The conservation of genomes can be achieved either by storing semen, embryos, cells, nuclei, or oocytes. Establishment of gene or cDNA libraries would be an appropriate means of gene conservation. Cryoconservation of cells or tissues obtained from animals would be a rather cheap alternative. If it were carried out now this would allow the establishment of gene libraries to be screened for the desired gene(s) at later times. Full reactivation of breeds can only be achieved by means of conserving the entire genome. If individual genes or gene clusters are required in the future the conservation of cell material containing the nuclei would be entirely sufficient
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 475–479, 1990
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