The ability to move semen, embryos or live animals between countries provides the opportunity to select breeding stock from an international gene pool. This opportunity is already being utilised in Holstein cattle and will increasingly be utilised by other breeds and species in the future. The advantage of access to a wider range of genotypes must be compared with the disadvantages of higher cost, reduced suitability to local requirements and reduced effective population size of the breed internationally. The aim of this paper is to consider the criteria that should be used in selecting animals for importation and the way in which these animals should be used in the importing country. 

Michael E Goddard, K. T Beard

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 23–29, 1994
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