Genetic parameters for traits associated with resistance to Haemonchus contortus in a South African Dohne Merino sheep flock

Snyman, M.A.; Fisher, A.D.

doi:10.1016/j.smallrumres.2019.01.004

Cited by 21 publications

(18 citation statements)

References 56 publications

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“…Merino and Merino-derived breeds have been widely distributed across the world as pure and admixed populations (Ciani et al 2015). Merinos were introduced into South Africa from Spain and have become adapted to South African climatic conditions (Snyman & Fisher, 2019). Ciani et al (2015) suggested a more recent Merino-mediated gene flow to several Merinoderived breeds and populations.…”

Section: Discussionmentioning

confidence: 99%

“…2015). Merinos were introduced into South Africa from Spain and have become adapted to South African climatic conditions (Snyman & Fisher, 2019). Ciani et al (2015) suggested a more recent Merino‐mediated gene flow to several Merino‐derived breeds and populations.…”

Section: Discussionmentioning

confidence: 99%

“…Development of the Namaqua Afrikaner occurred as a result of natural selection and as this breed fell into commercial obscurity during the 1930s, no selective breeding for the enhancement of commercially valuable attributes (i.e. meat production yield and quality) occurred (Snyman & Fisher 2019). The most prominent feature of the Namaqua Afrikaner is its fat tail, an adaptive trait to offset nutritional needs in times of drought and forage scarcity.…”

Section: Discussionmentioning

confidence: 99%

“…This was quite interesting as Dohne Merino were established as a breed and predominantly raised in a H. corntortus ‐challenged environment in the Eastern Cape province of South Africa (Dlamini et al . 2019; Synman & Fisher 2019). Other SNPs differentiating the Dohne Merino from the other Merinos were associated with body weight, wool crimp, ear size and carcass fat percentage.…”

Section: Discussionmentioning

confidence: 99%

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The genomic architecture of South African mutton, pelt, dual‐purpose and nondescript sheep breeds relative to global sheep populations

et al. 2020

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South Africa has a diverse array of phenotypically distinct and locally adapted sheep breeds that have been developed for different production systems ranging from mutton to wool and pelt, and some dual-purpose and nondescript breeds kept by smallholder farmers. This study investigated genetic diversity, population genetic structure and divergence between South African sheep breeds in order to gain an insight into breed history and genomic architecture aligned to breeding goals and production systems. The Illumina OvineSNP50 BeadChip was used to genotype 400 sheep belonging to 14 breeds representing mutton, pelt and mutton and wool dual-purpose breeds. Nguni sheep were included as a representative of indigenous nondescript breeds that are reared by smallholder farmers. Seeking a clearer understanding of the genetic diversity of South African breeds relative to global populations, 623 genotypes of sheep from worldwide populations were included in the analysis. These sheep breeds included six African, two Asian and eight European breeds. Across breeds, genetic diversity ranged from observed heterozygosity (H 0) = 0.26 AE 0.02 in Namaqua Afrikaner to H 0 = 0.38 AE 0.01 in Dohne Merino. The overall mean H 0 was 0.35 AE 0.04. The African and Asian populations were the most inbred populations with F IS ranging from 0.17 AE 0.05 in Grey Swakara and Ronderib Afrikaner sheep to 0.34 AE 0.07 in the Namaqua Afrikaner. The South African Dohne Merino (F IS = 0.03 AE 0.01), SA Merino (F IS = 0.05 AE 0.04) and Afrino (F IS = 0.09 AE 0.02) and other global Merino-derived breeds were the least inbred. The first principal component explained 27.7% of the variation and separated the fat-and rump-tailed sheep (i.e. Swakara, Nguni, Blackhead Persian, Ethiopian Menzi, Meatmaster) from the Merino and Merino-derived breeds and the Dorset Horn. The second principal component separated the Merino and Merino-derived breeds from the English breed of Dorset Horn. Overall, South African indigenous breeds clustered together with indigenous breeds from other African and Asian countries. The optimal ADMIXTURE cluster (K = 20) revealed various sources of within-and amongst-breed genomic variation associated with production purpose, adaptation and history of the breeds. The Blackhead Persian, Nguni and Namaqua Afrikaner breeds differed significantly from other breeds, particularly with the South African Mutton Merino and Dorset Horn. Breed-differentiating SNPs were observed within genomic regions associated with growth, adaptation and reproduction. Genes such as RAB44, associated with growth and meat/carcass traits, differentiated the Blackhead Persian from the Dorset Horn and South African Mutton Merino. The MAP2 and HRAS genes, which are associated with immune traits involving Toll-like receptors and Chemokine signalling pathways, differentiated the Nguni from the Dorset Horn. The current results give insight into the current status of the sheep genetic resources of South Africa relative to the global sheep population, highlighting both genetic

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The genomic architecture of South African mutton, pelt, dual‐purpose and nondescript sheep breeds relative to global sheep populations

et al. 2020

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“…As principais medidas quantitativas utilizadas para a identifi cação de ovinos resistentes ou susceptíveis são a contagem de ovos por gramas de fezes, volume globular, escore FAMACHA (grau de anemia) e escore de condição corporal (SNYMAN;FISHER, 2019). Essas medidas são características que apresentam variabilidade genética adequada para responderem à seleção e serem incluídas em programas de melhoramento genético (AMARILHO-SILVEIRA et al, 2015;SNYMAN;FISHER, 2019).…”

Section: Diagnóstico E Controle Da Resistência à Verminose Em Ovinosunclassified

Avaliação Seminal Em Carneiros Da Raça Santa Inês E Mestiços (Santa Inês X Dorper) Submetidos À Insulação Escrotal

Júnior¹,

Neto²,

Silva³

et al. 2020

Estudos Em Zootecnia E Ciência Animal

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Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.

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Comparison of genetic parameters and estimated breeding values for worm resistance in meat sheep obtained using traditional and genomic models

Santos

Santos²,

Filho

et al. 2021

Trop Anim Health Prod

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Genetic parameters for traits associated with resistance to Haemonchus contortus in a South African Dohne Merino sheep flock

Cited by 21 publications

References 56 publications

The genomic architecture of South African mutton, pelt, dual‐purpose and nondescript sheep breeds relative to global sheep populations

The genomic architecture of South African mutton, pelt, dual‐purpose and nondescript sheep breeds relative to global sheep populations

Avaliação Seminal Em Carneiros Da Raça Santa Inês E Mestiços (Santa Inês X Dorper) Submetidos À Insulação Escrotal

Comparison of genetic parameters and estimated breeding values for worm resistance in meat sheep obtained using traditional and genomic models

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