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Any of a breed of beige-colored sheep developed in the United States, raised for meat and wool and valued for their hardiness and frequent lambing.

[poly- (from its having been bred from multiple breeds) + pay (from its good return on investment).]
References in periodicals archive ?
About 130 Suffolk and Polypay ewes were expected to give birth this season.
07 in Polypay (Notter, 1997) and Elsenburg Dormer (Van Wyk et al.
Croix and Polypay ewes - the latter another composite U.
The OSU barn is part of research in breeding Polypay sheep, which are known for having larger birth numbers, with Suffolk sheep, which tend to have just one lamb per pregnancy.