There are seven endangered pig breeds in Britain being conserved by a semen freezing programme financed by the Rare Breeds Survival Trust. To date, 22 boars have been frozen with satisfactory semen parameters. Where- ever possible fresh semen is also made available to breeders and data from 14 boars suggest similar semen parameters to the main white breeds. However significant numbers of rare breed boars show low libido. On average. Prostaglandin F2«C is used twice as often in rare breeds. On limited observations, the Berkshire and Large Black breeds appear most affected
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 480–483, 1990
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