BUSINESSPhotos: Wisconsin organic dairy farms competing with mega-size farmsLynn Thull feeds calves on her family's farm near Kewaskum. Thull's father-in-law converted from conventional farming to organic about 50 years ago. Some organic dairy farmers are struggling in a marketplace flooded with organic milk, much of it from mega-size farms in Texas.Mark Hoffman / Milwaukee Journal SentinelKevin Thull does his morning milking on his family's farm near Kewaskum. Thull's father converted from conventional farming to organic about 50 years ago.Mark Hoffman / Milwaukee Journal SentinelDairy cattle eat on Kevin and Lynn Thull's farm near Kewaskum.Mark Hoffman / Milwaukee Journal SentinelA sign alerts visitors that Kevin and Lynn Thull's farm is organic.Mark Hoffman / Milwaukee Journal SentinelA barn cat wanders around while Linda Thull feeds calves on her family's farm near Kewaskum.Mark Hoffman / Milwaukee Journal SentinelA sign greets visitors on the barn owned by Kevin Thull on his family's farm near Kewaskum.Mark Hoffman / Milwaukee Journal SentinelCalves guzzle milk on Kevin and Linda Thull's farm near Kewaskum.Mark Hoffman / Milwaukee Journal SentinelLynn Thull does chores on her family's farm near Kewaskum.Mark Hoffman / Milwaukee Journal SentinelDairy cows enter the milking parlor for their morning milking on the Thulls' farm.Mark Hoffman / Milwaukee Journal SentinelOrganic milk is stocked Festival Foods in Fond du Lac. Some organic dairy farmers are struggling in a marketplace flooded with organic milk, much of it from mega-size farms in Texas and Colorado.Mark Hoffman / Milwaukee Journal Sentinel