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]

*Day in milk