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Bull fertility (AI) survey

Bull fertility (AI) survey

Ark 12(12): 415-416

In a survey carried out in 1985 by the Rare Breeds Survival Trust, UK, the number of pregnancies achieved per semen dose averaged 0.33 for British White (BW), 0.44 for White Park, 0.43 for Shetland, 0.33 for Northern Dairy Shorthorn, and 0.23 for Gloucester semen used in purebreeding. Corresponding figures for BW, Shetland and Gloucester semen used in crossbreeding were 1.00, 1.00 and 0.83 resp.

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