Semen for Sale

The selection and sale of Guernsey bull semen is an important part of the Guernsey Society’s business and since 2000 has been based on the use of a specific Guernsey Merit Index (GMI). The GMI was developed by geneticist Dr John Woolliams in conjunction with a committee of Guernsey breeders who agreed on the priorities for breed improvement and within the Index the balance between Production and Type was set at approx 60-40 and GMI was the first UK index to give emphasis to Type Improvement (Legs/Feet and Mammary).

Semen available from

Trewey Valiant ( sexed)


Woodlands Cody ( sexed


Chiddingstone Leon ( sexed )


There is also a selection of conventional semen available . Please email –

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