Consulta: creatorFacets:"Ledur,Mônica Corrêa"
Registros recuperados: 14
Data/hora: 04/06/2024 11:34:11

Genetic parameters for body weight, carcass chemical composition and yield in a broiler-layer cross developed for QTL mapping
Provedor de dados: 74
Autores: Nunes,Beatriz do Nascimento; Ramos,Salvador Boccaletti; Savegnago,Rodrigo Pelicioni; Ledur,Mônica Corrêa; Nones,Kátia; Klein,Claudete Hara; Munari,Danísio Prado.
The objective of this study was to estimate genetic and phenotypic correlations of body weight at 6 weeks of age (BW6), as well as final carcass yield, and moisture, protein, fat and ash contents, using data from 3,422 F2 chickens originated from reciprocal cross between a broiler and a layer line. Variance components were estimated by the REML method, using animal models for evaluating random additive genetic and fixed contemporary group (sex, hatch and genetic group) effects. The heritability estimates (h²) for BW6, carcass yield and percentage of carcass moisture were 0.31 ± 0.07, 0.20 ± 0.05 and 0.33 ± 0.07, respectively. The h² for the percentages of protein, fat and ash on a dry matter basis were 0.48 ± 0.09, 0.55 ± 0.10 and 0.36 ± 0.08,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Carcass composition; Genetic correlation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300011

ESTs and putative line-specific (broiler and layer) SNPs identified in genes expressed in Gallus gallus pituitary and hypothalamus
Provedor de dados: 74
Autores: Cassoli,Clarissa Sanches da Silva; Jorge,Erika Cirstina; Patrício,Mateus; Alves,Helena Javiel; Almeida,Erik Amazonas de; Ledur,Mônica Corrêa; Coutinho,Luiz Lehmann.
Brazilian poultry industry has reached a high level of development in both meat and egg production as a result of constant technological modernization. Further improvements can be achieved through genomics, but before this can be accomplished, a better understanding of gene expression profiles and nucleotide polymorphisms is necessary. Since animal physiology is directly or indirectly controlled by the pituitary and hypothalamus, the aim of the present work was to identify and analyze genes expressed in these tissues in chicken lines with different growth potential. Two pituitary and hypothalamus cDNA libraries from 21 day broiler (TT) and layer (CC) chickens lines were constructed and allowed identification of 3,074 unique sequences and 77 single...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pituitary; Hypothalamus; EST; SNP; Chicken.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600008

Estimates of genetic parameters and cluster analyses for carcass and meat quality traits in birds
Provedor de dados: 86
Autores: Bainy,Adriane Molardi; Savegnago,Rodrigo Pelicioni; Freitas,Luara Afonso de; Nunes,Beatriz do Nascimento; Rosa,Jaqueline Oliveira; Ledur,Mônica Corrêa; Munari,Danísio Prado.
Abstract: The objective of this work was to estimate genetic parameters for bird carcass and meat quality traits, as well as to explore the genetic patterns of the breeding values of this population using cluster analyses. Data from 1,846 birds were used to estimate the genetic parameters of production and quality traits using the multiple-trait animal model, and cluster analyses were performed. The heritability estimates ranged from 0.08± 0.03 for meat pH measured 24 hours after slaughter to 0.85± 0.09 for body weight. The genetic correlations between production traits were high and positive. The genetic correlations between meat quality traits were low and were not informative due to the high standard errors (same magnitudes as those of the genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Meat color; White Leghorn.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000300205

Mudanças genéticas em linhas puras de frango de corte
Provedor de dados: 86
Autores: Schmidt,Gilberto Silber; Munari,Danisio Prado; Figueiredo,Elsio Antonio Pereira de; Zanotto,Dirceu Luiz; Ledur,Mônica Corrêa.
O objetivo deste trabalho foi avaliar as mudanças genéticas ocorridas no desempenho, na composição da carcaça e no tamanho e resistência dos ossos, em linhagens experimentais, após seis gerações de seleção. As aves pertenciam às linhas paternas LL, LLc (controle), ZZ e LC1 (comercial), e às maternas PP, PPc (controle), KK e LC2 (comercial). As mudanças genéticas foram obtidas a partir dos desvios entre cada linha selecionada e a respectiva linha controle (LL-LLc e PP-PPc). A seleção para peso corporal resultou em respostas correlacionadas na conversão alimentar, mas não nas características de carcaça. As mudanças genéticas no ganho de peso não estão sendo acompanhadas por mudanças correlacionadas na resistência dos ossos. A ênfase de seleção diferenciada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composição de carcaça; Mudança genética; Seleção.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000400013

Regiões genômicas associadas a características de desempenho e carcaça no cromossomo 5 de linhagens Brasileiras de galinha
Provedor de dados: 86
Autores: Silva,Fernanda Eliza de Jesus; Guido,Luiza Nicolosi; Gazaffi,Rodrigo; Garcia,Antonio Augusto Franco; Ledur,Mônica Corrêa; Coutinho,Luiz Lehmann; Rosário,Millor Fernandes do.
O objetivo deste trabalho foi caracterizar genotipicamente, e construir o mapa de ligação e mapear locos associados a características quantitativas (QTL) de desempenho e carcaça no cromossomo 5 de linhagens brasileiras galinhas. Utilizou-se uma população F2 CTCT, resultante do acasalamento entre machos da linhagem de postura CC e fêmeas da linhagem de corte TT. Um total de 356 animais foi genotipado com 11 marcadores microssatélites. A caracterização genotípica foi realizada pela estimação dos seguintes parâmetros genotípicos: conteúdo de informação polimórfica (0,45-0,69), heterozigosidades observada (0,48-1,00) e esperada (0,48-0,74), e número de alelos por loco (3-5). Empregou-se o mapeamento por intervalo combinado à modelagem fenotípica por modelo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avicultura; Mapeamento por intervalo; Marcadores microssatélites; Locos de características quantitativas.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000300002

Mapping quantitative trait loci in Gallus gallus using principal components
Provedor de dados: 96
Autores: Pinto,Luís Fernando Batista; Packer,Irineu Umberto; Ledur,Mônica Corrêa; Moura,Ana Silvia Alves Meira Tavares; Nones,Kátia; Coutinho,Luiz Lehmann.
This study aimed at mapping QTL (quantitative trait loci) using linear combinations of characteristics of economical interest in Gallus gallus. A total of 350 F2 chickens from an initial crossing among males from a broiler line (TT) with females from a layer line (CC) were used. It was conducted a QTL mapping in chromosomes of Gallus gallus (GGA1, GGA3, GGA5, GGA8, GGA11, and GGA13) for 20 performance and carcass traits. For detecting QTL, it was used the likelihood ratio test between a reduced model (including fixed effects of sex, hatch and random effect of infinitesimal genetic value) and a full model (including all the previous effects plus QTL effects). When original characterists were analyzed, that is, before the formation of linear combinations,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Canonical variables; Chickens; Genome.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100016

Parâmetros genéticos para caracteres de sêmen de aves White Leghorn: 2. Correlações com caracteres de postura
Provedor de dados: 96
Autores: Bongalhardo,Denise Calisto; Dionello,Nelson José Laurino; Ledur,Mônica Corrêa; Rutz,Fernando.
O objetivo do presente trabalho foi estimar correlações genéticas entre caracteres de sêmen (volume de sêmen, motilidade espermática e concentração de espermatozóides) e de postura (produção de ovos, períodos parciais e total, peso médio de ovo) de aves White Leghorn. Para obtenção dos caracteres de sêmen, foram usados 698 machos da linhagem DD1, desenvolvida na EMBRAPA-CNPSA. O sêmen foi coletado às 24, 26 e 28 semanas de idade e, para obtenção dos caracteres de postura, foram usadas suas irmãs inteiras (média de duas irmãs por macho). De acordo com os resultados obtidos, sugere-se que, para a seleção com vistas ao aumento da produção total de ovos (r g = 0,44±0,09) e peso do ovo (r g = 0,67±0,04), seja usado o caráter concentração de espermatozóides,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aves de postura; Correlações genéticas; Produção de ovos; Peso de ovo; Volume de sêmen; Motilidade espermática; Concentração de espermatozóides.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982000000200011

Parâmetros genéticos para caracteres de sêmen de aves White Leghorn.: 1. Herdabilidades e correlações
Provedor de dados: 96
Autores: Bongalhardo,Denise Calisto; Dionello,Nelson José Laurino; Ledur,Mônica Corrêa.
O presente trabalho teve por objetivo estimar herdabilidades (h²) e correlações genéticas (r g) dos caracteres seminais, da motilidade espermática (MOT), do volume de sêmen (VOL) e da concentração de espermatozóides (CON) de aves White Leghorn. Foram utilizados 698 machos White Leghorn da linhagem DD1, desenvolvida na EMBRAPA - CNPSA, com ejaculados coletados às 24, 26 e 28 semanas de idade. As estimativas de herdabilidades e seus erros-padrão, respectivamente, para as 24, 26 e 28 semanas de idade, foram, para VOL, 0,30 (0,18), 0,27(0,17) e 0,32(0,18); para MOT, 0,08(0,16), 0,34(0,18) e 0,26 (0,17); e para CON, 0,29 (0,18), 0,31 (0,17) e 0,34 (0,19). Os valores obtidos para correlações genéticas e seus erros-padrão, às 24 semanas foram: -0,11 (0,56) entre...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Concentração; Correlações genéticas; Herdabilidade; Motilidade; Poedeiras; Sêmen; Volume.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982000000500009

Investigation of Leptin gene in broiler and layer chicken lines
Provedor de dados: 63
Autores: Ninov,Kerli; Ledur,Mônica Corrêa; Alves,Helena Javiel; Rosário,Millor Fernandes do; Nones,Kátia; Coutinho,Luiz Lehmann.
Leptin, a polypeptide hormone secreted mainly by adipose tissue, plays an important role in feed intake regulation, energy metabolism and reproduction in several species. Its function has been intensively studied in mammals; however, in birds limited information is available. The cDNA sequence for chicken leptin has been reported, and high hepatic expression levels of leptin were associated with fat deposition in selected bird lines. However, controversies still remain concerning to the chicken leptin gene and several authors failed to amplify this gene from genomic DNA or cDNA. In view of this controversy and the importance of this gene, the present study aimed to investigate the leptin gene in a population of birds developed by Embrapa Swine and Poultry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallus gallus; Fat deposition; Primer design.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200016

Genetic linkage maps of chicken chromosomes 6, 7, 8, 11 and 13 from a Brazilian resource population
Provedor de dados: 63
Autores: Ambo,Marcel; Campos,Raquel de Lello Rocha; Moura,Ana Sílvia Meira Tavares; Boschiero,Clarissa; Rosário,Millor Fernandes do; Ledur,Mônica Corrêa; Nones,Kátia; Coutinho,Luiz Lehmann.
A linkage map is essential not only for quantitative trait loci (QTL) mapping, but also for the organization and location of genes along the chromosomes. The present study is part of a project whose major objective is, besides from construction the linkage maps, the whole genome scan for mapping QTL for performance traits in the Brazilian experimental chicken population. Linkage maps of chicken chromosomes 6 to 8, 11 and 13 were constructed based on this population. The population was developed from two generations of crossbreeding between a broiler and a layer line. Fifty-one microsatellite markers were tested, from which 28 were informative: 4, 8, 7, 4 and 5 for chromosomes 6, 7, 8, 11 and 13, respectively. A SNP located in the leptin receptor gene was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallus gallus; Quantitative trait loci (QTL); Genetic maps; Microsatellite markers; Animal breeding.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500001

Genetic linkage map of chicken chromosome 1 from a Brazilian resource population
Provedor de dados: 63
Autores: Nones,Kátia; Ledur,Mônica Corrêa; Ruy,Deborah Clea; Baron,Erica Elias; Moura,Ana Silvia Alves Meira Tavares; Coutinho,Luiz Lehmann.
A genetic map provides insight into genome organization and chromosomal location of markers and genes, and is important for quantitative trait loci (QTL) mapping. The objective of this study was to use a Brazilian resource population to construct a linkage map for chicken chromosome 1. Eighty microsatellite markers were tested and 26 informative markers were typed in an experimental F2 population developed by two generations of crossbreeding between a broiler sire line and a layer line. A total of 649 F2 individuals from seven full-sib families with about 95 F2 offspring each were genotyped. Multi-locus linkage analysis resulted in a chromosome 1 map of 26 ordered markers. Locus order was in general agreement with other published linkage maps, except for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellites; Poultry; Mapping.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100003

Strategic marker selection to detect quantitative trait loci in chicken
Provedor de dados: 63
Autores: Ruy,Deborah Clea; Nones,Kátia; Baron,Erica Elias; Ledur,Mônica Corrêa; Melo,Cláudio Manoel Rodrigues de; Ambo,Marcel; Campos,Raquel de Lello Rocha; Coutinho,Luiz Lehmann.
Selective genotyping for a certain trait in individuals with extreme phenotypes contributes sufficient information to determine linkage between molecular markers and quantitative trait loci (QTL). In this experiment an F2 population, developed by crossing males from a broiler line with females from a layer line, was employed to detect QTL on chromosomes 3 and 5. Twenty-eight performance and carcass traits were measured in F2 offspring, and phenotypic correlations between traits were calculated. Body weight at 42 days (BW42) presented the greatest positive correlations with most other traits, with correlation between body weights at 35 and 41 days, weight gain between birth and 35, 41 and 42 days, as well as weights of carcass and some body parts superior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: QTL; Broiler; Selective genotyping; Body weight.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200003

Genotypic characterization of microsatellite markers in broiler and layer selected chicken lines and their reciprocal F1s
Provedor de dados: 63
Autores: Rosário,Millor Fernandes do; Ledur,Mônica Corrêa; Moura,Ana Silvia Alves Meira Tavares; Coutinho,Luiz Lehmann; Garcia,Antonio Augusto Franco.
Chicken experimental populations have been developed worldwide for QTL mapping, but their genotypic characterizations are not usually discussed. The objective of this study was to characterize genotypically two F1 reciprocal generations and their parental lines based on the estimation of genotypic parameters. These F1 generations originated two Brazilian reference populations to map QTL. The evaluated parameters were polymorphic information content (PIC), observed and expected heterozygosities and number of alleles at microsatellite loci on chromosomes 1, 3 and 4. All parental and F1 chickens from both populations were used totalling of 83 chickens: 14 from a broiler (TT) and 14 from a layer line (CC) and 55 from their reciprocal F1 generations. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PIC; Genotypic diversity; Heterozygosity; Number of alleles.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200002

Quantitative differential expression of alpha and beta ryanodine receptor genes in PSE (Pale, Soft, Exudative) meat from two chicken lines: broiler and layer
Provedor de dados: 52
Autores: Oda,Sandra Helena Inoue; Nepomuceno,Alexandre Lima; Ledur,Mônica Corrêa; Oliveira,Maria Cristina Neves de; Marin,Silvana Regina Rockenbach; Ida,Elza Iouko; Shimokomaki,Massami.
Total RNA isolated from Pectoralis major muscle from PSE (L*24h&gt;53.0, pH&lt;5.8) and non-PSE (44&lt;"L*24h&gt;"53) meats of two phenotypically distinct chicken lines, broiler and layer, was used to investigate the α-ryr and β-ryr gene expression by real-time RT-PCR approach. Mean relative quantification (RQ) values were lower (p&lt;0.05) for β-ryr in PSE chickens from both lines when compared to non-PSE chickens, while there was no difference (p&gt;0.05) in α-ryr gene expression regardless of line studied. The β-ryr RQ results suggested that in PSE samples an alteration might occur in the regular ratio (1:1) of α-RyR/β-RyR normally found in avian muscles. These results provided the first evidence of PSE meat occurrence as a result of the differential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malignant hyperthermia; Poultry; Gene expression; Real time PCR.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600024