Midcontinent Livestock Supplements, Inc (MLS) Equine Tubs Catalog Horse Midcontinent Livestock Supplements, Inc (MLS) Equine Tubs Manufacturer : Midcontinent Livestock Supplements Texas Description A forage supplement formulated for growing and mature horses, mules, and donkeys with all natural protein, and concentrated vitamin and trace minerals to supplement roughage feeding or grazing. To see the full product line, please check here. Rates Please contact us for current pricing and availability.