Gama, Luís Lavadinho Telo daLucas, António VascoMocho, Sílvia Bernardo2013-03-122013-03-122012Mocho, S.B. - Variabilidade genética para características de lide na raça brava. Lisboa: ISA, 2012, 113 p.http://hdl.handle.net/10400.5/5337Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia / Faculdade de Medicina VeterináriaFunctional records were collected in 584 heifers born between 2001 and 2009 in the Murteira Grave herd of the Brava breed. These records were collected on the farm, in conditions known as “tenta”, which intends to simulate a bullfight and serve as the basis for selection in this breed. The traits recorded were physical type (trapío), bravery (bravura) and ability for bullfight (toureabilidade), which were scored on a scale from 1 to 10. Additionally, a pedigree file was built for the herd, based on the records existing in the Associação Portuguesa de Criadores de Touros de Lide. These records covered the period 1970- 2010, and included 4631 animals. The demographic analysis indicates that the Murteira Grave herd has been able to maintain inbreeding at very moderate levels (0.019±0.019), mostly by introducing animals from other herds periodically. This has resulted in a well-structured population, with a diversified representation of several founders and ancestors. Taken together, the results of our study indicate that the tenta traits evaluated have high levels of genetic variability (h2 =0.24 a 0.45), which provide the foundations for a good selection program with appropriate response. On the other hand, the genetic correlations among the traits selected for are positive, indicating that the improvement in one of the traits will not cause a deterioration in the others, and that benefits will result from the joint selection for the different traits.porBrava breedtentagenetic variabilitydemographyheritabilitycorrelationsmaster thesis