This image shows a cowboy posing before a significant herd of cattle, with more likely out of the frame on either side. Such herds are still common, though often dispersed much of the year during grazing season.
The description states:
A217 – WHITE FACED HEREFORDS
Cattle in the Western sense of the word, under the watchful eye of the ranch hand. Great hearts such as these need vast areas on which to graze. Photograph, Western Ways by R. J. M.
–Just behind the horses head is a windpump and a water tank, providing a clear reason why the cattle would be located here, close to water. This postcard likely dates from the 1950s.