REPLACEMENT OF FISH MEAL BY A
DEPHYTINIZED CANOLA PROTEIN CONCENTRATE IN COMMERCIAL DIETS FED TO RAINBOW
TROUT (Oncorhynchus mykiss)
D.D. Maenz, D.L. Thiessen, R.W. Newkirk, H.L.
Classen, M.D. Drew
A novel canola protein
concentrate (CPC) was supplied by MCN BioProducts Inc. (Saskatoon,
SK, Canada). The product contained 72.5% crude protein, with no detectable phytic
acid. Performance of rainbow trout was determined with CPC replacing graded
levels of fish meal in commercial-type diets. All the diets
contained 17% corn gluten meal, 10% soybean meal and were balanced
for crude protein, energy and lysine. The control diet contained
40% fish meal (S.A. prime) and the test
diets contained CPC replacing 38% and 76%
of fish meal protein in the control diet. No trends or differences in feed
intake were obtained at any time
during the trial. After 12 weeks of feeding, weights gain of fish were 94% of controls for the lower CPC diet and 89% of controls on the higher
CPC diet, however, these trends
were not statistically significant. After 12 weeks of feeding, feed
conversion rates were
statistically lower (P<0.05) for the control group (0.96) when compared
to the low CPC group (1.05) and the high CPC group (1.07). The
data demonstrates that dephytinized canola protein
concentrate can replace substantial levels of fish meal in a commercial type
of diet for rainbow trout with
marginal effects on performance.
(Department of Animal and
Poultry Science, University of Saskatchewan, 6D34 Agriculture Building,
51 Campus Dr., Saskatoon, SK, Canada, S7N 5A8 maenz@sask.usask.ca)