Sunday, 15 July 2018
New research confirms the common house fly spreads serious hog diseases. Is Manitoba's factory hog industry dragging its heels?
by Larry Powell
The house fly. Photo by USDA
Not only were they carrying live viruses for both diseases, they were spreading them to healthy pigs and making them sick. What's more, the flies were even found to be infectious in January, usually considered the off-season for such harmful vectors.
Dr. Allison recommends putting a larvicide in the hog feed as one tool in a program to achieve effective fly-control. He believes an extensive program of spraying or fogging would pose too many dangers to the health and safety of workers.
What he does not mention is using anaerobic digesters (ADs) as a possible means of tackling this very problem. These complex pollution control devices use microbes in the absence of oxygen to break down pathogens in slurry, the liquid waste of hogs. The U.S. Environmental Protection Agency confirms that, not only do ADs drastically reduce offensive slurry odour (making slurry less of an attractant), they "lower pesticide expenses because of reduced fly hatching."
Trouble is, at the behest of the hog industry that ADs are too expensive, the Manitoba Government last year removed a requirement that they be built along with any new barns. As a result, there is said to be not a single AD in operation anywhere in the province. And it's not believed there are any plans for any in the future, either.
Meanwhile, PEDv has ravaged Manitoba's hog population since a serious outbreak began over a year ago. While mortalities, especially among piglets, were obviously high, the industry won't give numbers. And the province says it doesn't know, because it doesn't keep track.
The U.S. study was published in "Farm Journal's Pork" earlier this year.
Please also read: "In Hogs We Trust, Part 111"
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