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GRAZING COVER CROPS AS AN ALTERNATIVE TO FALLOW AND THE INTERACTION BETWEEN CORN PROCESSING METHOD AND CONDENSED DISTILLERS SOLUBLES

A 2-year grazing study was conducted to evaluate forage quality and utilization of cover crops (CC) planted to replace fallow in no-till wheat systems compared to crested wheatgrass pastures (CWP). The CC mixture consisted of oats, peas and turnips with seeding rates of 44.7, 44.7, and 2.2 kg/hectare, respectively. Planting occurred in March with a no-till drill both years for the CC and both treatments (CC and CWP) were grazed during the month of June. For both years, total tract dry matter digestibility (TTDMD) and CP were greater (P ≤ 0.05) for CC compared to CWP in hand clipped samples. The NDF and ADF content of CC were less (P ≤ 0.08) than CWP for both years. The TTDMD and CP of the diet samples were greater (P ≤ 0.04) for CC compared to CWP in both years. The NDF and ADF content of the diet samples were less (P ≤ 0.02) in CC compared to CWP. In 2012, NDF digestibility and UIP content was similar (P ≥ 0.25) between CC and CWP. Initial and final biomass was less (P ≤ 0.04) for CC compared to CWP in 2011. In 2011, forage utilization was similar (P = 0.40) between CC and CWP. In 2012, initial and final biomass were similar (P ≥ 0.50) for CC compared to CWP. Forage utilization in 2012 was similar (P = 0.14) between CC and CWP. CC were observed to have greater forage quality over both years and may produce similar amounts of forage as crested wheatgrass pastures. Calculations on an animal unit month (AUM) basis suggest cover crops may provide 1.54 AUM/ha of available forage.