The Landrace and the Large White are, today, the dominant breed of pig in commercial production in Ireland.
If you were buying old men, then Datt would have come in a box marked White, Large and Bald.
In appearance it looks like a smaller version of the Large White (Pieris brassicae).
Unlike the Large White, they are not distasteful to predators like birds.
The Large White is a strong flier and the British population is reinforced in most years by migrations from the continent.
The Large White is one of the most numerous of all pig breeds, widely used in crossbreeding for intensive pig farming around the world.
The Large White has proved itself as a rugged and hardy breed that can withstand variations in climate and other environmental factors.
In the first three years of that decade more than 8,500 pedigree Large Whites were exported to all parts of the world.
For rapid growth and profitability his preferred breed was the Large White, but he was "far from decrying the Berkshires".
It's probably the one called Planetless Very Large White Very Hot Star.