Dust suppression in swine feed using soybean oil.
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 .99 mg/m3, respectively) (P < .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 < .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 < .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 < .001). There was no evidence of any storage time or treatment x storage time interactions.
Mankell
K O
KO
Department of Agricultural Engineering University of Minnesota, St. Paul 55108, USA.
Janni
K A
KA
Walker
R D
RD
Wilson
M E
ME
Pettigrew
J E
JE
Jacobson
L D
LD
Wilcke
W F
WF
D000821:Animal Feed / Q000032:analysis / Q000592:standards*; D000818:Animals; D004391:Dust; D005524:Food Technology / Q000379:methods; D013024:Soybean Oil / Q000032:analysis / Q000592:standards*; D013025:Glycine max / Q000592:standards; D013552:Swine / Q000502:physiology*; D013997:Time Factors; D003313:Zea mays / Q000592:standards
D004391:Dust; D013024:Soybean Oil