Genetic value

Genetic evaluation of milk yield in Alpine goats for the first four lactations using random regression models

F. G. Silva, Torres, R. A., Silva, L. P., Ventura, H. T., Silva, F. F., Carneiro, A. P. S., Nascimento, M., and Rodrigues, M. T., Genetic evaluation of milk yield in Alpine goats for the first four lactations using random regression models, vol. 13, pp. 10943-10951, 2014.

Random regression models have been used in evaluating test-day milk yield, providing accurate estimates of genetic values in animals. However, herd evaluation with only information from the first lactation may not be the best option from an economic perspective. Other factors should be taken into account, particularly other lactations. Our objective in this study was to analyze the genetic divergence between the first four lactations of Alpine goats.

Adaptability and genotypic stability of Coffea arabica genotypes based on REML/BLUP analysis in Rio de Janeiro State, Brazil

W. P. Rodrigues, Vieira, H. D., Barbosa, D. H. S. G., Filho, G. R. Souza, and Candido, L. S., Adaptability and genotypic stability of Coffea arabica genotypes based on REML/BLUP analysis in Rio de Janeiro State, Brazil, vol. 12, pp. 2391-2399, 2013.

Biannuality in coffee culture causes temporal variability in plant productivity. Consequently, it is essential to evaluate genotypes during various crop years to ensure selection of productive and stable genotypes. We evaluated the effectiveness of simultaneous selection of coffee genotypes along harvests, based on productivity, stability, and adaptability, via mixed models, for indication of varieties suitable for Rio de Janeiro State. We evaluated 25 genotypes during 4 crop seasons (2009-2012), in a randomized block design with 5 replications.

Genetic trends of abdominal fat content in a male broiler chicken line

Lde Genova Gaya, Mourão, G. Barreto, de Rezende, F. Marcondes, de Mattos, E. Chicaroni, Filho, T. Michelan, Figueiredo, L. Gustavo Gi, Ferraz, J. Bento Ster, and Eler, J. Pereira, Genetic trends of abdominal fat content in a male broiler chicken line, vol. 4, pp. 760-764, 2005.

Data of chickens from a broiler-breeding program were collected and used to determine the genetic trends of absolute and relative abdominal fat content. The genetic trends were estimated by the regression of trait genetic value averages on hatch-years. Genetic values from 32,485 individuals were used for regression analysis. The genetic trend estimate for absolute abdominal fat content was +0.39 g per year, indicating that abdominal fat deposition in the analyzed line, in absolute terms, tended to increase, making the existing excess fat deposition in the broilers even worse.

Genetic trends of absolute and relative heartweight in a male broiler line

L. G. Gaya, Costa, A. M. M. A., Ferraz, J. B. S., Rezende, F. M., Mattos, E. C., Eler, J. P., T. Filho, M., Mourão, G. B., and Figueiredo, L. G. G., Genetic trends of absolute and relative heartweight in a male broiler line, vol. 6, pp. 1091-1096, 2007.

Data of chickens from a broiler-breeding program have been collected and used for determination of genetic trends of absolute and relative heart weight. The genetic trends have been estimated by regression of the genetic values of the traits over hatch-year. Genetic values of 42,912 individuals, obtained by restricted maximum likelihood, were used for regression analysis. The estimates of the genetic trends for absolute and relative heart weight were found to be -0.08 g and -0.004% per hatch-year, respectively.

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