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The ancestry of New World cattle was investigated through the analysis of mitochondrial and Y chromosome variation in Creoles from Argentina, Brazil, Mexico, Paraguay and the United States of America. Breeds that influenced the Creoles, such as Iberian native, British and Zebu, were also studied....

Ginja, C.; Penedo, M. C. T.; Melucci, L.; Quiroz, J.; Martínez López, O. R.; Revidatti, M. A.; Martínez-Martínez, A.; Delgado, J. V.; Gama, L. T.
Blackwell Publishing Ltd, Oxford, UK
Animal Genetics, 2010, 41, 2, pp 128-141

A report on the breeding stock of King Ranch. This ranch originally used Mexican Long Horns, a quick maturing breed but of poor carcass quality. Grossed with Shorthorns and Herefords somewhat better carcasses were produced but the hybrids were less resistant to the hot humid climate and the local...

Revue d'Élevage et de Médecine Vétérinaire des Pays Tropicaux, 1949, 3, pp 167-174