Abstract
It is necessary to keep diversity in livestock as well as in wild life. Decreased variety in wild life leads to extinction of species whereas in the aspect of livestock it may lead to hunger. This can be because of inbreeding depression or lost genes that are still needed. Different lines of livestock should be kept to prepare for a future that requires attributes not needed today. The different lines can be determined using factor analysis. Separate lines then can be merged by random mating; making way to a herd that has the variance of the original herd. Alternatively, biological material can be stored cryogenically. Live animals can adapt to environmental changes in time and may prove more useful though keeping live animals may cost more than cryogenic storage of biological material. Keywords. cryogenic storage, livestock, biotecnology, biodiversity, sperm, oocites
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