ClpClop -- two different types of hay will be just fine. I mix my own hay just as you do, primarily because it is very difficult to get good bales of mixed hay in Florida. Part of the reason is because alfalfa, a legume and not a grass at all, grows at a quicker rate than the grasses it is frequently cultivated with. As such, when the Timothy (or orchard grass, or brome, etc) is at the right stage for cutting, the alfalfa is over-mature. If the alfalfa is at the perfect stage for cutting, the grass may not be at optimum growth stage. I solve that problem by purchasing alfalfa bales trucked in from up north and a locally grown Tifton (bahia hybrid), then mix them according to each individual horse's needs. Fatties get mostly grass hay with a "whiff" of alfalfa while moms and foals get about 50:50.
As far as Bermuda or Bahia or Coastal hays causing colic, that probably has more to do with the physical hay itself rather than the "type" of hay. I've heard nearly as many people claim their horses have colicked on alfalfa! Very fine hay of any type (and it is true that the warm-climate grasses like Bermuda and Bahia tend to be finer than the cold climate grasses like orchard or timothy) may ball up in the cecum and cause impaction colics. On the other hand, there are many references to coarse-stemmed hays such as overmature Timothy or oat hay causing colics due to perforation, etc. Rule of thumb regarding hay is to purchase the best you can find and afford, regardless of "species". It should be soft and springy, fresh-smelling and free of dust, mold or debris. Extremely dense flakes that are hard to pull apart and overly heavy bales may have been baled too early, contain too much moisture, and be prone to mold. Hay that sits in poor storage too long may lose its nutrients. Learn about cuttings - 1st, 2nd, 3rd and beyond. This will help you choose hay that both keeps its nutritional value, AND is palatable and useful to your horse. Let your nose and fingers be your guide. If it smells sweet and fresh enough for YOU to eat, and soft and comfortable to your fingers, it's probably a good choice for your horse, too!
Robin C
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