3.3. Effect of dietary oils on the fatty acid composition of pork LD muscle
The fatty acid composition of LD muscle was found to be affected by
the dietary oils, as differences in the fatty acid compositions were
observed, reflecting the different dietary oils (Table 1). Because of its
supplementation with sunflower oil that is rich in linoleic acid, the
CONT-S group had a higher (P ≤ 0.05) proportion of linoleic acid and,
therefore, a higher (P ≤ 0.05) proportion of total n-6 fatty acids
compared with the CONT-L group. Substitution of sunflower oil by
linseed oil resulted in decreased (P ≤ 0.05) total n-6 fatty acid proportions
and a concomitant increase (P ≤ 0.05) of total n-3 fatty acid
proportions. The increase of total n-3 fatty acid proportions in the
CONT-L groupwas due to a rise (P≤ 0.05) in porkmuscle of the proportions
of α-linolenic acid, EPA and DPA but not of DHA. As a consequence
of these changes, the proportion of SFAs increased (P ≤ 0.05) and the
proportion of MUFAs decreased (P ≤ 0.05), whereas the proportion of
PUFAs remained unchanged (P N 0.05). These results are in agreement
with several other short- and long-term feeding trials with linseed oil
that have failed to increase tissue DHA levels (Ahn, Lutz, & Sim, 1996).
The reason for this low deposition is unclear since significant increases
in tissue DHA after feeding linseed oil have also been reported (Enser,
Richardson,Wood, Gill, & Sheard, 2000).
3.3. Effect of dietary oils on the fatty acid composition of pork LD muscle
The fatty acid composition of LD muscle was found to be affected by
the dietary oils, as differences in the fatty acid compositions were
observed, reflecting the different dietary oils (Table 1). Because of its
supplementation with sunflower oil that is rich in linoleic acid, the
CONT-S group had a higher (P ≤ 0.05) proportion of linoleic acid and,
therefore, a higher (P ≤ 0.05) proportion of total n-6 fatty acids
compared with the CONT-L group. Substitution of sunflower oil by
linseed oil resulted in decreased (P ≤ 0.05) total n-6 fatty acid proportions
and a concomitant increase (P ≤ 0.05) of total n-3 fatty acid
proportions. The increase of total n-3 fatty acid proportions in the
CONT-L groupwas due to a rise (P≤ 0.05) in porkmuscle of the proportions
of α-linolenic acid, EPA and DPA but not of DHA. As a consequence
of these changes, the proportion of SFAs increased (P ≤ 0.05) and the
proportion of MUFAs decreased (P ≤ 0.05), whereas the proportion of
PUFAs remained unchanged (P N 0.05). These results are in agreement
with several other short- and long-term feeding trials with linseed oil
that have failed to increase tissue DHA levels (Ahn, Lutz, & Sim, 1996).
The reason for this low deposition is unclear since significant increases
in tissue DHA after feeding linseed oil have also been reported (Enser,
Richardson,Wood, Gill, & Sheard, 2000).
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