Grazing Advice

We want to reclaim a former gravel pit using warm season grasses, and use it for grazing beef cattle once it is established. The area is 4.5 acres, steep sloping walls with a flat bottom. Soils are excessively drained loamy sands. Thanks!
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I would suggest a blend of Switchgrass at 4 pure live seed lbs./ac, Big Bluestem at 4 pls/ac, Little Bluestem at 2 pls/ac, and Sand Lovegrass at 1.5 pls/ac. This is a warm season mix that has been used for revegetating sand and gravel mines in the Northeast.

Our Warm-Season Pasture Mix may be a viable option as well.

We have planted Sudan grass on our 20 acres and harvested it, but we would like to turn our horses and beef cows out to graze it for the winter, it this ok?
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It is not recommended. The biggest concern being the prussic acid content.

The new growth areas of Sudan grass may contain a toxic level of prussic acid. A sample should be taken to a local testing office and have it tested prior to grazing. Make sure to take multiple samples from various parts of the entire feild. If it tests come back okay, then it may potentially be safe to graze. 

Typically, one should wait until the Sudan grass is at least 12 inches tall (18+ is ideal) before grazing cattle or horses.