New Delhi, Aug. 16 -- The Morrison family operates a dairy operation near Woodslee, Ont., and has been expanding the operation as quickly as quota allows. | Vicky Morrison photo Ontario farmers say they are having a hard time finding extra quota to accommodate the ups and downs of butterfat production

Dairy farmers in Canada who wish to expand are finding it tough to find extra butterfat quota.

William and Vicky Morrison with their son Scott, 15, and daughter Jane, 11, milk 180 cows on their farm just outside Woodslee, Ont.

With a milk price averaging 75 cents per litre, dairy farming is paying the bills for the Morrisons but expansion is difficult under the supply managed system.

"We moved to this farm in October 2013 after buying it ...