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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 ?
The Polypay, Icelandic, Dorset and the Finnish Landrace are other breeds occasionally seen on dairy sheep breed lists.
Notter, genetic parameters for growth traits in Suffolk and Polypay sheep, Livest.
Genetic parameters among weight, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep.
Estimates of gen etic param eters and gen etic trend for reproduction weight and wool characteristics of Polypay Sheep.
Effects of ewe age and season of lambing on prolificacy in US Targhee, Suffolk and Polypay sheep.
Relation of Age, Body Weight and Morphometric Measures on the Onset of Puberty in Polypay Lambs of the Potosino Highlands
About 130 Suffolk and Polypay ewes were expected to give birth this season.
22) encontraram diferenca entre as racas Rambouillet, Targhee, Columbia e Polypay para a quantidade de gordura, proteina e umidade.
07 in Polypay (Notter, 1997) and Elsenburg Dormer (Van Wyk et al.
En relacion a la asociacion de la emergencia de la onda folicular y las oscilaciones de FSH durante el ciclo estral (dia cero = ovulacion) en ovejas Polypay, se describio un aumento en las concentraciones plasmaticas de FSH de 2 a 3 dias antes de la emergencia de la onda folicular, a traves del intervalo interovulatorio, presentandose dos eventos aproximadamente cada 4 dias (30).
For example, you might want to use an Oxford ram for muscling, Polypay ewes for multiple births, then cross their lambs with Romney to add length and luster to the fleece.