Contact: Robin Usborne
517-432-1555, ext. 169
ORGANIC APPLE ORCHARDS
Jim Koan, owner of AlMar Orchards in
“What the hogs do is interrupt that cycle,” he says. “If timed properly, they eat those dropped apples before the larvae have a chance to go into the soil and develop into adults.”
Koan brought three 150-pound
For three weeks during the "June drop" period, dropped apples were counted to quantify how many apples fall to the orchard floor. The pigs were rotated into the orchard to feed for two to three days and then removed. Again, apple counts were done to determine what the pigs left behind. Rarely were any dropped apples found.
“Eighty to 90 percent of their food was apples, supplemented with organic corn,” Koan says. “They loved the June drops, with the piglets liking them best. The hogs would lie around while the piglets would scurry from tree to tree as one group to feed.”
In comparison, the orchard areas where no hogs were grazed had five times the curculio damage as the grazed areas. In addition, Koan noticed the hogs’ rooting around the apple trees saved him from having to rototill around each tree to suppress weeds in the grazed organic orchard. The pigs will be grazed through the orchard once again this winter.
Dale Rozeboom, MSU animal scientist, monitored the orchard herd’s reproduction, health and nutrition for the project. One of the major challenges with a foraging diet of apples is getting enough protein.
“The pigs born last spring are not up to market weight yet, likely a result of plenty of exercise. Otherwise they seem to be very healthy,” Rozeboom says. “We’ve only observed light numbers of parasites in collected fecal samples.”
In a controlled experiment conducted at MSU, Rozeboom fed plum curculio larvae to 3-month-old pigs and collected and washed all feces to confirm that ingestion by pigs was lethal to the larvae. Of more than 250 larvae fed over a six-day period, no live plum curculio and only the remains of one dead larva were found.
“This was an encouraging first year for the project,” Epstein says. “One of the issues we want to look at further is the optimal number of pigs needed per acre to control plum curculio.”
As the project continues, Rozeboom will be looking at pork production-related factors, such as the type of supplements necessary for adequate weight gain and pork quality.
This research is funded through a grant by the U.S. Department of Agriculture
Integrated Organic Program. Epstein is also funded partially by Project GREEEN.
Founded in 1997, Project GREEEN (Generating Research and Extension to meet
Economic and Environmental Needs) is a cooperative effort between plant-based
commodities and businesses together with the Michigan Agricultural Experiment
Station, MSU Extension and the Michigan Department of Agriculture to advance
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