A nearby view of the barn and feedlot for the organic cows at the Shamrock factory dairy. The organic cow barn, feedlot and lagoon at the Shamrock factory dairy near Phoenix. Another image of the feedlot, barn and lagoon. Calf housing at the Shamrock operation. Conventionally managed cows are also milked at the Shamrock 11,000-head factory dairy. Very limited irrigated pasture for organic dairy cows. Organic regulations require pasturing of dairy cows, mighty difficult on this unirrigated land at the Shamrock facility. Greener grass found on this irrigated golf course near the Shamrock factory dairy.