Structure and genetic variability of the Mexican Sardo Negro breed

Domínguez-Viveros, Joel; Reyes-Cerón, Antonio; Saiz-Pineda, Juan Fernando; Villegas-Gutiérrez, Cesar; Aguilar-Palma, Guadalupe Nelson; Rodríguez-Almeida, Felipe Alonso

doi:10.1590/0103-8478cr20210116

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…In this study, male ancestors contributed 10.67% to the total genetic variation, which was similar to the findings of Brito et al [ 58 ] and Sölkner et al [ 59 ] for Austrian Braunvieh, Pinzgauer, and Grauvier cattle populations, where an influential ancestor contributed close to 10% to the total genetic variation. As a result, higher inbreeding levels are associated with low numbers of ancestors explaining high levels of genetic variability in a population [ 60 ]. A reasonable strategy for achieving maximum long-term genetic diversity according to Navas et al [ 40 ] is to divide the population into as many different groups as possible.…”

Section: Discussionmentioning

confidence: 99%

Pedigree-Based Genetic Diversity in the South African Boerboel Dog Breed

Mabunda,

Nephawe,

Mtileni

et al. 2024

Animals

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The Boerboel dog breed (BBD) is indigenous to South Africa (SA) and plays an important role in safeguarding homes and farms. The Department of Agriculture, Land Reform, and Rural Development (DALRRD) classifies the BBD as a protected species, and it is valued for its intelligence, boldness, and strength, as well as for continually ensuring the safety of its owners. The aim of this study was to investigate genetic diversity within the BBD population using pedigree information. The original BBD data, which contained 87,808 records, were obtained from the Integrated Registration and Genetic Information System (INTERGIS). After editing, the pedigree data included 87,755 records of animals born between 1971 and 2019. Pedigree analyses were performed using PEDIG (Fortran 77 software) to determine the completeness, inbreeding coefficients, and genetic diversity as defined by the genetic contributions of the most important ancestors of the current animals. This study identified 91.2% inbred animals in the BBD population, with an average and maximum inbreeding of 7.5% and 50% of inbred animals, respectively. The estimated inbreeding rate per year was 0.20% with an effective population size of 83.1. The most influential ancestors explained 82.63% and 80.92% of the total genetic variation for males and females in the studied populations, respectively. Only 10 important ancestors explained more than 50% of the entire population’s genetic diversity. The numbers of founders (f) were 348 and 356, and the effective numbers of founders (fe) were 57.4 and 60.1, respectively, for males and females. The numbers of founders were higher than the effective numbers of founders, implying a loss of genetic diversity due to unequal founder contributions. The BBD population was not critically endangered based on the inbreeding rates and effective population size; however, the population experienced a significant loss of genetic variability, unequal genetic contributions by founders, and a genetic bottleneck. Future breeding strategies could benefit from using equal proportions of parent stock and including new genetically distant breeds.

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Section: Discussionmentioning

confidence: 99%

Pedigree-Based Genetic Diversity in the South African Boerboel Dog Breed

Mabunda,

Nephawe,

Mtileni

et al. 2024

Animals

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Genome-wide assessment of genetic diversity in Mexican Sardo Negro breed

et al. 2023

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Genealogical information analysis of Gyr and Nelore cattle from Costa Rica

Castro-Vásquez,

Vásquez-Loaiza,

Cruz-Méndez

et al. 2023

Cienc. Rural

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The objectives were to analyze the genealogical information of Gyr (GY) and Nelore (NL) cattle from Costa Rica. Analyzed: pedigree integrity (GY, 13272; NL, 18153); number of complete, maximum traced and equivalent complete generations; inbreeding (FI); generation interval (GI) through four selection routes; average additive genetic ratio (AGR); effective number of founders (fe); effective number of ancestors (fa); effective population size (Ne). The analysis was performed with the ENDOG software. The maximum proportion of unknown parents, grandparents, and great-grandparents was 18.6%, 39.9%, and 59.3%, respectively. The average FI for NL was 8.87% and 2.85% in GY. The average consanguineous population (%) and FI was 53.9 and 16.5% in NL, 28.9 and 9.9% in GY. The average and maximum values of AGR for NL were 3.5 and 12.8, 1.4 and 5.6 in GY. The fe and fa for NL were 65.0 and 38.0, in GY 145.7 and 59.0. The Ne indicated increases in FI in the range of 1 to 2% in GY, for NL greater than 2%, with a status of care to monitor the evolution of F and AGR and their possible implications in genetic improvement. The GI ranged from 6.3 to 7.9 years with a general average of 6.9 years. These results show a summary of the genetic and reproductive management those breeders have carried out.

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Structure and genetic variability of the Mexican Sardo Negro breed

Cited by 3 publications

References 22 publications

Pedigree-Based Genetic Diversity in the South African Boerboel Dog Breed

Pedigree-Based Genetic Diversity in the South African Boerboel Dog Breed

Genome-wide assessment of genetic diversity in Mexican Sardo Negro breed

Genealogical information analysis of Gyr and Nelore cattle from Costa Rica

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