The "Caballo Chileno" is one the oldest horse breed of America and it has been maintained closed since 1893. Little is known about the population structure of this breed. In this paper, different measures of genetic variability (based on the genetics contribution theory) were assessed using complete pedigrees of the two largest studs of the breed. All of these measures suggest that a great proportion of the variability has been lost in the actual population, mainly due to excess use of some stallions and their relatives within each stud. There has been little migration between studs. A very small proportion of founders' genomes are still present in the population. These results suggest that it is necessary to develop mating strategies between studs to account for random loss of genetic variation.

F. Lara, V. Martinez

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 08.05, 2006
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