Thesis Abstract

Related GMR Articles

06/18/2015
Backpropagation; Heritability; Improvement; Programming; Testing

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 ... more

L.A. Peixoto; L.L. Bhering; C.D. Cruz
05/29/2015
Genetic variance; Genotype by environment interaction; Heritability; Phaseolus vulgaris L.

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 ... more

V.A.P. Júnior; P.G.S. Melo; H.S. Pereira; P.Z. Bassinello; L.C. Melo
06/30/2007
Cubic spline; Genetic parameters; Random regression

Genetic parameters were estimated with restricted maximum likelihood for individual test-day milk, fat, and protein yields and somatic cell scores with a random regression cubic spline model. Test-day records of Holstein cows that calved from 1994 through early 1999 were obtained from Dairy Records Management Systems in Raleigh, North Carolina, for the analysis. Estimates of ... more

B.J. DeGroot; J.F. Keown; L.D. Van Vleck; S.D. Kachman
03/09/2007
Bovine somatotropin; Estimated breeding values; Genetic parameters; Milk yield ranking; Somatic cell score

Records of Holstein cows were used to examine how different models account for the effect of bovine somatotropin (bST) treatment on genetic evaluation of dairy sires for yield traits and somatic cell score. Data set 1 included 65,720 first-lactation records. Set 2 included 50,644 second-lactation records. Set 3 included 45,505 records for lactations three, four and five. Estimated ... more

A. Al-Seaf; J.F. Keown; L.D. Van Vleck
03/09/2007
Bovine somatotropin; Genetic parameters; Milk yield; Somatic cell score

Records of Holstein cows from the Dairy Records Processing Center at Raleigh, NC were edited to obtain three data sets: 65,720 first, 50,694 second, and 65,445 later lactations. Correlations among yield traits and somatic cell score were estimated with three different models: 1) bovine somatotropin (bST) administration ignored, 2) bST administration as a fixed effect and 3) ... more

A. Al-Seaf; J.F. Keown; L.D. Van Vleck
12/19/2012
Bayesian inference; Beef cattle; Fertility; Genetic parameters

We estimated heritability for subsequent rebreeding (SR) of heifers and genetic correlations between this trait and weaning weight (WW), weight gain from weaning to yearling (WG), age at first calving (AFC), and mature cow weight (MW), in order to evaluate whether SR could be included as selection criterion in Nellore cattle. The SR of heifers was defined by attributing a value of 1 ( ... more

A.A. Boligon; F. Baldi; L.G. Albuquerque
06/15/2012
Covariance function; Dairy cattle; Genetic parameters; Milk yield persistency

With the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was ... more

R.J. Pereira; R.S. Verneque; P.S. Lopes; M.L. Santana; M.R. Lagrotta; R.A. Torres; A.E.Vercesi Filho; M.A. Machado
02/20/2014
Correlations; Fleece traits; Genetic parameters; Makuie sheep breed; Post-weaning traits

Estimation of genetic parameters is the most important component of an organized selection program. With respect to economic traits, such as wool and mutton traits, production costs can be reduced through a suitable selection program focused on genetic improvement. This study aimed to evaluate genetic parameters of fleece and post-weaning growth traits in sheep. Greasy fleece weight at 6 ... more

S. Jafari; A. Hashemi
06/11/2015
Dominance; Genetic parameters; Piau pigs; Polygenic effect

Knowledge of dominance effects should improve ge­netic evaluations, provide the accurate selection of purebred animals, and enable better breeding strategies, including the exploitation of het­erosis in crossbreeds. In this study, we combined genomic and pedi­gree data to study the relative importance of additive and dominance genetic variation in growth and carcass traits in an F2 pig ... more

E.V. Costa; D.B. Diniz; R. Veroneze; M.D.V. Resende; C.F. Azevedo; S.E.F. Guimarães; F.F. Silva; P.S. Lopes
03/14/2005
Asparagus officinalis; Genetic correlations; Genetic gain

Despite the continuous breeding that has been conducted with asparagus (Asparagus officinalis L.) since the beginning of the last century, there is little information on parameters for predicting direct and indirect selection response. Yield traits for blanched asparagus production were studied along a two-year period in a half-sib family population planted in Zavalla, ... more

I. Gatti; F.López Anido; V. Cravero; P. Asprelli; E. Cointry

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