GL says the sheep are Merinos in Castle Valley and there is a little creek also called Castle. Here's a little more action in the video [ youtube video ]

The Merino is a breed or group of breeds of domestic sheep, characterised by very fine soft wool. It was established in Spain near the end of the Middle Ages, and was for several centuries kept as a strict Spanish monopoly; exports of the breed were not allowed, and those who tried risked the death penalt