Since 2001, Massey University has run a trial organic dairy farm beside a conventional dairy farm in the Manawatū. Each farm has an area of about 21 hectares and supports some 45 Holstein-Friesian cows. Their pastures are monitored twice a year for herbage production and species composition. Both are dominated by perennial ryegrass and white clover, and in the organic pasture, broad-leaved dock and bellis daisy are also common. Although less pasture and milk is produced on the organic farm, the high price paid for its milk makes it economic.