Pasture is the best way to get omega 3 into your horse. You want them to consume the AL and ALA forms as they are vegetarians. Besides pasture, flax(linseed) or chia are good sources as opposed to DHA and EPA forms (fish, krill or algae) which are animal based. Pastures are highest during active growth (spring and summer) when not stressed (drought, excessive heat, cold). O3 levels decline rapidly in hays. O6 is a necessary part of the diet but not in such great quantities. Grasses (green and growing) have a ratio of 3 to 6 of 4:1.