Molecular and pedigree analysis applied to conservation of animal genetic resources: the case of Brazilian Somali hair sheep

Paiva, Samuel Rezende; Facó, Olivardo; Faria, Danielle Assis de; Lacerda, Thaísa Sant’Anna; Barretto, Gabriel B.; Carneiro, Paulo L. S.; Lôbo, Raimundo Nonato Braga; McManus, Concepta

doi:10.1007/s11250-011-9873-6

Cited by 34 publications

(35 citation statements)

References 34 publications

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“…Em 1991, ocorreu aumento expressivo e abrupto, com valor máximo de 12,22%, e, no período de 1992 a 2010, o F apresentou relativa estabilização, com média de 7,49%. Se admitirmos que valor de F superior a 10% representa risco elevado para ocorrência de depressão por endogamia (Paiva et al, 2011), a raça Santa Inês, com exceção do ano de 1991, apresentou médias anuais dentro de limites satisfatórios. A ausência de endogamia verificada nos primeiros sete anos de formação da raça não foi resultante da inexistência de animais endogâmicos na população, mas sim do número reduzido de ancestrais conhecidos até então, o que impossibilitou a determinação desse parâmetro.…”

Section: Resultsunclassified

“…O estudo da estrutura populacional baseado em informações de pedigree, embora apresente algumas desvantagens, como a baixa integridade ou imprecisão dos dados para animais de produção (Ron et al, 1996), tem sido realizado em diferentes populações ovinas de diversas partes do mundo (Maiwashe & Blackburn, 2004;Goyache et al, 2010;Paiva et al, 2011;Ghafouri-Kesbi, 2012).…”

Section: Introductionunclassified

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Parâmetros populacionais da raça ovina Santa Inês no Brasil

Neto

Cruz²,

Carneiro³

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a estrutura populacional de ovinos da raça Santa Inês criados no Brasil. Foram utilizados dados de pedigree de 13.216 animais, pertencentes a 53 rebanhos de oito estados brasileiros, nascidos no período de 1976 a 2010. O programa Endog foi utilizado para análise do pedigree e estimação dos parâmetros populacionais. Do total de animais estudados, 80,86% apresentaram pedigree na primeira ascendência, 73,78% na segunda e 67,75% na terceira. O número máximo de gerações conhecidas foi de 19, e a média de gerações equivalentes foi de 4,67. A média do intervalo de gerações foi de 3,22±1,77 anos. O tamanho efetivo da população apresentou média de 172,5 animais. O número de animais fundadores foi 829, mas o número efetivo de fundadores foi apenas 50. Os 17 principais ancestrais explicaram 50% da variabilidade genética total. O coeficiente médio de relação foi de 3,87% e o de endogamia, de 6,92%. Apesar do satisfatório coeficiente médio de endogamia nas últimas gerações, este coeficiente requer monitoramento por sua proximidade do limite recomendável. O fluxo de genes entre os rebanhos é o principal fator para o aumento do tamanho efetivo e a manutenção da variabilidade genética da raça Santa Inês.Termos para indexação: ancestrais, endogamia, fundadores, pedigree, variabilidade genética. Population parameters of the sheep breed Santa Inês in BrazilAbstract -The objective of this work was to evaluate the population structure of the sheep breed Santa Inês raised in Brazil. Pedigree data from 13,216 animals, belonging to 53 herds from eight Brazilian states, born between 1976 and 2010, were used. The program Endog was used for pedigree analysis and estimation of population parameters. From the total number of animals studied, 80.86% had a pedigree in the first ascendancy, 73.78% in the second, and 67.75% in the third. The maximum number of known generations was 19, and the average of equivalent generations was 4.67. The average generation interval was 3.22±1.77 years. The mean effective population size was of 172.5 animals. The number of founder animals was 829, but the effective number of founders was only 50. The 17 main ancestors accounted for 50% of the total genetic variability. The average relatedness coefficient was of 3.87% and the average inbreeding coefficient, of 6.92%. Despite the satisfactory average inbreeding coefficient in recent generations, this coefficient requires monitoring because of its proximity to the recommended limit. Gene flow among herds is the main factor for the increase of effective size and the maintenance of genetic variability in the breed Santa Inês.

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Section: Resultsunclassified

Section: Introductionunclassified

Parâmetros populacionais da raça ovina Santa Inês no Brasil

Neto

Cruz²,

Carneiro³

et al. 2013

Pesq. agropec. bras.

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“…This result may be due to the small sample population (15 individuals), and due to the population being consolidated with planned genetic crosses established from breeding programs. Several studies using locally adapted or native breeds confirmed that these breeds have more number of loci in HWE when compared to more specialized breeds (McManus et al, 2010;Paiva et al, 2011a;Tolone et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity of locally adapted sheep from Pantanal region of Mato Grosso do Sul

Crispim¹,

Grisolia²,

Seno³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Sheep of the Pantaneiro breed and seven other breeds, raised in the State of Mato Grosso do Sul, Brazil, were genotyped using eight microsatellite loci. The aim of the present study was to determine the genetic variability, phylogenetic relationship, and patterns of gene introgression and miscegenation among the animals surveyed, to obtain information about the genetic structure of locally adapted sheep in Mato Grosso do Sul. A total of 195 animals were used for genetic analysis. The Pantaneiro breed had the largest average number of alleles/locus (9.25), and higher allelic richness (6.95), while the Dorper population had the lowest values for these parameters (4.88 and 3.86, respectively). Analysis of genetic distance values and genetic structure between populations made it possible to characterize these animals with regard to distinct genetic groups. Average expected heterozygosity ranged from 0.72 (Pantaneiro) to 0.55 (Dorper), while average observed heterozygosity ranged from 0.63 (White Dorper) to 0.54 (Dorper). On the basis of the statistical parameters evaluated, it 5459 ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 12 (4): 5458-5466 (2013) Genetic diversity in Pantaneiro sheep was possible to demonstrate that when compared to other populations, the Pantaneiro breed represented a reservoir of genetic diversity with rare and useful alleles for genetic improvement, emphasizing the importance of preserving the breed.

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“…Knowledge of the population structure combined with information about genetic changes can influence future management actions and can be used to develop strategies for using a breed in a particular ecosystem as a model for genetic improvement programs [41]. Conservation programs using molecular tools are crucial for the providing information about the genetic diversity of locally adapted groups, thus allowing them to be included in production systems for integration of adaptation and rusticity features [12].…”

Section: Phylogeny and Population Structurementioning

confidence: 99%

Naturalized Breeds in Brazil: Reports on the Origin and Genetic Diversity of the Pantaneiro Sheep

Crispim¹,

Banari²,

Oliveira³

et al. 2017

Livestock Science

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Brazil has several breeds of sheep, including animals that developed from breeds brought by settlers soon after their discovery. Over the years, these animals were under the process of natural selection, resulting in breeds that are considered naturalized. The Pantaneiro sheep shows rusticity and ability of adaptation to tropical climate regions and tolerance or resistance to disease and parasites. Molecular tools have marked the discovery of the origin and domestication processes of a wide variety of species, using both nuclear and mitochondrial molecular markers. These tools have aided in the understanding of evolutionary relationships, taxonomies, and demographics of various species and provided support to identify the most important areas for conservation programs, in addition to assisting in the analysis of genetic diversity in domestic, wildlife and endangered species. Researches using these tools show the importance of exploiting the potential of the genetic diversity found in locally adapted livestock. So far, a few studies were performed to observe that Pantaneiro sheep served as maternal basis for the origin of other breeds reared. Moreover, it is possible to suggest an European origin for the sheep populations studied; therefore, more studies using more markers are needed, so that it is possible to prove their origin.

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Molecular and pedigree analysis applied to conservation of animal genetic resources: the case of Brazilian Somali hair sheep

Cited by 34 publications

References 34 publications

Parâmetros populacionais da raça ovina Santa Inês no Brasil

Parâmetros populacionais da raça ovina Santa Inês no Brasil

Genetic diversity of locally adapted sheep from Pantanal region of Mato Grosso do Sul

Naturalized Breeds in Brazil: Reports on the Origin and Genetic Diversity of the Pantaneiro Sheep

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