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. 2024 Mar 21;14(6):975.
doi: 10.3390/ani14060975.

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

Ripfumelo Success Mabunda  1   2 , Khathutshelo Agree Nephawe  1 , Bohani Mtileni  1 , Mahlako Linah Makgahlela  2   3
Affiliations

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

Ripfumelo Success Mabunda et al. Animals (Basel). .

Abstract

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.

Keywords: genetic contribution; genetic diversity; inbreeding; influential ancestors.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Pedigree completeness as determined with the EqGs for the years 1971 to 2019.
Figure 2
Figure 2
Average inbreeding coefficient by year of birth in the Boerboel dog breed.
Figure 3
Figure 3
The cumulative genetic variation explained by the reference population’s most important ancestors (birth years: 2009–2019) for males and females.
See this image and copyright information in PMC

References

    1. Swart S. Canis Africanis. Brill; Leiden, The Netherlands: 2008. Dogs and dogma: A discussion of the socio-political construction of Southern African dog ‘breeds’ as a window onto social history; pp. 267–287.
    1. Van Sittert L., Swart S. Canis Africanis. Brill; Leiden, The Netherlands: 2008. Canis familiaris: A dog history of Southern Africa; pp. 1–34.
    1. Van Sittert L., Swart S. Canis familiaris: A dog history of South Africa. S. Afr. Hist. J. 2003;48:138–173. doi: 10.1080/02582470308671929. - DOI
    1. South African Boerboel Breeders’ Society (SABBS) Boerboel Breed Standard. 2019. [(accessed on 25 April 2021)]. Available online: https://sabbs.org/the-boerboel/breed-standard.
    1. Kennel Union of Southern Africa (KUSA) Breed Standard. 2008. [(accessed on 2 February 2023)]. Available online: https://www.kusa.co.za/index.php/documents/breed-standards/working-group....

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