Cryo-conservation schemes Operation of conservation schemes

Utilisation and conservation of farm animal genetic resources 191

Chapter 8. Operation of conservation schemes

3. Start breeding from the founder population using minimum kinship selection paragraph 2.2 and store semen from the sires. Note that within the minimum kinship selection procedure also the ‘stored’ males are selection candidates, i.e., even dead males can be selected because their semen is stored. Again, as soon as the population is ’23 years’ old the original semen cryo aided scheme can be run, where ‘23 years’ will be much shorter in most practical situations. It is not useful to keep on running the minimum kinship selection scheme, because it will try to prevent all genetic drit and thus evolution when the frozen ancestors become more and more old. Because of the high tech selection involved in method 3, the methods 1 or 2 may be more practical. However, methods 1 and 2 require more resources in terms of embryos or founder animals, which can be more costly than the high tech selection method 3. 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