Perspectivas da avaliação genética multirracial em bovinos no Brasil
Carregando...
Data
2004-12
Título da Revista
ISSN da Revista
Título de Volume
Editor
José Henrique Stringhini
Resumo
Availability of large numbers of records from
purebred and crossbred animals in cattle organizations, and
increased demand from producers to have genetic
predictions for both purebred and crossbred animals has
renewed interest in the implementation of multibreed genetic
evaluation procedures. Multibreed genetic evaluation
procedures are currently used for the genetic evaluation of
purebred and crossbred animals in most US breed
associations. Brazil with its enormous cattle population (167
million), composed largely of Zebu and Zebu crossbreds
(80%), and many well-organized large size cattle operations
(many with 10,000 cattle or more) is likely to have a substantial
number of datasets amenable to be analyzed using
multibreed genetic evaluation procedures. Currently,
however, only intrabreed genetic evaluation procedures are
used in Brazil regardless of the breed composition of cattle
populations. Intrabreed procedures ignore interbreed
nonadditive genetic effects, and assume that genetic parameters are the same in all breed groups. Multibreed
genetic evaluation procedures account for both aspects,
thus they should be preferred to intrabreed procedures to
genetically evaluate populations composed of purebred and
crossbred animals. Multibreed genetic evaluation
procedures yield more accurate additive genetic predictions,
permit direct comparison of animals of different breed
composition, and allow additive and nonadditive genetic improvement in multibreed populations. However, they are
more complex computationally, require larger number of
genetic parameters, and have problems of confounding and
multicollinearity. Here, multibreed populations are
characterized, genetic evaluation models, procedures, and
implementation issues are discussed, and general comments
relative to the Brazilian multibreed situation are made when
relevant.
Descrição
Palavras-chave
Bovinos, Cruzamento, Avaliação genética, Multirracial, Predição, Cattle, Crossbreeding, Genetic evaluation, Multibreed, Prediction
Citação
ELZO, Mauricio A.; BORJAS, Arcadio de los Reyes. Perspectivas da avaliação genética multirracial em bovinos no Brasil. Ciência Animal Brasileira, Goiânia, v. 5, n. 4, p.171-183, out./dez. 2004. Disponível em: <https://www.revistas.ufg.br/vet/article/view/342/317>.