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Genetic and economic aspects of the maintenance of genetic diversity of cattle in situ, ex situ and in combination



Genetic and economic aspects of the maintenance of genetic diversity of cattle in situ, ex situ and in combination



Erhaltung genetischer Vielfalt in situ, ex situ und in Kombination beim Rind unter genetischen und okonomischen Gesichtspunkten: 125 pp.



A theoretical comparison was made of the maintenance of cattle populations by (1) a population of 16 bulls and 64 cows, divided into subpopulations, (2) a semen bank of unrelated sires, with 1500 semen doses per sire, for reconstituting a breed by upgrading, (3) a bank of >=300 embryos and 100 semen doses from each of 25 sires, for use through embryo transfer,(4) 2100 semen doses from each of 20 sires, plus 35 cows, with mating only by AI, and (5) 50 cows, 2 natural service sires produced by AI, and 200 semen doses from each of 15 sires. For the 5 methods respectively, inbreeding over the same timespan was 12.88, 0.64, 3.06, 1.76 and 2.99%. Method 1 had the highest discounted costs, and method 3 was cheaper than method 2, but the set-up costs for a semen bank were only approximately one-third of those for an embryo bank. The discounted costs were similar for methods 4 and 5, and were the cheapest of the 5 methods. It was concluded that, taking into account inbreeding, risk, practicability and costs, the best methods were those that combined the maintenance of live animals of the breed to be conserved with cryoconservation of gametes (i.e. methods 4 and 5).

Accession: 002390309

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