Dust suppression in swine feed using soybean oil.
Mankell K.O. | Janni K.A. | Walker R.D. | Wilson M.E. | Pettigrew J.E. | Jacobson L.D. | Wilcke W.F.
Dust generation from swine feed (corn-soybean meal diet) treated with soybean oil was investigated using a cement mixer in a plywood box. Airborne total dust concentrations in the box were measured gravimetrically using a vacuum pump and filters while 12-kg feed samples were constantly mixed. The treatment factors were soybean oil concentration (0, 1, and 3%), corn bulk density (normal, 730 kg/m3 and low, 600 kg/m3), time of oil addition (before vs after grinding the corn), and storage time (0, 7, and 14 d). The feed was a mixture of soybean meal, base mix, and adjusted amounts of ground corn and soybean oil. Adding soybean oil after grinding at 1 and 3% levels to feed made with normal-bulk density corn suppressed total dust generation (3.39 and.0.99 mg/m3, respectively) (P < 0.001) compared with the no oil treatment (29.1 mg/m3). The 3% soybean oil treatment suppressed dust generation (.99 mg/m3) more than the 1% soybean oil treatment (3.39 mg/m3) (P < 0.001). Adding soybean oil after grinding the corn suppressed dust generation more than adding the oil to the corn before grinding for every oil level (P < 0.001). More dust was generated by feed made from low-bulk density corn than by feed made with normal-bulk density corn at every oil level (P < 0.001). There was no evidence of any storage time or treatment X storage time interactions.
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