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Registros recuperados: 25
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Aromatase gene and its effects on growth, reproductive and maternal ability traits in a multibreed sheep population from Brazil Genet. Mol. Biol.
Lôbo,Ana Maria Bezerra Oliveira; Lôbo,Raimundo Nonato Braga; Paiva,Samuel Rezende.
We determined the polymorphism C242T of the aromatase gene (Cyp19) and its allelic frequency, as well as the effect of the variants on productive and reproductive traits in 71 purebred Santa Inês sheep, 13 purebred Brazilian Somali sheep, nine purebred Poll Dorset sheep, and 18 crossbred 1/2 Dorper sheep. The animals were genotyped using the PCR-RFLP technique. The influence of the animal's genotype on its performance or on the performance of its lambs was analyzed by the least square method. Another factor assessed was the importance of the animal's genotype in analysis models for quantitative breeding value estimates, and whether there were differences among the averages of breeding values of animals with different genotypes for this gene. In the sample...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body weight; Lambing interval; PCR-RFLP; Polymorphism; SNP; Litter weight.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300010
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Association between G316A growth hormone polymorphism and economic traits in pigs Genet. Mol. Biol.
Faria,Danielle Assis de; Guimarães,Simone Eliza Facioni; Lopes,Paulo Sávio; Pires,Aldrin Vieira; Paiva,Samuel Rezende; Sollero,Bruna Pena; Wenceslau,Amauri Arias.
The association between G316A growth hormone polymorphism and quantitative traits was investigated in an F2 population of pigs. Association analyses were performed using a statistical model that included genotype, sex, batch and sex by genotype interaction as fixed effects and sire as random effect. The polymorphism was associated with the number of right teats (p = 0.03), heart weight (p = 0.04), lung weight (p = 0.05), carcass length determined by the Brazilian carcass classification method (p = 0.04), picnic shoulder weight (p = 0.07), jowl weight (p = 0.01), pH 24 h after slaughtering (p = 0.03) and drip loss (p = 0.01). Interaction between genotype and sex was observed for six performance traits. The additive effect was significant (p < 0.10) for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Candidate genes; Divergent cross; Molecular marker; Sex x genotype interaction; Swine.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000400010
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Association between insulin-like growth factor I (IGF-I) microsatellite polymorphisms and important economic traits in pigs R. Bras. Zootec.
Faria,Danielle Assis de; Peixoto,Jane de Oliveira; Lopes,Paulo Sávio; Paiva,Samuel Rezende; Silva,Priscila Vendramini; Guimarães,Simone Eliza Facioni.
This study investigated the association between IGF-I microsatellite marker in an F2 population (N=459) generated by mating of native boars to Brazilian commercial sows with performance, carcass cut, and meat quality traits. Association analyses were carried out using a statistical model that included genotype, sex, and group as fixed effects and sire as random effect. The IGF-I genotypes were significantly associated with different quantitative traits and these results corroborate with previous QTL analyses obtained for this chromosome region in swine. Additive and dominance effects, as well as a genotype-sex interaction, were estimated and discussed in the text. According to the results obtained, this marker is suitable for QTL search in the genotyped...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Divergent cross; Microsatellite marker; Quantitative traits; Sex × genotype interaction; Swine.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000200007
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Curvas de crescimento em ovinos da raça morada nova criados no estado da Bahia R. Bras. Zootec.
Souza,Laaina de Andrade; Carneiro,Paulo Luiz Souza; Malhado,Carlos Henrique Mendes; Paiva,Samuel Rezende; Caires,Dirlane Novais; Barreto,Débora Louise Ferreira.
Os objetivos neste estudo foram analisar modelos não-lineares para descrever o crescimento em ovinos da raça Morada Nova criados no estado da Bahia e, após a definição do modelo de melhor ajuste, calcular a taxa de crescimento absoluto e avaliar a influência de fatores ambientais (sexo e tipo de parto) sobre os parâmetros da curva. Utilizaram-se dados de pesagem de 40 ovinos, do nascimento aos 385 dias de idade. Os modelos não-lineares utilizados foram: Brody, Von Bertalanffy, Richards, Logístico e Gompertz. Os modelos Von Bertalanffy, Brody e Richards foram os que apresentaram os melhores ajustes e são equivalentes para explicar o crescimento dos animais. A taxa de crescimento absoluto teve acentuado decréscimo na fase pós-desmama, o que indica a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Efeito ambiental; Modelos não-lineares; Peso à maturidade.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000800011
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Desenvolvimento ponderal e diversidade fenotípica entre cruzamentos de ovinos Dorper com raças locais PAB
Carneiro,Paulo Luiz Souza; Malhado,Carlos Henrique Mendes; Souza Júnior,Antonio Alcione Oliveira de; Silva,Antonio Gonçalves Serafim da; Santos,Fabiana Nery dos; Santos,Pollianna Ferro; Paiva,Samuel Rezende.
O objetivo deste trabalho foi comparar o desenvolvimento ponderal, por meio de curva de crescimento e pesos ajustados e avaliar a diversidade entre ovinos cruzados Dorper com as raças locais, com base em características de carcaça e morfológicas. Foram realizadas pesagens dos animais cruzados em intervalos de aproximadamente 15 dias e avaliados os efeitos de sexo, ano e grupo genético. Na estimativa dos parâmetros das curvas, foi utilizado o modelo não-linear Logístico e, a fim de avaliar o grau de similaridade entre os animais dos grupos genéticos, foram utilizadas variáveis canônicas. O sexo dos animais não influenciou o peso. Houve efeito de ano e grupo genético sobre o desenvolvimento dos animais. Conforme o modelo Logístico para a curva de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ovis aries; Morada Nova; Rabo Largo; Santa Inês; Recursos genéticos animais.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000700011
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Detection and evaluation of selection signatures in sheep PAB
Paim,Tiago do Prado; Ianella,Patrícia; Paiva,Samuel Rezende; Caetano,Alexandre Rodrigues; Pimentel,Concepta Margaret McManus.
Abstract: The recent development of genome-wide single nucleotide polymorphism (SNP) arrays made it possible to carry out several studies with different species. The selection process can increase or reduce allelic (or genic) frequencies at specific loci in the genome, besides dragging neighboring alleles in the chromosome. This way, genomic regions with increased frequencies of specific alleles are formed, caracterizing selection signatures or selective sweeps. The detection of these signatures is important to characterize genetic resources, as well as to identify genes or regions involved in the control and expression of important production and economic traits. Sheep are an important species for theses studies as they are dispersed worldwide and have...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ovis aries; Analysis software; Animal genetic resources; Genetic improvement; Genomics; Molecular genetics; SNP markers.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500527
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D-loop haplotype diversity in Brazilian horse breeds Genet. Mol. Biol.
Ianella,Patrícia; Albuquerque,Maria do Socorro Maués; Paiva,Samuel Rezende; Egito,Andréa Alves do; Almeida,Leonardo Daniel; Sereno,Fabiana T. P. S.; Carvalho,Luiz Felipe Ramos; Mariante,Arthur da Silva; McManus,Concepta Margaret.
Abstract The first horses were brought to Brazil by the colonizers after 1534. Over the centuries, these animals evolved and adapted to local environmental conditions usually unsuitable for exotic breeds, thereby originating locally adapted Brazilian breeds. The present work represents the first description of maternal genetic diversity in these horse breeds based on D-loop sequences. A D-Loop HSV-I fragment of 252 bp, from 141 horses belonging to ten Brazilian breeds / genetic groups (locally adapted and specialized breeds) were analysed. Thirty-five different haplotypes belonging to 18 haplogroups were identified with 33 polymorphic sites. Haplotype diversity (varying from 0.20 to 0.96) and nucleotide diversity (varying from 0.0039 to 0.0239) was lower...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mitochondrial DNA; Genetic characterization; Equus caballus; Locally adapted breeds; Animal genetic resources.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000400604
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Evaluation of conservation program for the Pantaneiro horse in Brazil R. Bras. Zootec.
McManus,Concepta; Santos,Sandra Aparecida; Dallago,Bruno Stéfano Lima; Paiva,Samuel Rezende; Martins,Rafhael Felipe Saraiva; Braccini Neto,José; Marques,Pedro Rocha; Abreu,Urbano Gomes Pinto de.
A genealogical analysis of registered Pantaneiro horses was carried out with 3647 males and 6794 females. Of these animals, 50.66% had identified sires and 48.86% identified dams. The number of pedigrees increased over the generations, with higher registration of parents of sires than dams. Two municipalities are responsible for almost 70% of all registers: i) Poconé (Mato Grosso State), where the headquarters of the breeders association is located and ii) Corumbá (Mato Grosso do Sul State), where EMBRAPA Pantanal conducts its research. The mean inbreeding was 0.04% and average relatedness was 0.13%. Mean generation interval was 8.20 years. There is moderate to high genetic differentiation between farms (15% of total genetic variation) while between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Average relatedness; Effective population size; Farm; Inbreeding; Municipality; Wright's statistics.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000600004
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Genetic characterization of coat color genes in Brazilian Crioula sheep from a conservation nucleus PAB
Cavalcanti,Lilian Cristina Gomes; Moraes,José Carlos Ferrugem; Faria,Danielle Assis de; McManus,Concepta Margaret; Nepomuceno,Alcebiades Renato; Souza,Carlos José Hoff de; Caetano,Alexandre Rodrigues; Paiva,Samuel Rezende.
Abstract: The objective of this work was to identify single nucleotide polymorphisms (SNPs) in resequencing data from MC1R, ASIP, and TYRP1 genes derived from Crioula sheep (Ovis aris) with different coat colors. Polymorphisms in the ASIP (agouti-signaling protein), MC1R (melanocortin 1 receptor), and TRYP1 (tyrosinase-related protein 1) genes were analyzed in 115 sheep from Embrapa’s conservation nucleus of crioula sheep, in Brazil. A total of 7,914 bp were sequenced per animal, and 14 SNPs were identified. Two additional assays were performed to detect duplications and deletions in the ASIP gene. Ninety-five percent of the coat color variation was explained by epistatic interactions observed between specific alleles in the MC1R and ASIP genes. Evidence...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ovis aris; ASIP; Genetic resources conservation; Marker-assisted selection; MC1R; TYRP1.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000800615
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Genetic characterization of the Moxotó goat breed using RAPD markers PAB
Oliveira,Rejane Rodrigues de; Egito,Andréa Alves do; Ribeiro,Maria Norma; Paiva,Samuel Rezende; Albuquerque,Maria do Socorro Maués; Castro,Silvia Ribeiro; Mariante,Arthur da Silva; Adrião,Manuel.
The objective of this study was to verify the genetic diversity between and within seven populations of Moxotó goat (n = 264) from the States of Pernambuco, Paraíba and Rio Grande do Norte, using RAPD (Random Amplified Polymorphic DNA). Moxotó, as well as other naturalized breeds, suffers genetic losses due to the indiscriminate miscegenation with breeds raised in the Northeast Region of Brazil. The genetic characterization of these genetic resources is essential to conservation and breeding programs. DNA was extracted from lymphocytes using a non-organic protocol. The 16 primers used were selected from 120 decamer oligonucleotide primers and generated 56 polymorphic bands. The analysis of molecular variance (AMOVA) showed that the greater part of total...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Capra hircus; Native breeds; Population structure; Conservation genetics.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000300006
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Genetic diversity of captive spotted paca (Agouti paca) from south east Brazil assessed by the RAPD-PCR technique R. Bras. Zootec.
Antunes,Karine Vieira; Machado,Théa Mírian Medeiros; Serão,Nicola Vergara Lopes; Guimarães,Simone Eliza Facione; Paiva,Samuel Rezende.
The genetic diversity was analyzed among spotted paca (Agouti paca) from three commercial flocks located in Brazil. As the genome of this species is unknown, the RAPD-PCR technique was used. Ten primers generated sixty polymorphic bands. The among and within population genetic variability estimated by analysis of molecular variance (AMOVA) was 12.55 and 87.45%, respectively. The shortest Nei distance value was 11.76% among the Carangola (CG) and São Francisco do Glória (SF) populations. This value can be explained by the exchange of reproduction males and females between the two geographically close breeding sites. The analysis of principal components showed well defined and structured groups aggregating animals according their population of origin, with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal conservation; Animal genetic resources; Biodiversity; Genetic distance; Wild animals.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000200006
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Genetic monitoring of a Santa Ines herd using microsatellite markers near or linked to the sheep MHC R. Bras. Zootec.
Petroli,César Daniel; Paiva,Samuel Rezende; Corrêa,Marilma Pachêco Chediak; McManus,Concepta.
This study aimed to analyze genetic diversity in a conservation nucleus of Santa Inês sheep using thirteen microsatellite loci on chromosome 20 (where the Sheep Major Histocompatibility Complex - Ovar-MHC - is found). Seventy three animals from one herd born from 2004 to 2006 were evaluated as a principal nucleus. Seventy one animals from two other herds were used as control comparison. There was a reduction in heterozygosity over the years in relation to the whole population. This may be due to the repeated use of the same sires. The estimates of molecular coancestrality also indicated an increase in genetic similarity between individuals with the herd over the years. A high number of alleles occurred exclusively in the principal nucleus herd, but with a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal genetic resources; Genetic diversity; Ovar-MHC; Ovis aries; Molecular coancestrality; SSR.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000400012
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Genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population Genet. Mol. Biol.
Lôbo,Ana Maria Bezerra Oliveira; Lôbo,Raimundo Nonato Braga; Paiva,Samuel Rezende; Oliveira,Sônia Maria Pinheiro de; Facó,Olivardo.
The genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population were estimated by applying the Average Information Restricted Maximum Likelihood method to an animal model. Data from a flock supported by the Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC) were used. The traits studied included birth weight (BW), weaning weight (WW), slaughter weight (SW), yearling weight (YW), weight gain from birth to weaning (GBW), weight gain from weaning to slaughter (GWS), weight gain from weaning to yearling (GWY), age at first lambing (AFL), lambing interval (LI), gestation length (GL), lambing date (LD - number of days between the start of breeding season and lambing), litter weight at birth (LWB)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age at first lambing; Genetic correlation; Heritability; Body weight; Litter weight.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400016
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Genetic variability of Pantaneiro horse using RAPD-PCR markers R. Bras. Zootec.
Egito,Andréa Alves do; Fuck,Beatriz Helena; McManus,Concepta; Paiva,Samuel Rezende; Albuquerque,Maria do Socorro Maués; Santos,Sandra Aparecida; Abreu,Urbano Gomes Pinto de; Silva,Joaquim Augusto da; Sereno,Fabiana Tavares Pires de Souza; Mariante,Arthur da Silva.
Blood samples were collected from Pantaneiro Horses in five regions of Mato Grosso do Sul and Mato Grosso States. Arabian, Mangalarga Marchador and Thoroughbred were also included to estimate genetic distances and the existing variability among and within these breeds by RAPD-PCR (Random Amplified Polymorphic DNA - Polymerase Chain Reaction) molecular markers. From 146 primers, 13 were chosen for amplification and 44 polymorphic bands were generated. The analysis of molecular variance (AMOVA) indicated that the greatest portion of detected variability was due to differences between individuals within populations (75.47%). Analysis of the genetic variability between pairs of populations presented higher estimates for the five Pantaneiro populations with the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: AMOVA; Arabian; English Thoroughbred; Genetic diversity; Genetic resource; Mangalarga Marchador.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000400007
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Genetic variability of the Brazilian hair sheep breeds PAB
Paiva,Samuel Rezende; Silvério,Vanessa Chaves; Egito,Andréa Alves; McManus,Concepta; Faria,Danielle Assis de; Mariante,Arthur da Silva; Castro,Sílvia Ribeiro; Albuquerque,Maria do Socorro Maués; Dergam,Jorge Abdala.
The objectives of this work were to investigate the genetic structure of the Brazilian hair sheep breeds and to determine the origin of the Santa Inês breed. Molecular similarity was determined using Randomly Amplified Polymorphic DNA - Polymerase Chain Reaction markers in 238 individuals from five naturalized sheep breeds: Santa Inês (48 animals), Rabo Largo (48), Somali (48), Morada Nova (48) and Bergamasca (46), collected in Goiás, Sergipe, Bahia, and Ceará States as well as in the Federal District. Fifty-four loci were selected from 19 primers, after a pilot test using 140 primers. Qualitative analyses indicate diagnostic markers for all breeds. All breeds were significantly different from each other. Interbreed differences were explained by 14.92% of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ovis aries; Conservation genetics; Domestic animal diversity; Molecular markers; RAPD.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000900008
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Genetics and breeding of sheep in Brazil R. Bras. Zootec.
McManus,Concepta; Paiva,Samuel Rezende; Araújo,Ronyere Olegário de.
Studies in genetics and breeding of sheep in Brazil have increased significantly in recent years. These involve research in characterization, breeding and crossing sheep using new technologies available incorporating both classical quantitative and molecular genetics. Improvements in statistical techniques, computational resources as well as analysis of DNA and gaps in present knowledge and opportunities for possible research are pointed out. There is a need for greater interaction between various groups working in the country as well as interactions with other disciplines such as Geographical Information Systems, Statistics, Bioinformatics, as well as biological studies such as physiology and proteomics.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breed; Disease; Heat tolerance; History; Molecular markers; Ovis aries.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300026
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Identification of selection signatures in livestock species Genet. Mol. Biol.
Gouveia,João José de Simoni; Silva,Marcos Vinicius Gualberto Barbosa da; Paiva,Samuel Rezende; Oliveira,Sônia Maria Pinheiro de.
The identification of regions that have undergone selection is one of the principal goals of theoretical and applied evolutionary genetics. Such studies can also provide information about the evolutionary processes involved in shaping genomes, as well as physical and functional information about genes/genomic regions. Domestication followed by breed formation and selection schemes has allowed the formation of very diverse livestock breeds adapted to a wide variety of environments and with special characteristics. The advances in genomics in the last five years have enabled the development of several methods to detect selection signatures and have resulted in the publication of a considerable number of studies involving livestock species. The aims of this...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artificial selection; Domestic animals; Selective sweep.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000300004
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Managing genetic diversity and society needs R. Bras. Zootec.
Mariante,Arthur da Silva; Egito,Andréa Alves; Albuquerque,Maria do Socorro Maués; Paiva,Samuel Rezende; Ramos,Alexandre Floriani.
Most livestock are not indigenous to Brazil. Several animal species were considered domesticated in the pre-colonial period, since the indigenous people manage them as would be typical of European livestock production. For over 500 years there have been periodic introductions resulting in the wide range of genetic diversity that for centuries supported domestic animal production in the country. Even though these naturalized breeds have acquired adaptive traits after centuries of natural selection, they have been gradually replaced by exotic breeds, to such an extent, that today they are in danger of extinction To avoid further loss of this important genetic material, in 1983 Embrapa Genetic Resources and Biotechnology decided to include conservation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal genetic resources; Brazilian conservation program; Genetic variability; Microsatellites.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008001300016
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Morphological measurements and body indices for Cuban Creole goats and their crossbreds R. Bras. Zootec.
Chacón,Edilberto; Macedo,Fernando; Velázquez,Francisco; Paiva,Samuel Rezende; Pineda,Eliecer; McManus,Concepta.
In this work, linear body measures were taken and production indices calculated for 100 Cuban Creole goats and 100 crossbred goats in order to aid in the characterization of animal genetic resources in Cuba. Low variation was found for all indices of the Creole goats, showing homogeneity between the groups of animals studied. Most of the functional indices are related to the milk biotype which is in agreement the possible origin of the breed from animals of the Iberian Peninsula and Canary Islands. The crossbreds were more varied, mostly due to undesigned disorganized crossing. These data may help in identifying a commercial niche for the breed and contribute to in situ conservation of the Cuban Creole goat.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal genetic resources; Capra hircus; Conservation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000800007
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Patterns of genetic diversity of local pig populations in the State of Pernambuco, Brazil R. Bras. Zootec.
Silva,Elizabete Cristina da; Dutra Junior,Wilson Moreira; Ianella,Patrícia; Gomes Filho,Manoel Adrião; Oliveira,Cláudio José Parro de; Ferreira,Débora Nathália de Moura; Caetano,Alexandre Rodrigues; Paiva,Samuel Rezende.
This study estimated the genetic diversity and structure of 12 genetic groups (GG) of locally adapted and specialized pigs in the state of Pernambuco using 22 microsatellite markers. Nine locally adapted breeds (Baé, Caruncho, Canastra, Canastrão, Mamelado, Moura, Nilo, Piau and UDB (Undefined Breed)) and 3 specialized breeds (Duroc, Landrace and Large White), totaling 190 animals, were analyzed. The Analysis of Molecular Variance (AMOVA) showed that 3.2% of the total variation was due to differences between genetic groups, and 3.6% to differences between local and commercial pigs. One hundred and ninety eight alleles were identified and apart from the Large White breed, all GG presented Hardy-Weinberg Equilibrium deviations for some loci. The total and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal genetics resources; Genetic variability; Microsatellites loci; Sus Scrofa.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000800010
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