Genetic variation among breeds offers an oportunity to develop efficient cattle for the diversity of cattle production systems. In the tropics where resistance to the adverse environment is essential to realize potential production, it is necessary to amalgamate resistance and potential production through practical breeding schemes that can be iuplemented at ccnmercial level. In this paper a breeding system that combines crossbreeding and selection in a Open Nucleus breeding Unrt linked to commercial herds and that is generally called Open Nucleous Crossbreeding System is presented.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 495–498, 1994
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