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Actually, straw lacks seeds because the seed has been harvested as grain. Straw is a byproduct of grain production (wheat, oats, rice, etc.). Hay is grown as a crop in itself and is either grass, legume, or clover, and CAN have seeds depending on what stage of growth it's harvested at. Seedy hay tends to have more tough stems and lower digestibility, but since the OP says this hay has very fine strands, it could possibly be that it contains a high percentage of late season clover, which doesn't "bulk up" before seeding and is often interplanted with coastal bermuda grass to boost protein levels. Coastal Bermuda also keeps a nice, small stem if it's irrigated well and regularly harvested, so if it's imported from an area that's escaped the drought, this is probably why it looks different than local hay. I'd check the hay for an excess of tough, multi-branched stems (not desirable) and for soft, semi-green stems (desirable). A good hay should have more of the second and little of the first. Also be sure you don't detect any musty odor or see an excess of dust when you open it. It takes very little mold to make a horse or a chicken very sick, and with the recent drought, some unscrupulous out of state sellers have been offloading some pretty crappy hay that I wouldn't use for compost, much less to feed my animals.