Selection index

Genetic gains in the UENF-14 popcorn population with recurrent selection

I. L. J. Freitas, Júnior, A. Tdo Amaral, Freitas, Jr., S. P., Cabral, P. D. S., Ribeiro, R. M., and Gonçalves, L. S. A., Genetic gains in the UENF-14 popcorn population with recurrent selection, vol. 13, pp. 518-527, 2014.

The popcorn breeding program of Universidade Estadual do Norte Fluminense Darcy Ribeiro aims to provide farmers a cultivar with desirable agronomic traits, particularly with respect to grain yield (GY) and popping expansion (PE). We evaluated full-sib families from the seventh cycle of recurrent selection and estimated the genetic progress with respect to GY and PE.

Comparison of bivariate and multivariate joint analyses on the selection loss of beef cattle

V. B. Pedrosa, Groeneveld, E., Eler, J. P., and Ferraz, J. B. S., Comparison of bivariate and multivariate joint analyses on the selection loss of beef cattle, vol. 13, pp. 4036-4045, 2014.

For genetic evaluation of beef cattle, univariate or bivariate analyses are often performed as an alternative to decrease the complexity of matrices and mathematical models compared to multivariate analysis, which considers a larger number of joint traits. The use of bivariate methods to calculate genetic predictors may cause bias in the estimation of breeding values and, as a consequence, reclassification of the rank of top-selected sires, resulting in a loss of genetic gain in future generations.

Genetic progress in the UNB-2U population of popcorn under recurrent selection in Rio de Janeiro, Brazil

R. M. Ribeiro, Júnior, A. Tdo Amaral, Gonçalves, L. S. A., Candido, L. S., Silva, T. R. C., and Pena, G. F., Genetic progress in the UNB-2U population of popcorn under recurrent selection in Rio de Janeiro, Brazil, vol. 11, pp. 1417-1423, 2012.

As part of the Universidade Estadual do Norte Fluminense recurrent selection program of popcorn, we evaluated full-sib families of the sixth cycle of recurrent selection and estimated genetic progress for grain yield and expansion capacity. We assessed 200 full-sib families for 10 agronomic traits, in a randomized block design, with two replications within sets in two environments: Campos dos Goytacazes and Itaocara, in the State of Rio de Janeiro, Brazil.

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