Effect on metabolism in salmonids
Fat digestion, transport and metabolism were elucidated in growth and isotope studies with Atlantic salmon and rainbow trout. The effects of feed ration and oil processing were minor.
Despite the fact that the effects of feed ration and oil
processing were minor, the combination of vegetable protein and oil
sources had significant effects on growth, nutrient digestion and
retention, intestinal enzymes and bile salt. A fatty acid tracer
study revealed that the pyloric caeca was the most important site
for absorption of both medium chain and long chain fatty acids in
the gastrointestinal tract.
A peruvian fish oil was refined, winterised
(settling), randomised or added medium chain triglycerides or
taurine. The processing of the oil had minor effects on growth,
nutrient retention, blood glucose and insulin, intestinal
proteolytic and lipolytic enzymes and bile salt concentration. The
winterised oil lowered the blood cholesterol and had a positive
effect on the digestibility of fat and energy.