SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

A polygenic hypothesis for sex determination in the European sea bass - Dicentrarchus labrax

JANK, L.; GONTIJO NETO, M.; RESENDE, M. D. V.; LAURA, V. A.; CALIXTO, S.; RESENDE, R. M. S.; VALLE, C. B. do.

Sistemas silvipastoris são uma alternativa sustentável de produção animal e vegetal e sua utilização tem crescido nos últimos anos. Seu sucesso depende da identificação de gramíneas tolerantes ao sombreamento. Com o objetivo de avaliar parâmetros genéticos que possam determinar a seleção e o melhoramento de Panicum maximum, foi realizado um experimento na Embrapa Gado de Corte, em Campo Grande, MS, em vasos, com 25 genótipos promissores sob três níveis de sombreamento artificial (0, 50 e 70%). Foram realizados quatro cortes e avaliados as produções das matérias secas total e foliar e de raízes no último corte, porcentagem de folhas, altura das plantas, número de perfilhos e valores SPAD. Altas herdabilidades foram encontradas para numero de perfilhos,...

Tipo: Parte de livro

Palavras-chave: Sistema silvipastoril; Herdabilidade; Sombra; Campo Grande; Mato Grosso do Sul; Brasil; Agrosilvopastoral systems; Selection; Genetic parameters; Feed crops; Feed grasses; Shading.; Agrossilvicultura; Gramínea Forrageira; Melhoramento Genético Vegetal; Panicum Maximum; Planta Forrageira; Parâmetro Genético; Seleção; Sombreamento.; Agroforestry; Brazil; Heritability; Plant breeding..

Ano: 2006

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/326561

ArchiMer

Vandeputte, Marc; Dupont Nivet, M; Chavanne, H; Chatain, Beatrice.

Polygenic sex determination, although suspected in several species, is thought to be evolutionarily unstable and has been proven in very few cases. In the European sea bass, temperature is known to influence the sex ratio. We set up a factorial mating, producing 5.893 individuals from 253 full-sib families, all reared in a single batch to avoid any between-families environmental effects. The proportion of females in the offspring was 18.3%, with a large variation between families. Interpreting sex as a threshold trait, the heritability estimate was 0.62 +/- 0.12. The observed distribution of family sex ratios was in accordance with a polygenic model or with a four-sex-factors system with environmental variance and could not be explained by any genetic...

Tipo: Text

Palavras-chave: Dicentrarchus labrax; Fish; Growth; Heritability; Sex ratio.

Ano: 2007

URL: http://archimer.ifremer.fr/doc/2007/publication-3526.pdf

Adjustment of lactation curves of Holstein cows from herds of Minas Gerais, Brazil.

AZEVEDO JUNIOR, J.; GONÇALVES, T. de M.; SOUZA, J. C. de; RODRIGUEZ, M. A. P.; COSTA, C. N.; CARVALHEIRA, J. G. V..

Abstract Random regression models (RRM) differ in terms of the functions used to describe the shape of lactation curves. The aim was to compare random regression models under different functions to describe the lactation curves from Holstein cows in herds of the state of Minas Gerais. A database of 28,118 production records was analyzed using the test-day records of 4,230 first parity cows from five herds. The Wilmink, Ali & Schaeffer and Legendre polynomial (orders 4, 5 and 6) functions were adjusted in RRM to model the mean production trend (fixed) and genetic and permanent environmental (random) effects. The residual variances were assumed to be constant throughout lactation. Analyses were performed using the AIREMLF90 program. Except for the model...

Tipo: Separatas

Palavras-chave: Models comparison; Permanent environmental effects; Random regression model; Dairy cattle; Heritability.

Ano: 2018

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103873

Allele frequency and selection efficiency in cross populations of Andean x Mesoamerican common beans (Phaseolus vulgaris L. Fabales, Fabaceae)

Genet. Mol. Biol.

Baldoni,Aisy B.; Ramalho,Magno A. Patto; Abreu,Ângela de Fátima B..

Strategies were investigated for improving efficiency in the use of segregating common bean (Phaseolus vulgaris) populations using crosses between the Andean cultivar BRS-Radiante and the Mesoamerican parent cultivar Carioca-MG by developing populations with 12.5%, 25%, 50%, 75% and 87.5% of the allele frequency of one of the parents. For each of the five populations we evaluated for two traits, the number of days to the beginning of flowering and grain yield (g plot-1), in the F2:3 (sown in February 2006) and F2:4 (sown in July 2006) generation progenies using 15 x 15 lattice design experiments, with 44 progenies (n = 220 plants) plus the two parents and three controls being evaluated for each generation. In terms of variability release, the populations...

Allohexaploid pearl millet x elephantgrass population potential for a recurrent selection program

Palavras-chave: Backcross; Gene pools; Heritability; Phaseolus vulgaris; Selection gain.

Ano: 2008

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500019

Reis,Matheus Costa dos; Sobrinho,Fausto Souza; Ramalho,Magno Antônio Patto; Ferreira,Daniel Furtado; Ledo,Francisco José Silva; Pereira,Antônio Vander.

The objective of this work was to evaluate the potential of allohexaploid pearl millet x elephantgrass (HGL) population for a recurrent selection program through open-pollinated progenies. Seventy-eight progenies, one representative sample of the population, and two commercial cultivars, Pioneiro and Paraíso, were evaluated in a 9x9 triple lattice design, in two sites. Plant height and dry matter yield were evaluated in three and four cuts, respectively. For plant height, the 17 best progenies were similar to both commercial controls, while for dry matter yield they were higher than 'Paraíso' and lower than 'Pioneiro'. The correlation between progenies and cuts indicated that the fourth cut represents the mean of all cuts, and the possibility of using...

Aplicability of phenotypic and canonic correlations and path coefficients in the selection of oat genotypes

Palavras-chave: Pennisetum; Heritability; Response to selection; Split-plot lattice design.

Ano: 2008

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000200006

Scientia Agricola

Lorencetti,Claudir; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Valério,Igor Pirez; Hartwig,Irineu; Benin,Giovani; Schmidt,Douglas André Mallmann.

Indirect selection through traits of higher heritability and of case measurements can result in larger genetic progress compared to using direct selection. This work was performed with the following objectives: (1) to estimative the phenotypic correlations between individual plant grain yield and agronomic traits of importance in the selection of white oat (Avena sativa L.) genotypes; (2) to identify traits that have the higher direct and indirect effects on grain yield; (3) to determine the intensity of association between primary and secondary components of grain yield; and, (4) to evaluate the consistency of these estimates using five oat genotypes crossed in a diallel format. The number of panicles per plant (NPP) showed to be the trait highest...

Assessment of genetic parameters of degradability in maize grains due to indentation scores

Palavras-chave: Avena sativa L.; Heritability; Indirect selection.

Ano: 2006

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100003

Scientia Agricola

Davide,Livia Maria Chamma; Ramalho,Magno Antônio Patto; Figueiredo,Ulisses José de; Souza,João Cândido de.

Maize (Zea mays L.) cultivars with dent grains present higher starch and dry matter ruminal degradability than those with flint grains. This study aimed to assess genetic parameters of degradability in maize grains of different textures and to verify whether there is an association between grain indentation score and ruminal dry matter (RDM) degradability. The evaluated progenies were obtained from the cross between the varieties Cristal (flint) and Cunha (dent), previously selected for grain hardness. Progenies were evaluated for an indentation score using a visual grading scale ranging from 1 (flint) to 5 (dent). To assess the RDM degradability, 5 g were cut into halves, weighed (five grams), stored in bags made of 100% "failet" cloth and incubated for...

Assessment of opportunities to map pearl millet tolerance to salinity during germination and early seedling growth

Palavras-chave: Grain hardness; Ruminal dry matter degradability; Heritability.

Ano: 2011

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300012

Open Agri

Mukhopadhyay, R..

Palavras-chave: Millets; Tolerance; Genotypes; Phenotypes; Genetic markers; Genomes; Heritability; Soil salinization; Feed crops; Humus.

Ano: 2005

URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3215

Associação genética negativa entre prolificidade e peso ao nascer em ovinos da raça Morada Nova criados no semiárido.

Associations among growth, scrotal circumference, and visual score of beef cattle in performance tests on pasture or in feedlots

SOUSA, D. R. de; MARTINS JUNIOR, C. T.; LOBO, R. N. B.; SHIOTSUKI, L.; FACO, O..

Resumo: Os dados utilizados neste estudo foram provenientes de ovinos da raça Morada Nova, pertencentes à rebanhos participantes do Núcleo de Melhoramento Genético Participativos de Ovinos da Raça Morada Nova e inseridos no Programa de Melhoramento Genético de Caprinos e Ovinos de Corte ? GENECOC. A matriz de parentesco utilizada continha 4.342 animais. Previamente, as características prolificidade (PROL) e peso ao nascimento (PN) foram analisadas utilizando o procedimento MIXED do programa SAS®, para definição dos efeitos fixos que comporiam o modelo de análise. Assim, foram incluídos no modelo os efeitos de grupo contemporâneo (animais paridos na mesma estação e ano e submetidos ao mesmo manejo), ordem de parto e efeito de ambiente permanente do animal,...

Tipo: Parte de livro

Palavras-chave: Herdabilidade; Correlação genética; Prolificidade; Raça Morada Nova; Ovino; Melhoramento genético animal; Peso ao nascer; Sheep; Birth weight; Genetic improvement; Genetic correlation; Heritability.

Ano: 2013

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/982830

R. Bras. Zootec.

Raidan,Fernanda Santos Silva; Tineo,Juan Salvador Andrade; Moraes,Mariana Mamedes de; Escarce,Thiago Campos; Araújo,Andresa Eva Melo de; Gomes,Muller Marques de Carvalho; Ventura,Henrique Torres; Toral,Fabio Luiz Buranelo.

ABSTRACT This study aimed to evaluate associations among final weight (FW), average daily gain (ADG), scrotal circumference (SC), and visual score (VS) of beef cattle in performance tests on pasture or in feedlots. Genetic parameters for FW, ADG, SC, and VS of young Nellore bulls performance-tested on pasture or in feedlots were evaluated by mixed model. The performance test and final age were considered as fixed effects and additive genetic and residual effects were considered as random effects. Additive genetic and residual variances for final weight and average daily gain were smaller on pasture than in feedlots. There was no difference between genetic and residual variances and heritability for scrotal circumference on pasture or in feedlots. Genetic...

Avaliação de acessos de Brachiaria brizantha Stapf e estimativas de parâmetros genéticos para caracteres agronômicos.

Palavras-chave: Bos indicus; Genetic correlation; Heritability; Phenotypic selection.

Ano: 2017

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400309

Avaliação de modelos uni e bicaracterística na estimativa de parâmetros genéticos de características leiteiras de cabras Saanen.

BASSO, K. C.; SIMEÃO, R. M.; VALLE, C. B. do; GONÇALVES, M. C.; LEMPP, B..

Atualmente, a Brachiaria brizantha Stapf é a gramínea forrageira tropical com maior área cultivada, no Brasil, e é responsável por grande parte do mercado de sementes e pelo incremento na produtividade animal. São muitos os genótipos superiores originários do continente africano que estão contidos nos bancos de germoplasma. A seleção dos genótipos mais promissores deve ser realizada com base nos valores genotípicos preditos dos indivíduos. O procedimento-padrão para a predição de valores genéticos é o BLUP individual, usando estimativas de componentes de variância obtidas pelo método de máxima verossimilhança restrita (REML) em um modelo individual. Com o objetivo de selecionar os materiais superiores para características agronômicas, foram avaliados 218...

Tipo: Artigo de periódico

Palavras-chave: Brachiaria Brizantha; Genótipo; Gramínea Forrageira; Melhoramento Genético Vegetal; Parâmetro Genético; Pastagem; Genetic correlation; Genotype; Heritability; Plant breeding.

Ano: 2009

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/327052

Avaliação de progênies de macaúba na fase juvenil e estimativas de parâmetros genéticos e diversidade genética

ALVES, A. A. C.; PINZON, A. C.; LOBO, A. M. B. O.; FACO, O.; LOBO, R. N. B..

Resumo: Foram utilizadas 643 lactações de 261 cabras da raça Saanen para avaliar a eficiência dos modelos unicaracterística e bicaracterística em estimar parâmetros genéticos para as características produção de leite até 305 dias (PL305) e duração da lactação (DL). Os componentes de variância, bem como os parâmetros genéticos foram estimados pelo método da Máxima Verossimilhança Restrita Livre de Derivadas (DFREML) sob modelo animal. A matriz de parentesco continha 1.548 animais. As estimativas dos parâmetros genéticos para as características estudadas foram similares para os modelos avaliados. Entretanto, o modelo bicaracterística permitiu melhor utilização das informações disponíveis acerca das características estudadas. [Evaluation of single and...

Tipo: Anais e Proceedings de eventos

Palavras-chave: Raça Saanen; Animal model.; Caprino; Cabra leiteira; Melhoramento genético animal; Goats; Genetic correlation; Heritability; Milk yield; Animal genetics; Animal breeding..

Ano: 2015

URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1034779

PFB - Pesquisa Florestal Brasileira

Manfio, Candida Elisa; Motoike, Sérgio Yoshimitsu; Resende, Marcos Deon Vilela de; Santos, Carlos Eduardo Magalhães dos; Sato, Aurora Yoshiko.

A macaúba (Acrocomia aculeata) é uma palmeira oleaginosa e o extrativismo de seus frutos é de grande importância socioeconômica para os pequenos produtores rurais. O objetivo deste trabalho foi avaliar a variabilidade genética e obter informações sobre o controle genético de características morfológicas relacionadas ao crescimento e vigor da macaúba. Foram coletadas 51 progênies em Minas Gerais e São Paulo, as quais são integrantes do banco ativo de germoplasma da Universidade Federal de Viçosa. Doze meses após o plantio, essas progênies foram avaliadas quanto ao crescimento da planta (cm) e número de folhas emitidas. Estas características apresentaram grande variabilidade entre as progênies. As estimativas dos coeficientes de herdabilidade foram de 87% e...

Bayesian Analysis of the Genetic Control of Survival in F3 Families of Common Bean

Palavras-chave: Acrocomia aculeata; Variabilidade genética; Recursos genéticos; Herdabilidade Acroconia aculeata; Genetic variability; Genetic resources; Heritability.

Ano: 2012

URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/283

Chilean J. Agric. Res.

Mora,Freddy; Gonçalves-Vidigal,Maria C; Santos,Alexandra I.

The objectives of this study were to examine the genetic control of survival in segregant families F3 of the common bean (Phaseolus vulgaris L.) in southern Brazil during the 2004-2005 growing season, to identify useful genotypes for the breeding program of this crop, and to determine the genetic association between survival and weight of 100 seeds (production trait; P100). A Bayesian approach was used to predict breeding values and to estimate variance components. Survival was recorded as a binary response: dead plant or live plant during harvest. The total population consisted of 11,520 individual plants. The difference in the magnitude between the best and the worst families was as high as 22%, and varied from 57 to 73%. Survival was found to be highly...

Tipo: Journal article

Palavras-chave: Genetic improvement; Breeding; Gibbs algorithm; Heritability.

Ano: 2008

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400003

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil

Santos,Alexandra Inês; Ribeiro,Ricardo Pereira; Vargas,Lauro; Mora,Freddy; Alexandre Filho,Luiz; Fornari,Darci Carlos; Oliveira,Sheila Nogueira de.

The objective of this study was to estimate genetic parameters for survival and weight of Nile tilapia (Oreochromis niloticus), farmed in cages and ponds in Brazil, and to predict genetic gain under different scenarios. Survival was recorded as a binary response (dead or alive), during harvest time in the 2008 grow-out period. Genetic parameters were estimated using a Bayesian mixed linear-threshold animal model via Gibbs sampling. The breeding population consisted of 2,912 individual fish, which were analyzed together with the pedigree of 5,394 fish. The heritabilities estimates, with 95% posterior credible intervals, for tagging weight, harvest weight and survival were 0.17 (0.09-0.27), 0.21 (0.12-0.32) and 0.32 (0.22-0.44), respectively. Credible...

Biometric analysis of protein and oil contents of soybean genotypes in different environments

Palavras-chave: Oreochromis niloticus; Correlation; Fish genetic improvement; Gibbs sampling; GIFT strain; Heritability.

Ano: 2011

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000100005

Rodrigues,Josiane Isabela da Silva; Arruda,Klever Márcio Antunes; Cruz,Cosme Damião; Piovesan,Newton Deniz; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves.

The objective of this work was to identify by biometric analyses the most stable soybean parents, with higher oil or protein contents, cultivated at different seasons and locations of the state of Minas Gerais, Brazil. Forty-nine genotypes were evaluated in the municipalities of Viçosa, Visconde do Rio Branco, and São Gotardo, in the state of Minas Gerais, from 2009 to 2011. Protein and oil contents were analyzed by infrared spectrometry using a FT-NIR analyzer. The effects of genotype, environment, and genotype x environment interaction were significant. The BARC-8 soybean genotype is the best parent to increase protein contents in the progenies, followed by BR 8014887 and CS 3032PTA276-3-4. Selection for high oil content is more efficient when the...

Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods

Palavras-chave: Glycine max; FT-NIR; Genotype x environment interaction; Heritability.

Ano: 2014

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000600475

Resende,Rosangela Maria Simeão; Jank,Liana; Valle,Cacilda Borges do; Bonato,Ana Lídia Variani.

The objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum...

Tipo: Info:eu-repo/semantics/report

Palavras-chave: Guineagrass; Apomixis; Breeding; Heritability; Repeatability; Selection of parents.

Ano: 2004

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000400006

Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605

Agronomy

Basso, Kelen Cristina; UEM; Resende, Rosangela Maria Simeão; EMBRAPA; Valle, Cacilda Borges do; EMBRAPA; Gonçalves, Manoel Carlos; UFGD; Lempp, Beatriz; UFGD.

Currently, Brachiaria brizantha Stapf is the tropical grass with the largest cultivated area in Brazil, being responsible for a major part of the seed market and for the increase in animal production. There are several superior genotypes available in germplasm banks, collected from the African continent and in need of evaluation. The selection of these genotypes must be based on predicted genotype values of the individuals in function of being perennial plants and of unsexed propagation. The standard procedure for the prediction of genetic values is the individual BLUP (Best Linear Unbiased Predictor), using estimates of variance components achieved by the restricted maximum likelihood (REML) on an individual model. With the aim of selecting B. brizantha...

Palavras-chave: Genetic correlation; Tropical forage; Heritability; REML/BLUP; Repeatability; Genotypes 5.02.01.03-4 Genética e Melhoramento Florestal correlação genética; Gramínea tropical; Herdabilidade; REML/BLUP; Repetibilidade; Genótipos..

Ano: 2009

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605

Breeding of Acrocomia aculeata using genetic diversity parameters and correlations to select accessions based on vegetative, phenological, and reproductive characteristics.