carpet blends. References Further reading V. R. Clark (1994). Evolution and establishment of the Coopworth breed 1950–1991. In: George H. Davis (editor) (1994). Lab Coats to Gumboots. New Zealand Society of Animal Production, Occasional Publication No. 13. 1994: 107–133. George H. Davis, Ken G. Dodds, Roger Wheeler, Nigel P. Jay (2001). Evidence That an Imprinted Gene on the X Chromosome Increases Ovulation Rate in Sheep. Biology of Reproduction. 64 (1): 216–221. . Sheep breeds originating in New Zealand Sheep breeds