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

Muniz, Lorena Mirelle Santos; Souza, Lara Andrade; Barbosa, Artur Felipe Santos; Ambrosini, Diego Pagung; Oliveira, Ana Paula; Carneiro, Paulo Luız Souza; Malhado, Carlos Henrıque Mendes; Filho, Raimundo Martins; Duarte, Raquel

doi:10.1590/s0102-09352012000600035

Cited by 3 publications

(2 citation statements)

References 17 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The low level of inbreeding estimates observed in the herd can be a consequence of the small number of generations analyzed (~3) in addition to the reproductive processes conducted to avoid in the bovine breed. These data are similar to those found by Muniz et al (2012), that assessing the population structure of bovine’s breed, Gir Mocha, estimated the levels of endogamy evaluated by the pedigree of animals [24]. The result was zero from 1954 to 1984, and between the years of 1985 to 1997, were found values of F x below 1%, indicating little loss of genetic variability.…”

Section: Discussionsupporting

confidence: 88%

Genetic Characterization of Indubrasil Cattle Breed Population

Zanella

Lago

Silva

et al. 2018

Veterinary Sciences

View full text Add to dashboard Cite

The Indubrasil breed was developed in the Brazilian region called Triângulo Mineiro as a result of a cross between zebu cattle. Initially, it was used as a terminal cross and currently it represents approximately 4.45% of all the Brazilian zebu cattle. Studies were conducted to estimate genetic parameters in the Indubrasil using pedigree information, however, until now, no study has been developed using large-scale genomic markers in this breed. Pedigree information are widely used to investigate population parameters; however, they can neglect some estimates when compared to the use of genomic markers. Therefore, the objective of this study was to investigate the population structure and the genetic diversity of Indubrasil cattle using a high-density Single Nucleotide Polymorphism (SNP) panel (Illumina BovineHD BeadChip 700k). Levels of genomic homozygosity were evaluated using three different approaches: Runs of homozygosity (FROH), % of homozygosis (FSNP), and inbreeding coefficient (Fx). Further, Runs of Homozygosity (ROH) segments conserved among the animals were investigated to identify possible regions associated with the breed characteristics. Our results indicate that even the Indubrasil breed having a small effective population size, the levels of homozygosity (FROH = 0.046) are still small. This was possibly caused by the cross conducted among different breeds for its development. It suggests no immediate risks associated with loss of genetic variation. This information might be used in breeding programs, for the breed conservation and for the expansion of the Indubrasil breed.

show abstract

Section: Discussionsupporting

confidence: 88%

Genetic Characterization of Indubrasil Cattle Breed Population

Zanella

Lago

Silva

et al. 2018

Veterinary Sciences

View full text Add to dashboard Cite

show abstract

“…Esses números sugerem menor risco de elevação da endogamia que aqueles relatados em ovinos da raça Mallorquina, cujo número efetivo de rebanhos que forneceram reprodutores para as três primeiras gerações representou 18,72, 8,09 e 7,87% do número total de rebanhos (Goyache et al, 2010). O desejável é que o número efetivo de rebanhos seja mais próximo do número real, uma vez que um baixo número efetivo de rebanhos pode levar, a médio e longo prazo, ao aumento da endogamia e à redução do tamanho efetivo da população (Muniz et al, 2012).…”

Section: Resultsunclassified

Parâmetros populacionais da raça ovina Santa Inês no Brasil

Neto

Cruz²,

Carneiro³

et al. 2013

Pesq. agropec. bras.

View full text Add to dashboard Cite

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.

show abstract

Analysis of the population structure of a cattle conservation nucleus Curraleiro Pé Duro

Ribeiro

Medeiros

Nascimento

et al. 2021

Arq. Bras. Med. Vet. Zootec.

View full text Add to dashboard Cite

The objective of this research was to study the population structure of the Cattle Conservation Nucleos Curraleiro Pé Duro of the Instituto Nacional do Semiárido (NCP_INSA) based on pedigree data. Genealogical information from 338 animals registered in the period from 1991 to 2019 was used. The number of founding animals (Nf), the effective number of founders (fe), effective number of ancestors (fa), inbreeding coefficient (F), and average relatedness coefficient (AR), in addition to Fis, Fit and Fst were estimated. It was possible to identify ancestors up to the third generation, with an increase in information over the generations. Of the total pedigree information evaluated, 90.53% had the identification of the father and mother. The effective size of the population was smaller than those proposed by FAO, suggesting the need to redefine the herd management and genetic management plan strategies, promoting gene flow and breed expansion.

show abstract

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

Cited by 3 publications

References 17 publications

Genetic Characterization of Indubrasil Cattle Breed Population

Genetic Characterization of Indubrasil Cattle Breed Population

Parâmetros populacionais da raça ovina Santa Inês no Brasil

Analysis of the population structure of a cattle conservation nucleus Curraleiro Pé Duro

Contact Info

Product

Resources

About