Conclusions
Feeding extruded linseed did not modify dry matter
intake or milk yield but reduced yields of fat and fatcorrected
milk, milk fat content, and increased milk
protein content. Supplementing diets with extruded
linseed reduced short and medium chain fatty acids, and
increased long, monounsaturated and polyunsaturated
fatty acid concentrations in milk fat. It also increased n-
3, trans-11 C18:1 and total CLA concentrations, and
reduced the n-6 to n-3 fatty acid ratio. This fatty acid
profile of milk fat may be beneficial for human health.
The basal concentration of PGFM and the uterine
release in response to an oxytocin challenge tended to be
lower in cows fed linseed, supporting the hypothesis
that increasing the n-3 FA in the diet decreases the
synthesis of uterine PGF2α. Although a reduction in
PGF2α was expected to improve conception rate in LIN
cows, reproductive performance was not modified.
Conclusions
Feeding extruded linseed did not modify dry matter
intake or milk yield but reduced yields of fat and fatcorrected
milk, milk fat content, and increased milk
protein content. Supplementing diets with extruded
linseed reduced short and medium chain fatty acids, and
increased long, monounsaturated and polyunsaturated
fatty acid concentrations in milk fat. It also increased n-
3, trans-11 C18:1 and total CLA concentrations, and
reduced the n-6 to n-3 fatty acid ratio. This fatty acid
profile of milk fat may be beneficial for human health.
The basal concentration of PGFM and the uterine
release in response to an oxytocin challenge tended to be
lower in cows fed linseed, supporting the hypothesis
that increasing the n-3 FA in the diet decreases the
synthesis of uterine PGF2α. Although a reduction in
PGF2α was expected to improve conception rate in LIN
cows, reproductive performance was not modified.
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