Just a note, hay quality plays a role. There are nutritional differences between different types of hay[grass,timothy,alfalfa...] when it was cut/baled[spring,summer,fall also know as 1st,2nd,3rd cut] At its growth stage[right before/at maturity very nutritional,already bloomed not as rich] and storage age, if its been sitting in a barn for 6mnths to a year it has lost some nutritional value. Color isn't always a factor alfalfa turns very yellow on the outside but can still be very high in nutr. Very green grass hay is not as nutr. packed as your legumes. Look for nice color good leafy consistancey, stem should not be to thick, no foreign matter[sticks,leaves,dirt] and it should have a good smell.