sheep breeds
Recently Published Documents


TOTAL DOCUMENTS

872
(FIVE YEARS 234)

H-INDEX

30
(FIVE YEARS 5)

BMC Genomics ◽  
2022 ◽  
Vol 23 (1) ◽  
Author(s):  
Cornelius Nel ◽  
Phillip Gurman ◽  
Andrew Swan ◽  
Julius van der Werf ◽  
Margaretha Snyman ◽  
...  

Abstract Background South Africa and Australia shares multiple important sheep breeds. For some of these breeds, genomic breeding values are provided to breeders in Australia, but not yet in South Africa. Combining genomic resources could facilitate development for across country selection, but the influence of population structures could be important to the compatability of genomic data from varying origins. The genetic structure within and across breeds, countries and strains was evaluated in this study by population genomic parameters derived from SNP-marker data. Populations were first analysed by breed and country of origin and then by subpopulations of South African and Australian Merinos. Results Mean estimated relatedness according to the genomic relationship matrix varied by breed (-0.11 to 0.16) and bloodline (-0.08 to 0.06) groups and depended on co-ancestry as well as recent genetic links. Measures of divergence across bloodlines (FST: 0.04–0.12) were sometimes more distant than across some breeds (FST: 0.05–0.24), but the divergence of common breeds from their across-country equivalents was weak (FST: 0.01–0.04). According to mean relatedness, FST, PCA and Admixture, the Australian Ultrafine line was better connected to the SA Cradock Fine Wool flock than with other AUS bloodlines. Levels of linkage disequilibrium (LD) between adjacent markers was generally low, but also varied across breeds (r2: 0.14–0.22) as well as bloodlines (r2: 0.15–0.19). Patterns of LD decay was also unique to breeds, but bloodlines differed only at the absolute level. Estimates of effective population size (Ne) showed genetic diversity to be high for the majority of breeds (Ne: 128–418) but also for bloodlines (Ne: 137–369). Conclusions This study reinforced the genetic complexity and diversity of important sheep breeds, especially the Merino breed. The results also showed that implications of isolation can be highly variable and extended beyond breed structures. However, knowledge of useful links across these population substructures allows for a fine-tuned approach in the combination of genomic resources. Isolation across country rarely proved restricting compared to other structures considered. Consequently, research into the accuracy of across-country genomic prediction is recommended.


2022 ◽  
pp. 106612
Author(s):  
Murtaza Ali ◽  
Devika Gautam ◽  
Sameni Deepika ◽  
Amar Singh Meena ◽  
Jatinder Chera ◽  
...  

2022 ◽  
Vol 42 ◽  
pp. 01029
Author(s):  
Ivona Dimitrova ◽  
Milena Bozhilova-Sakova ◽  
Margarit Iliev ◽  
Atanaska Teneva

Karnobat sheep plays an important role in the development of sheep breeding in Southeastern region of Bulgaria. They are valuable source of genetic material. The aim of present experiment was to determine the allele variation of CAST gene in Local Karnobat and Karnobat Merino sheep breeds. A total of 60 blood samples were collected – 30 per breed. DNA was extracted and genotypes of all animals were identified by means of PCR-RFLP technique. The restriction reactions were accomplished by specific enzyme MspI. As expected both breeds were characterized with low level of genetic diversity due to the fact that mostly maintaining selection has been implemented. In Local Karnobat sheep breed was identified only one heterozygous individual from all 30. In Karnobat merino were identified allele M with frequency 0,97 and allele N with frequency 0,03. Genotypes MM and MN were revealed with frequencies 0,93 and 0,07, respectively. According to the statistical analysis both breeds were in HWE equilibrium.


2021 ◽  
Author(s):  
A. V. Igoshin ◽  
T. E. Deniskova ◽  
A. A. Yurchenko ◽  
N. S. Yudin ◽  
A. V. Dotsev ◽  
...  

Author(s):  
Samir Id‐Lahoucine ◽  
Larry R. Schaeffer ◽  
Angela Cánovas ◽  
Joaquim Casellas

2021 ◽  
Vol 12 ◽  
Author(s):  
Abdessamad Ouhrouch ◽  
Simon Boitard ◽  
Frédéric Boyer ◽  
Bertrand Servin ◽  
Anne Da Silva ◽  
...  

Sheep farming is a major source of meat in Morocco and plays a key role in the country’s agriculture. This study aims at characterizing the whole-genome diversity and demographic history of the main Moroccan sheep breeds, as well as to identify selection signatures within and between breeds. Whole genome data from 87 individuals representing the five predominant local breeds were used to estimate their level of neutral genetic diversity and to infer the variation of their effective population size over time. In addition, we used two methods to detect selection signatures: either for detecting selective sweeps within each breed separately or by detecting differentially selected regions by contrasting different breeds. We identified hundreds of genomic regions putatively under selection, which related to several biological terms involved in local adaptation or the expression of zootechnical performances such as Growth, UV protection, Cell maturation or Feeding behavior. The results of this study revealed selection signatures in genes that have an important role in traits of interest and increased our understanding of how genetic diversity is distributed in these local breeds. Thus, Moroccan local sheep breeds exhibit both a high genetic diversity and a large set of adaptive variations, and therefore, represent a valuable genetic resource for the conservation of sheep in the context of climate change.


2021 ◽  
pp. 106905
Author(s):  
L. Pulinas ◽  
J. Starič ◽  
G. Cosso ◽  
G. Curone ◽  
M.C. Mura ◽  
...  

2021 ◽  
Vol 205 ◽  
pp. 106545
Author(s):  
Harshit Kumar ◽  
Manjit Panigrahi ◽  
Divya Rajawat ◽  
Anuradha Panwar ◽  
Sonali Sonejita Nayak ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document