INFLUENCE OF OIL AND MINERAL SOURCE ON PERFORMANCE, FATTY ACID PROFILE AND MINERAL PROFILE IN RAINBOW TROUT Oncorhynchus mykiss

 
 Keith Filer
 Alltech, Inc
 3031 Catnip Hill Road
 Nicholasville, KY 40356
 kfiler@alltech.com

An 8 week feeding trial was conducted to evaluate the impact of oil source and mineral source on weight gain, whole body fatty acid profile and whole body mineral analysis of Rainbow trout. Eight isonitrogenous and isoenergetic diets contained soy bean oil and either fish oil or All-G-Rich® as an oil source and inorganic or Bioplex® minerals at a 100, 75 or 50% of recommended NRC levels. The oil source had no impact on weight gain (p>0.05). In this study, the fish that were fed the diet containing 100% inorganic minerals had the lowest weight gain compared to the fish fed any level of Bioplex minerals. The fish fed diets containing All-G-Rich had a higher level of omega 3 fatty acid (p<0.05) and DHA (p<0.05) in the whole body and the omega 6 fatty acid whole body profile was not changed by oil or mineral source. The fish fed the fish oil diet had higher levels of whole-body zinc and selenium compared to fish fed the All-G-Rich diets (p<0.05).  The fish fed the 50% Bioplex mineral diet had a lower selenium level compared to other diets (P<0.05). The growth data from this study indicate that Bioplex minerals can be provided at 50% of the NRC required level and maintain growth.  The use of Bioplex minerals at all levels resulted in greater DHA uptake.