Studies on the Genetic Relationships of Sheep Populations from East and South of Central Asia

Sun, Weibang; Chang, Hong; Yang, Zhangping; Geng, Rong; Lu, S. X.; Chang, G. B.; Xu, Wenjuan; Wang, H. Y.; Ren, Zhanjun; Tsunoda, Kenji

doi:10.5713/ajas.2002.1398

Cited by 13 publications

(12 citation statements)

References 3 publications

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“…Conversely, selection for homozygotes can inflate the F value. Historical evidence indicates that both large-scale migrations and selection could have affected these breeds (Sun et al 2003a), which is supported by our finding that over one third of markers significantly departed from neutrality. Although presumably neutral, microsatellite loci can be linked to functional genes.…”

Section: Discussionsupporting

confidence: 79%

“…Per Tsunoda's classification, the indigenous breeds in the study belong to the Mongolian or Tibetan groups, but the results from this study are not in good agreement with Tsunoda's classification. Based on several investigations (Zheng 1988; this study) and historical evidence (Sun et al 2003b), it is believed that TY belongs to the Mongolian group and may also be related to Large-(Fat)-Tail Han. The ancestors of Large-(Fat)-Tail Han were perhaps the Fat-Tail sheep in Middle East and Near East and they were brought to Xinjiang, Gansu and Shaanxi provinces of China along the 'Silk Road' through trade and migrations.…”

Section: Discussionmentioning

confidence: 95%

“…We also included an improved Mongolia breed (Inner Mongolian Wool, NE) that had genetic contributions from the local breeds, Soviet Merino and Australian Merino in its breeding history. Yet, the origin(s) of a studied breed (HZ) remains controversial, based on the previous studies of its morphological data, physiological characteristics and historical evidence (Sun et al 2003b).…”

Section: Subject Recruitment and Geographic Distributionmentioning

confidence: 99%

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Phylogeography and Origin of Sheep Breeds in Northern China

Rao

Shen-jin

et al. 2006

Conserv Genet

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With the establishment of modern sheep production systems in China, various forms of hybridization with Western breeds and between native breeds have been utilized for genetic improvement. At the same time, the progressive destruction or deterioration of sheep habitat has accompanied urbanization in China. Together these factors have accelerated the loss of genetic diversity, or even resulted in the extinction of some indigenous breeds. It is therefore important that efficient strategies for surveillance, evaluation, conservation and utilization of available genetic resources are developed for this species. In this study, a total of 30 microsatellite markers were used to assess genetic diversity for 12 native breeds and one Western sheep breed in Northern China. The high polymorphism information contents at the 30 markers, varying from averages of 0.519 to 0.666 for the 13 breeds, imply the retention of natural variation from source populations in the domestic breeds from different geographic regions in China. Analysis of genetic differentiation revealed substantial divergence among these breeds. Neutrality tests indicated that more than one third of the 30 loci were in departure from neutrality, implying that some evolutionary forces (e.g. selection and migration) had acted on these populations. Phylogenetic and phylogeographic analyses displayed a remarkable degree of consistency between geographic origins, breeding histories and the pattern of genetic differentiation.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 95%

Section: Subject Recruitment and Geographic Distributionmentioning

confidence: 99%

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Phylogeography and Origin of Sheep Breeds in Northern China

Rao

Shen-jin

et al. 2006

Conserv Genet

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“…2006). In previous study we showed that South Asia group contained both Tibetan sheep and South‐Southeast Asia sheep group (Sun et al. 2002), while in the present study we found that the Mongolia sheep group and Tibetan sheep group had a certain degree of gene communication.…”

Section: Discussionsupporting

confidence: 45%

The phylogeographic system survey of native sheep breeds in the eastern and southern Central Asia

Sun

Chang

Tsunoda

et al. 2010

J Animal Breeding Genetics

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The genetic diversity and phylogenetic survey of native sheep breeds in the eastern and southern Central Asia were assessed in the present study. The clustering, principal components, structure and F statistics all demonstrate that the native sheep breeds in these regions be classified into two genetic groups: Mongolia-Tibetan sheep group and South-Southeast Asia sheep group. The Mongolia sheep group and the Tibetan sheep group had a certain degree of gene communication from the ancient times. In the present study we demonstrated that the Chinese native sheep populations belonged to Mongolia-Tibetan sheep group. However, the relationships among the sheep populations in Mongolia sheep group in China were not closely related to the geographical distance among sheep populations.

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“…Abundant sheep genetic resources formed under differing natural conditions, and artificial selection then occurred in these regions. Much effort has led to the accumulation of valuable data on morphological and ecological characters, genetic diversity, and phylogenetic relationships Lu et al, 2005a,b;Sun et al, 2002Sun et al, , 2003Yang et al, 2004).…”

Section: Introductionmentioning

confidence: 96%

Genetic Differentiation of Native Sheep Populations in East and South Asia

et al. 2007

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Variations of four sheep populations in China were examined by multiloci electrophoresis, and similar data are quoted to analyze the degree of genetic differentiation of native sheep populations in East and South Asia. Among 15 populations, the average heterozygosity is 0.2746, and the effective number of alleles is 1.559. Mongolian sheep possess the highest genetic diversity, and diversity decreases sequentially in the Chinese, Vietnamese, Bangladeshi, and Nepalese populations. Coefficients of genetic differentiation are 0.0126-0.3083, with an average of 0.148, demonstrating that the major genetic variation (85%) exists within populations. Genetic identity and genetic distance all show relatively low genetic differentiation. No relationship was found between geographic distance and genetic distance. Gene flow is common among the mass of populations, which leads to the inconsistency between geographic distance and genetic distance. The 15 native sheep populations in East and South Asia can be divided into two groups, one group including part of the Chinese and Mongolian populations and another including the Yunnan population of China and part of the Nepalese and Bangladeshi populations. Other populations did not separate into groups, merging instead into the two main groups.

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Studies on the Genetic Relationships of Sheep Populations from East and South of Central Asia

Cited by 13 publications

References 3 publications

Phylogeography and Origin of Sheep Breeds in Northern China

Phylogeography and Origin of Sheep Breeds in Northern China

The phylogeographic system survey of native sheep breeds in the eastern and southern Central Asia

Genetic Differentiation of Native Sheep Populations in East and South Asia

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