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Ecophysiological and Productive Properties as Tool for Breeding of Maté (Ilex paraguariensis St. Hil.) PFB - Pesquisa Florestal Brasileira
Rakocevic, Miroslava; Sturion, José Alfredo; Medrado, Moacir José Sales; Lavoranti, Osmir José; Mosele, Sérgio Henrique; Valduga, Alice Tereza.
The aims of this study were to estimate the genetic parameters for 59 half-sib progenies of maté under runing for formation, and to evaluate the ecophysiological properties for four progenies (P15, P18, P41 e  47) and two controls (P61 and P62), components of one maté breeding experiment combining  rovenances and progenies, established in Erechim, RS. The ecophysiological properties (stomatal  onductance (gs) - mol m-2s-1, net photosynthesis (A) - μmol CO2 m-2s-1, and transpiration (E) -mmol H2O  - s-1) were measured during one year in five epochs (from September 2002 to August 2003). The variance  omponents, genetic and phenotypic parameters and genetic values (for data of foliar mass collected in  runing of formation) were obtained using a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic value; Heritability; Photosynthesis; Stomatal conductance; Transpiration. Condutância estomática; Fotossíntese; Herdabilidade; Transpiração; Valor genético..
Ano: 2011 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/229
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Neural networks for predicting breeding values and genetic gains Scientia Agricola
Silva,Gabi Nunes; Tomaz,Rafael Simões; Sant'Anna,Isabela de Castro; Nascimento,Moysés; Bhering,Leonardo Lopes; Cruz,Cosme Damião.
Analysis using Artificial Neural Networks has been described as an approach in the decision-making process that, although incipient, has been reported as presenting high potential for use in animal and plant breeding. In this study, we introduce the procedure of using the expanded data set for training the network. Wealso proposed using statistical parameters to estimate the breeding value of genotypes in simulated scenarios, in addition to the mean phenotypic value in a feed-forward back propagation multilayer perceptron network. After evaluating artificial neural network configurations, our results showed its superiority to estimates based on linear models, as well as its applicability in the genetic value prediction process. The results further...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic value; Statistics; Simulation; Artificial intelligence; Training strategy.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600008
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Reaction norms models in the adjusted weight at 550 days of age for Polled Nellore cattle in Northeast Brazil R. Bras. Zootec.
Ambrosini,Diego Pagung; Carneiro,Paulo Luiz Souza; Braccini Neto,José; Martins Filho,Raimundo; Amaral,Rosimira dos Santos; Cardoso,Fernando Flores; Malhado,Carlos Henrique Mendes.
The objective of this study was to evaluate the genotype-environment interaction (GEI) in the body weight adjusted to 550 days of age (W550) of Polled Nellore cattle raised in Northeastern Brazil using reaction norms (RN) models. Hierarchical RN models included fixed effects for age of cow (linear and quadratic) and random effects for contemporary groups (CG) and additive genetic RN level and slope. Four RN hierarchical models (RNHM) were used. The RNHM2S uses the solutions of contemporary groups estimated by the standard animal model (AM) and considers them as environmental level for predicting the reaction norms and the RNHM1S, which jointly estimate these two sets of unknowns. Two versions were considered for both models, one with a homogeneous (Hm) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bayesian inference; Environmental gradient; Genetic value; Random regression; Zebu cattle.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000700351
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