Dealing With Low Test Weight Corn

The growing seasons of 1992 and (to a lesser extent) 2000 resulted in low test weight corn at harvest. Some producers will also be dealing with low test weight corn from the harvest of 2003.

Previous research trials have indicated that lower test weight corn had significant energy content and relatively little additional corn was required to arrive at feeding values equivalent to normal test weight corn (see Table 1). Using these values, dockage for low test weight corn can be calculated. The resulting potential dockage is generally lower than traditional discounts applied to low test weight corn (Table 2). These adjusted values should be considered when feeding or seeking to set a fair value on low test weight corn.

Source: Gwen McBride, OMAFRA. (Based on analysis of corn samples from 1992 growing season.)

Generally, corn test weight does not significantly affect pig growth until it drops below 45 lbs/bu. Research has shown that adding 2 - 3% oil or fat to diets made with very low test weight corn (below 45 lbs/bu) will help improve performance. But it will not return it to the level achieved with normal test weight corn (56 lbs/bu).

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