parameters). Duplicate aquaria were randomly assigned to one of 16 diets. These diets covered a wide range of dietary DP/DE ratio (from 16.7 to 27 g MJ −1 ). DP levels ranged between 36 and 50% and DE levels between 17.5 and 22 MJ kg −1 . Fish were fed restrictively based on a similar digestible protein amount at all 16 diets. Initial fish weight was 6.7 g. Broken line analysis showed that no optimal DP/DE ratio was present for Nile tilapia within the DP/DE ratio range studied. Regression analysis showed that growth declined as DP/DE ratio increased and seemed to level off at high DP/DE ratio (25 g MJ −1 ). FCR ranged between 0.8 and 1.1 and increased linearly with increasing DP/DE ratio. Decreasing the DP/DE ratio resulted in a linear increase in protein efficiency to a highest value of 53%. However, protein efficiency did not show a plateau or a maximum value. Moreover, decreasing the DP/DE ratio resulted in a very high fat content of the fish (over 16%). In conclusion, an optimal DP/DE ratio in Nile tilapia being fed restrictively seems to be absent or to be below 16 g MJ −1 . A maximum protein deposition level is not present in 5–40 g Nile tilapia.

KW - Digestible energy

KW - Digestible protein

KW - Energy utilization

KW - Feed evaluation

KW - Protein efficiency

KW - Protein/Energy ratio

U2 - 10.1016/j.aquaculture.2017.12.035

DO - 10.1016/j.aquaculture.2017.12.035

M3 - Article

VL - 489

SP - 28

EP - 35

JO - Aquaculture

JF - Aquaculture

SN - 0044-8486

ER -