Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 28-35 |
| Journal | Aquaculture |
| Volume | 489 |
| DOIs | |
| Publication status | Published - 20 Mar 2018 |
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Keywords
- Digestible energy
- Digestible protein
- Energy utilization
- Feed evaluation
- Protein efficiency
- Protein/Energy ratio
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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 journal › Article › Academic › peer-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 -