History of registered Gyr breed in Brazilian Northeast: population structure and genetic improvement of growth traits

Malhado, Carlos Henrıque Mendes; Carneiro, Paulo Luız Souza; Malhado, Ana C. M.; Martins, Jorge André Matias; Filho, Raimundo Martins; Bozzi, Rıccardo

doi:10.1590/s0103-84782010000600023

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…The average generation interval was equal to that calculated by Faria et al (2009), slightly lower than those reported by Malhado et al (2008a;, and higher than the intervals observed by Carneiro et al (2009) and Malhado et al (2010) for registered zebu cattle in Brazil.…”

Section: Resultscontrasting

confidence: 66%

“…These methods have provided significant insights into the genetic structure of economically profitable species. Despite these advances, there is still a need for information about pedigree, in order to identify temporal trends and to evaluate inbreeding, effective population size, generation interval, genetic diversity and several other important population parameters (Vercesi Filho et al, 2002, Malhado et al, 2008a, 2008b, 2010Martinez et al, 2008;Faria et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Genetic improvement and population structure of the Nelore breed in Northern Brazil

Malhado

Carneiro

Malhado

et al. 2010

Pesq. agropec. bras.

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-The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.Index terms: Bos taurus indicus, effective population size, genetic parameters, genetic trends, inbreeding, pedigree analysis. Melhoramento genético e estrutura populacional da Raça Nelore na Região Norte do BrasilResumo -O objetivo deste trabalho foi avaliar a estrutura populacional e o progresso genético e fenotípico da raça Nelore na Região Norte do Brasil. Informações sobre o pedigree foram analisadas em animais nascidos entre 1942 e 2006. A estrutura populacional foi estimada utilizando-se o programa Endog. Dos 140.628 animais avaliados, 67,7% dos pais, 14,52% dos avós e 3,18% dos bisavós eram conhecidos. O coeficiente de parentesco médio e a endogamia foram, em geral, baixos: 0,13 e 0,20%, respectivamente. Contudo, esses parâmetros podem ter sido subestimados, já que as informações de pedigree eram incompletas. O número efetivo de fundadores foi de 370 e a variabilidade genética na população explicada pelos 10, 50 e 448 mais influentes ancestrais foi de 13,2, 28 e 50%, respectivamente. A existência de variabilidade genética indica possibilidade de aumento na produtividade por meio da seleção. Adicionalmente, estratégias de manejo para diminuir a idade ao primeiro parto e o intervalo de gerações são importantes para o melhoramento da raça.Termos para indexação: Bos taurus indicus, tamanho efetivo da população, parâmetros genéticos, tendência genética, endogamia, análise de pedigree.

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Section: Resultscontrasting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Genetic improvement and population structure of the Nelore breed in Northern Brazil

Malhado

Carneiro

Malhado

et al. 2010

Pesq. agropec. bras.

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“…Moreover, the absorption of characteristics from meat line (Standard Gyr) by Dairy Gyr may have generated more genetic variability (Leão et al, 2013;Reis Filho et al, 2010). Several studies on structure of populations showed reductions of effective population and increases in inbreeding among Gyr animals (Malhado et al, 2010;Faria et al, 2009). Tabapuã breed had a mixing pattern, with contribution of other ancestor groups.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity, population structure, and correlations between locally adapted zebu and taurine breeds in Brazil using SNP markers

Campos

Carmo

Egito

et al. 2017

Trop Anim Health Prod

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Genetic diversity is one of the most important issues in studies on conservation of cattle breeds and endangered species. The objective of this study was to estimate the levels of genetic differentiation between locally adapted taurine (Bos taurus taurus) and zebu (Bos taurus indicus) breeds in Brazil, which were genotyped for more than 777,000 SNPs. The fixation index (F ), principal component analysis (PCA), and Bayesian clustering were estimated. The F highlighted genetic differentiation between taurine and zebu breeds. The taurine lines, Caracu and Caracu Caldeano, had significant genetic differentiation (F close to 5%) despite their recent selection for different uses (meat and milk). This genetic variability can be used for conservation of locally adapted animals, as well as for breeding programs on zebu breeds. Introgression of zebu in locally adapted breeds was identified, especially in Curraleiro Pé-Duro breed. The Gyr breed, however, had low breed purity at genomic level due to its very heterogeneous mixing pattern.

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“…É importante salientar que o sucesso de programas de melhoramento genético é extremamente dependente do conhecimento dos vários fatores que podem interferir na seleção, como tamanho efetivo, intervalo de gerações e variabilidade genética (Malhado et al, 2008). O rebanho da raça Gir Mocha é relativamente pequeno, e estudos da sua estrutura genética populacional são escassos, especialmente na região Nordeste.…”

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A raça Gir Mocha na região Nordeste do Brasil: estrutura genética populacional via análise de pedigree

Muniz¹,

Souza²,

Barbosa³

et al. 2012

Arq. Bras. Med. Vet. Zootec.

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History of registered Gyr breed in Brazilian Northeast: population structure and genetic improvement of growth traits

Abstract: This paper provides an evaluation of the population

Cited by 10 publications

References 14 publications

Genetic improvement and population structure of the Nelore breed in Northern Brazil

Genetic improvement and population structure of the Nelore breed in Northern Brazil

Genetic diversity, population structure, and correlations between locally adapted zebu and taurine breeds in Brazil using SNP markers

A raça Gir Mocha na região Nordeste do Brasil: estrutura genética populacional via análise de pedigree

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