Which preposition to use with southdowns

for Occurrences 1%

"Yes; I keep those few Southdowns for their fine quality.

in Occurrences 1%

On this occasion the Duke of Richmond, an hereditary and eminent breeder of Southdowns in their native county, bid a hundred guineas for a ram lamb, which Mr. Webb himself bought in.

than Occurrences 1%

The results obtained from these operations convinced his son that more mutton and better wool could be made per acre from the Southdown than from any other breed, upon nine-tenths of the arable land of England, where the sheep are regularly folded, especially where the land is poor.

Which preposition to use with  southdowns