Table 3 Effect of dietary polyunsaturated fatty acids on oxytocin-stimulated prostaglandin F_2α metabolite (PGFM) in dairy cows

Animals

Treatments

Oxytocin

Results

Ref.

Holstein 116 DIM* Day 15 of synchronized oestrous cycle

1) 2.6% fish meal (FM)

2) 5.2% FM

3) 7.8% FM

4) Corn silage, corn grain, soybean meal

100 IU

PGFM response lower in cows fed FM

[369]

Holstein 25 DIM Day 15 of synchronized oestrous cycle

Maize silage, alfalfa, maize supplemented with:

1) Extruded linseed (5.5%)

2) Extruded soybean (4.9%)

100 IU

PGFM not significantly lower at base line with linseed. PGFM response was not different between treatments.

[370]

Holstein 38 DIM Day 14 of synchronized oestrous cycle

Grass and maize silage, barley supplemented with:

1) Flaxseed (4%)

2) Megalac (4%)

3) Sunflower seeds (4%)

20 IU

PGFM response higher with sunflower seeds and lower with flaxseed

[371]

Breed not described 38 DIM Day 14 of synchronized oestrous cycle

1) Corn silage, alfalfa hay, ground corn, soybean meal supplemented with:

2) 1.25% fish meal (FM)

3) 2.5% FM

4) 5.0% FM

5) 2.3% Ca salts of fish oil fatty acids

100 IU

PGFM response was not different between treatments.

[372]

Holstein 63 DIM Day 15 of synchronized oestrous cycle

Grass + maize silage, barley supplemented with:

1) Flaxseed (10%)

2) Megalac (4%)

3) Micronized soybeans (17%)

100 IU

PGFM response was not different between treatments.

[373]