Horse  Nutrition From Ohio State University Bulletin 762-00 Forage Species for Pastures and Hay Grass Selection Kentucky bluegrass is a shallow-rooted cool-season perennial grass that has commonly been used for pasture for horses. Bluegrass is primarily productive during late spring—early summer and during the fall. It is less productive than other cool-season grasses, but is easy to establish and manage. Tall fescue is a vigorous-growing, sod-forming cool-season grass that can withstand much trampling. It is suggested  for paddocks and areas of surface abuse. This species will retain its leaves into cold weather and will extend the pasture season in Ohio into early spring and early winter. When this species is used, plant only endophyte-free seed to  prevent the problems of decreased milk production, decreased growth, and possibly placenta abnormalities found with endophyte-infected fescue. Orchardgrass is an early, tall-growing,  high-yielding perennial bunchgrass that makes more summer growth than the other  grasses grown in Ohio. Orchardgrass must be heavily grazed or harvested as hay  in May. It requires close management for maintenance, as it cannot stand trampling or continual close grazing. Timothy is a late-maturing and tall-growing bunchgrass that is not recommended for pastures because it cannot take continual close grazing and produces only in late spring. It is more commonly used as a hay crop, usually in conjunction with red clover or alfalfa. Perennial ryegrass is included in a lot of pasture mixes because of its quick growth and ease of establishment. However, it  can have a mold that grows near the base of the plant and produces toxins that  may cause blind staggers in horses if the pasture is overgrazed. Horses will usually recover if removed from the pasture. Guidelines for selected crops rotational feeding start grazing (in) stop grazing (in) typical days rest Alfalfa (hay varieties) 10-16 3-4 35-40 Alfalfa (grazing varieties) 10-16 2-3 15-30 Bahiagrass 6-10 1-2 10-20 Bermudagrass 4-8 1-2 7-15 Big bluestem 15-20 10-12 30-45 Caucasian Bluestem 10-20 4-6 14-21 Clover, white and  subterranean 6-8 1-3 7-15 Clovers, all others 8-10 3-5 10-20 Dallisgrass 6-8 3-4 7-15 Eastern gamagrass 18-22 10-12 30-45 Fescue, Tall 4-8 2-3 15-30 Indiangrass 12-16 6-10 30-40 Johnsongrass 16-20 8-12 30-40 Kentucky Bluegrass 8-10 1-3 7-15 Orchardgrass 8-12 3-6 15-30 Pearl millet 20-24 8-12 10-20 Annual Ryegrass 6-12 3-4 7-15 Sericea lespedeza 8-15 4-6 20-30 Small grains 8-12 4 7-15 Smooth bromegrass 8-12 3-4 20-30 Sorghum, forage 20-24 8-12 10-20 Sorghum/sudan hybrids 20-24 8-12 10-20 Switchgrass 18-22 8-12 30-45