Page 41 - New additives and ingredients in the formulation of aquafeeds

Table 4. Two different application regimes evaluated for supplementing a
digestive aid to the feed of Pangasius catfish in two farm locations of Hung
Vuong Mien Tay breeding joint stock company in the Mekong Delta (van Halteren
et al., 2009)
Fish sizE (g) Feed specifications
(% crude protein) treatments
Control AQUAGEST 1 AQUAGEST 2
20-100 28 - AQUAGEST® OMF
1 kg/MT of feed
AQUAGEST® OMF
2 kg/MT of feed
100-200 28 - AQUAGEST® OMF
1 kg/MT of feed
AQUAGEST® OMF
2 kg/MT of feed
200-500 26 - - AQUAGEST® OMF
1 kg/MT of feed
> 500 22 - - -
Overall, the results obtained for FCR and individual daily growth rate
were excellent compared to the industry average in Vietnam (FCR: 1.6-1.8;
growth: 4-5 g/day). The results from both trial locations showed improved
growth and food conversion, and a shortening of the production cycle with
the application of the feed additive (Table 5). The improvement on growth
performancewasmodest for the lowest dosage applied only during the initial
period (treatment Aquagest 1). However, very significant improvements
were obtained for the second treatment (Aquagest 2) compared to the
control, including improvements of FCR by 3.3-3.2%, daily weight gain by
10.6-14.8% and a reduction of the culture duration by 5.2-16.4%. All farm
results showed better economics due to the application of the digestibility
enhancer. This was due to a combination of the improved feed cost per kg
of fish produced (0.2-0.7% for the lowest application regime and 1.4-2.4%
for the highest application regime) and the significant shortening of the
production cycle.
Table 5. Effect of two different application regimes of a digestibility enhancer on
duration of the production cycle, growth and FCR of Pangasius catfish in two trial
locations in Vietnam (van Halteren et al., 2009)
trial site 1: Tra Vinh
Treatments
(see Table 4)
Days of culture to
reach 850 g (days)
Individual fish
growth rate (g/day) FCR
Control 210 3.96 1.52
Aquagest 1 207 4.04 1.51
Aquagest 2 199 4.38 1.47
trial site 2: Sa Dec
Treatments
(see Table 4)
Days of culture to
reach 850 g (days)
Individual fish
growth rate (g/day) FCR
Control 171 4.53 1.55
Aquagest 1 171 4.40 1.53
Aquagest 2 143 5.20 1.50
Innovative approaches to reduce feed cost in aquaculture: optimizing nutrient utilization and gut health 39