Daily digestible protein and energy requirements for growth and maintenance of sub-adult Pacific white shrimp (Litopenaeus vannamei)
This study utilized two diets (25 and 35% crude protein) fed at 10 different rates to produce differences in shrimp specific growth rate which were regressed against daily digestible protein (DP) and digestible energy (DE) intake to estimate daily DP and DE requirements for sub-adult L. vannamei. Ap...
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| Other Authors: | |
| Format: | Others |
| Language: | en_US |
| Published: |
2010
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| Online Access: | http://hdl.handle.net/1969.1/ETD-TAMU-1832 http://hdl.handle.net/1969.1/ETD-TAMU-1832 |
| Summary: | This study utilized two diets (25 and 35% crude protein) fed at 10 different rates
to produce differences in shrimp specific growth rate which were regressed against daily
digestible protein (DP) and digestible energy (DE) intake to estimate daily DP and DE
requirements for sub-adult L. vannamei. Apparent DP and DE requirement for
maximum growth decreased throughout the 7-week trial as shrimp size increased. Mean
apparent daily DP requirement for 7.69 to 13.08-g L. vannamei fed the 25% protein diet
was 6.31 g DP kg-1 BW d-1 while the 35% protein diet produced a mean apparent daily
DP requirement of 8.00 g DP kg-1 BW d-1 for 8.11- to 13.79-g L. vannamei.
Maintenance requirements were estimated by regressing DP feed allowances back to
zero weight-gain and were 1.03 g DP kg-1 BW d-1 for shrimp fed the 25% protein diet
and 1.87 g DP kg-1 BW d-1 for shrimp fed the 35% protein diet. Mean apparent daily DE
requirement for shrimp fed the 25% protein diet was 402.62 kJ DE kg-1 BW d-1 while the
35% protein diet produced an apparent daily DE requirement of 334.72 kJ DE kg-1 BW
d-1. Mean apparent daily DE maintenance requirements for shrimp fed the 25% protein diet was 66.23 kJ DE kg-1 BW d-1 while the requirement was 78.82 kJ DE kg-1 BW d-1
for shrimp fed the 35% protein diet. Daily DP and DE requirements were also
determined by regressing whole-body protein or energy change against daily DP and DE
intake and were similar to those values obtained by regressing change in body weight
against daily DP and DE intake. Another component of this project involved evaluating
32 different feedstuffs for dry matter, protein and energy digestibility coefficients. Fish
meal apparent crude protein digestibility coefficients as a group were higher than all
other ingredient classifications except purified ingredients. Protein in 48% soybean
meal and 90% isolated soybean protein were significantly more digestible than protein
found in fish, animal and marine meals tested. This data will improve the quality and
reduce the cost of commercial shrimp feeds. |
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