The effects of different dietary lipids on the growth, nutrition
and tissue lipid profiles of rainbow trout raised to market size on a
commercially available ration were examined. Rainbow trout of 80 g
mean initial weight were fed pellets prepared according to Oregon
Moist Pellet specifications for 20 weeks. Salmon oil (0MP-1),
soybean oil (OMP-2), linseed oil (OMP-3), chicken fat (OMP-4), pork
lard (OMP-5) and beef tallow (OMP-6) were used for the 6% lipid
component of the diets. No differences in feed conversion or growth
rate were observed across diet groups.
Trout nutrition was monitored by three blood parameters -- red
blood cell (RBC) fragility (hemolysis), packed cell volume (PCV)
(hematocrit), and percent hemoglobin. The OMP-1 diet appeared to
have caused oxidative stress in trout as measured by hemolysis, while
hematocrit and percent hemoglobin values were uniform across diet
groups.
Tissue levels of total n-3 fatty acids were highest in the OMP-3
group and decreased in the order OMP-1 > OMP-2 = OMP-4 = OMP-5 =
OMP-6. However, unaltered linolenic acid (18:3 n-3) comprised almost
50% of the n-3 fatty acid content of OMP-3 trout tissue lipid. The
level of total 20:5 n-3 plus 22:6 n-3 (18%), was 33% higher in tissue
from OMP-1 trout than tissue from all other diet groups which held
fairly constant at 12% across OMP groups 3-6. The lowest tissue
level of total 20:5 n-3 plus 22:6 n-3 was found in the OMP-2 trout,
10%.
Trout raised on the OMP-1 diet also retained higher tissue stores
of 20 and 22 carbon monoenes than trout fed OMP diets 2-6, but less
than dietary levels. In contrast, trout fed OMP diets 2-6 retained
higher tissue levels of these same fatty acids than dietary levels.
The diet ratio of polyunsaturated fatty acids (PUFA)/22:1 appeared to
influence whether 22:1 was conserved or oxidized.
The most favorable balance of trout tissue monoenes, n-6 fatty
acids and total 20:5 n-3 plus 22:6 n-6 for human health was found in
trout fed the OMP-6 diet. / Graduation date: 1988
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27145 |
| Date | 31 August 1987 |
| Creators | Greene, Diana H. |
| Contributors | Selivonchick, D. P. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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