Heritability

Genetic potential of common bean progenies selected for crude fiber content obtained through different breeding methods

V. A. P. Júnior, Melo, P. G. S., Pereira, H. S., Bassinello, P. Z., and Melo, L. C., Genetic potential of common bean progenies selected for crude fiber content obtained through different breeding methods, vol. 14, pp. 5763-5774, 2015.

Gastrointestinal health is of great importance due to the increasing consumption of functional foods, especially those concern­ing diets rich in fiber content. The common bean has been valorized as a nutritious food due to its appreciable fiber content and the fact that it is consumed in many countries. The current study aimed to evalu­ate and compare the genetic potential of common bean progenies of the carioca group, developed through different breeding methods, for crude fiber content.

Artificial neural networks reveal efficiency in genetic value prediction

L. A. Peixoto, Bhering, L. L., and Cruz, C. D., Artificial neural networks reveal efficiency in genetic value prediction, vol. 14, pp. 6796-6807, 2015.

The objective of this study was to evaluate the efficiency of artificial neural networks (ANNs) for predicting genetic value in experiments carried out in randomized blocks. Sixteen scenarios were simulated with different values of heritability (10, 20, 30, and 40%), coefficient of variation (5 and 10%), and the number of genotypes per block (150 and 200 for validation, and 5000 for neural network training). One hundred validation populations were used in each scenario.

Genetic control of leaf curl in maize

G. C. Entringer, Guedes, F. L., Oliveira, A. A., Nascimento, J. P., and Souza, J. C., Genetic control of leaf curl in maize, vol. 13, pp. 1672-1678, 2014.

Among the many implications of climatic change on agriculture, drought is expected to continue to have a major impact on agribusinesses. Leaf curling is an anatomical characteristic that might be potentially used to enhance plant tolerance to water deficit. Hence, we aimed to study the genetic control of leaf curl in maize. From 2 contrasting inbred lines for the trait, generations F1, F2, and the backcrosses were obtained. All of these generations were evaluated in a randomized block design with 2 replicates.

Estimates of genetic parameters for total milk yield over multiple ages in Brazilian Murrah buffaloes using different models

R. C. Sesana, Baldi, F., Borquis, R. R. A., Bignardi, A. B., Hurtado-Lugo, N. A., L. Faro, E., Albuquerque, L. G., and Tonhati, H., Estimates of genetic parameters for total milk yield over multiple ages in Brazilian Murrah buffaloes using different models, vol. 13, pp. 2784-2795, 2014.

The objective of this study was to estimate variance components and genetic parameters for accumulated 305-day milk yield (MY305) over multiple ages, from 24 to 120 months of age, applying random regression (RRM), repeatability (REP) and multi-trait (MT) models. A total of 4472 lactation records from 1882 buffaloes of the Murrah breed were utilized. The contemporary group (herd-year-calving season) and number of milkings (two levels) were considered as fixed effects in all models.

Variability and performance evaluation of introgressed Nigerian dura x Deli dura oil palm progenies

A. Noh, Rafii, M. Y., A. Din, M., Kushairi, A., Norziha, A., Rajanaidu, N., Latif, M. A., and Malek, M. A., Variability and performance evaluation of introgressed Nigerian dura x Deli dura oil palm progenies, vol. 13, pp. 2426-2437, 2014.

Twelve introgressed oil palm (Elaeis guineensis) progenies of Nigerian dura x Deli dura were evaluated for bunch yield, yield attributes, bunch quality components and vegetative characters at the Malaysian Palm Oil Board Research Station, in Keratong, Pahang, Malaysia. Analysis of variance revealed significant to highly significant genotypic differences, indicating sufficient genetic variability among the progenies for bunch yield and its attributes, vegetative characters and bunch quality components, except fruit to bunch ratio.

Quantitative genetic study of age at subsequent rebreeding in Nellore cattle by using survival analysis

M. H. Van Melis, Figueiredo, L. G. G., Oliveira, H. N., Eler, J. P., Rosa, G. J. M., Santana, Jr., M. L., Rezende, F. M., and Ferraz, J. B. S., Quantitative genetic study of age at subsequent rebreeding in Nellore cattle by using survival analysis, vol. 13, pp. 4071-4082, 2014.

The continuous trait age at subsequent rebreeding (ASR) was evaluated using survival analysis in Nellore breed cows that conceived for the first time at approximately 14 months of age. This methodology was chosen because the restricted breeding season produces censored data. The dataset contained 2885 records of ASR (in days). Records of females that did not produce calves in the following year after being exposed to a sire were considered censored (48.3% of the total).

Genetic parameters for earnings in Quarter Horse

A. P. A. Silva, Curi, R. A., Langlois, B., and Silva, J. A. I. I. V., Genetic parameters for earnings in Quarter Horse, vol. 13, pp. 5840-5848, 2014.

In this study, we estimated the heritability (h2) of earnings in the Quarter Horse in order to evaluate the inclusion of this trait in breeding programs. Records from 14,754 races of 2443 horses from 1978-2009 were provided by Sorocaba Hippodrome, São Paulo, Brazil. All ancestors of the registered horses were included in the pedigree file until the 4th generation. Log-transformed performance measures (LPM) were analyzed for animals aged 2, 3, and 4 years and during their entire career.

Use of weaning management group as a random effect for a more robust estimation of genetic parameters for post-weaning traits in Nellore cattle

V. B. Pedrosa, Eler, J. P., Ferraz, J. B. S., and Groeneveld, E., Use of weaning management group as a random effect for a more robust estimation of genetic parameters for post-weaning traits in Nellore cattle, vol. 13, pp. 7013-7021, 2014.

Data from 69,525 animals were used to compare two types of analyses, one of them having the weaning management group (WEMANG) included as an effect in the contemporary group (F_WEMANG) and the other considering the weaning management group as a random effect, not related to the mathematical model (R_WEMANG) for post-weaning traits.

Genetic and phenotypic parameters of carcass and organ traits of broiler chickens

G. C. Venturini, Cruz, V. A. R., Rosa, J. O., Baldi, F., L. Faro, E., Ledur, M. C., Peixoto, J. O., and Munari, D. P., Genetic and phenotypic parameters of carcass and organ traits of broiler chickens, vol. 13, pp. 10294-10300, 2014.

The objective of this study was to estimate the genetic and environmental parameters for carcass, carcass part, and organ weights in a paternal strain of broiler chickens that was selected mainly for body weight at 42 days of age (BW42) to provide support for poultry genetic improvement programs. A total of 1448 chickens were used that resulted from the expansion of a pure paternal strain named TT, which was developed by Embrapa Suínos e Aves.

Genetic control of inflorescence in common bean

S. R. Guilherme, Ramalho, M. A. P., A. Abreu, deF. B., and Pereira, L. A., Genetic control of inflorescence in common bean, vol. 13, pp. 10349-10358, 2014.

The number of pods per common bean plant is a primary component of grain yield, which depends on the number of flowers produced and on the flower set. Thus, a larger number of flowers per plant would increase yield. Lines with inflorescences that had a large number of flowers compared to common bean plants now under cultivation were identified. We analyzed the genetic control of this trait and its association with grain yield. The cultivar BRSMG Talismã was crossed with 2 lines, L.59583 and L.59692, which have a large number of flowers.

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