Genetic diversity evolution of a sheep breed reintroduced after extinction: Tracing back Christopher Columbus' first imported sheep

Arias, David Casanovas; Jurado, José Manuel León; Asensio, Luis Alberto Bermejo; González, Francisco Javier Navas; Navas, Carmen Marín; Capote, Cecilio Barba

doi:10.1016/j.rvsc.2020.06.007

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…The Nei distances show similarity at the herd and municipality levels (378 and 253, respectively) but considerable distance at the provincial level (10). Clade formation in Figures 7 and 8 reveals distinct groupings: Cadiz and Jaen (0.047 and 0.016, respectively) and a third split into Sevilla and Cordoba-Huelva (0.010, 0.007, and 0.007, respectively).…”

Section: Discussionmentioning

confidence: 94%

“…Subsequently, calculations related to genetic diversity, probabilities of gene origin, and founder analyses can only be conducted either by solely considering animals with both parents known or by comparing them to the historical and current datasets, as suggested by Casanovas Arias et al [10] and Navas et al [11]. As a result, a third dataset was considered (reference population).…”

Section: Pedigree Database and Software Toolmentioning

confidence: 99%

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Analysis of Endangered Andalusian Black Cattle (Negra Andaluza) Reveals Genetic Reservoir for Bovine Black Trunk

Cartuche Macas,

Camacho Vallejo,

González Ariza

et al. 2024

Animals

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This comprehensive study on the Andalusian Black cattle breed reveals a substantial population decline, with the average herd size decreasing significantly from 305.54 to 88.28 animals per herd. This decline is primarily attributed to agricultural changes and the introduction of foreign meat-focused breeds. The male-to-female ratio shift is noteworthy, with more cows than bulls, impacting selection intensity for both genders. Inbreeding levels, though relatively low historically (5.94%) and currently (7.23%), raise concerns as 37.08% historically and 48.82% currently of the animals exhibit inbreeding. Positive assortative mating is evident, reflected by the increasing non-random mating coefficient (α). Key ancestors play a crucial role in shaping genetic diversity, with one ancestor significantly influencing the current genetic pool and the top 10 ancestors contributing substantially. Breed maintains a conservation index of 2.75, indicating relatively high genetic diversity. Recent conservation efforts have led to an increase in registered animals. The Cañadas Reales, historical transhumance routes, may have contributed to genetic connections among provinces. Challenges include the historical bottleneck, demographic changes, and potential impacts from reproductive practices. The Andalusian Black breed’s conservation necessitates ongoing efforts in genealogical registration, targeted breeding programs, and collaborative initiatives to address the observed demographic shifts and ensure sustainable genetic diversity.

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Section: Discussionmentioning

confidence: 94%

Section: Pedigree Database and Software Toolmentioning

confidence: 99%

Analysis of Endangered Andalusian Black Cattle (Negra Andaluza) Reveals Genetic Reservoir for Bovine Black Trunk

Cartuche Macas,

Camacho Vallejo,

González Ariza

et al. 2024

Animals

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Process of Introduction of Australian Braford Cattle to South America: Configuration of Population Structure and Genetic Diversity Evolution

González

Crudeli

et al. 2022

Animals

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This study analyzes the evolution of the population structure and genetic diversity of Braford cattle in South America from 1949 to 2019 to suggest effective strategies for breeding in the future. The percentage of bulls historically increased. The average generational interval decreased to 11.78 years for the current population. Average inbreeding (F) and coancestry (C) are low and show a historically increasing trend (0.001% to 0.002%, respectively). The degree of nonrandom mating (α) increased from −0.0001 to 0.0001 denoting a change in the trend to mate similar individuals. The average relatedness coefficient (ΔR) increased in the current period from 0.002% to 0.004%. A single ancestor explained 4.55% to 7.22% of the population’s gene pool. While the effective population size based on the individual inbreeding rate (NeFi) was 462.963, when based on the individual coancestry rate (NeCi), it was 420.168. Genetic diversity loss is small and mainly ascribed to bottlenecks (0.12%) and to unequal contributions of the founders (0.02%). Even if adequate levels of diversity can be found, practices that consider the overuse of individual bulls (conditioned by nature or not), could lead to a long-term reduction in diversity. The present results permit tailoring genetic management strategies that are perfectly adapted to the needs that the population demands internationally.

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Genetic diversity evolution of a sheep breed reintroduced after extinction: Tracing back Christopher Columbus' first imported sheep

Cited by 2 publications

References 35 publications

Analysis of Endangered Andalusian Black Cattle (Negra Andaluza) Reveals Genetic Reservoir for Bovine Black Trunk

Analysis of Endangered Andalusian Black Cattle (Negra Andaluza) Reveals Genetic Reservoir for Bovine Black Trunk

Process of Introduction of Australian Braford Cattle to South America: Configuration of Population Structure and Genetic Diversity Evolution

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