Feeding Value of Low Test Weight Corn for Pigs
Based on current knowledge, corn test weight does not significantly affect pig growth until it drops below 45 lbs/bu. As test weight declines below 45 lbs/bu, digestible energy decreases by 5-6 % and as a result, feed efficiency and growth rate will also suffer (3-10%) because of reduced energy intake. 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.
Feed companies adjust their product ingredient formulas to compensate in bad years when corn has a lower nutritive value. On farm feed mixers must adjust their own rations to compensate as well.
To deal with low test weight corn, producers should:
Table 1 provides an estimate of the weight of low grade corn needed to provide the same energy as 1 kg of 56 lbs/bu corn. These guidelines can be used to reformulate rations.
Source: OMAFRA. Based on analysis of corn samples from 1992 growing season.
Reformulate mix of 800 kg corn (56 lbs/bu) + 200 kg soybean meal (SBM) with 50 lbs/bu corn.
Calculate amount of corn needed to provide identical amount of energy: 800 kg x 1.026 = 820.8 kg .
Reformulate mix = 820.8 kg corn + 200 kg SBM = 1020.8 kg mix
On a 1000-kg basis, new mix would contain: 820.8/1020.8 x 1000 = 804 kg corn, and 200/1020.8 x 1000 = 196 kg SBM
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