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1.

001-es BibID:BIBFORM122766
035-os BibID:(Scopus)85198652941
Első szerző:Kichamu, Nelly (Animal scientist)
Cím:Assessing the population structure and genetic variability of Kenyan native goats under extensive production system / Nelly Kichamu, George Wanjala, Ludovic Toma Cziszter, Péter Strausz, Putri Kusuma Astuti, Zoltán Bagi, Szilvia Kusza
Dátum:2024
ISSN:2045-2322
Megjegyzések:Indigenous goats are important to many livelihoods. Despite this, they are subjected to indiscriminate crossbreeding. This afects their genetic variability which is needed to survive in current regime of climate change. The study assessed population structure and genetic diversity of Galla and Small East African goats (SEA) using pedigree information. A total of 7384 animals, 5222 of the Galla and 2162 of the SEA breeds, born between the years 1983 and 2022, were utilized. Individuals with known parents were defned as reference population. From the results, the maximum generation traced for Galla and SEA populations was 14.6 and 14.5, respectively. However, only 6 and 5 generations for Galla and SEA were complete. Pedigree completeness increased with the increasing number of generations. The average generation interval (GI) for Galla and SEA was 3.84 ± 0.04 and 4.4 ± 0.13 years. The average increase in the rate of inbreeding per generation for Galla and SEA was 0.04 and 0.05, with the efective ancestors and founders (fa/fe) ratio being same (1.00) for both breeds. Fifty percent (50%) of the genetic variability in the populations was contributed by 3 and 1 ancestor for Galla SEA, respectively. The efective population size (Ne) was 5.19 and 4.77 for Galla and SEA. Therefore, the current breeding programs should be changed to avoid future genetic bottlenecks in this population. These fndings ofer an opportunity to enhance the current genetic status and management of Kenyan native goats and other regions with similar production systems.
Tárgyszavak:Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Scientific Reports. - 14 : 1(2024), p. 1-11. -
További szerzők:Wanjala, George (1984-) (Animal scientist) Cziszter, Ludovic Toma Strausz Péter Astuti, Putri Kusuma (1994-) (állattenyésztési genetikus) Bagi Zoltán (1987-) (természetvédelmi mérnök, állatgenetika) Kusza Szilvia (1979-) (agrármérnök)
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2.

001-es BibID:BIBFORM129638
035-os BibID:(Scopus)105003158632 (WoS)001473869700019
Első szerző:Wanjala, George (Animal scientist)
Cím:Genetic diversity and adaptability of native sheep breeds from different climatic zones / George Wanjala, Zoltán Bagi, Dinu Gavojdian, Bouabid Badaoui, Putri Kusuma Astuti, Alexandru Mizeranschi, Elena Ilisiu, Husein Ohran, Eva Pasic Juhas, Dimitrios Loukovitis, Aldona Kawȩcka, Rūta Šveistienẻ, Zsolt Becskei, Péter Strausz, Nelly Kichamu, Szilvia Kusza
Dátum:2025
ISSN:2045-2322
Megjegyzések:To better understand the genetic architecture and adaptability of native sheep, 22 breeds were genotyped using ovine50K SNP chips. Eleven additional populations from open-source repositories were included. Cross population Extended Haplotype Homozygosity (XP-EHH) and Relative Scaled Haplotype Homozygosity (Rsb) haplotype-based approaches were used to identify genetic variations influencing the adaptation of local sheep breeds to different climatic zones. The results indicate that all breeds exhibited high but declining genetic diversity levels, with a larger proportion of genetic variation explained by development history and refined by geographical origin, as shown by principal component analysis and Neighbor Net graphs. Admixture analysis revealed high admixture levels in European and North African breeds. Using XP-EHH and Rsb methods, 371 genes were putatively under selection, with only nine common among all population pairs, highlighting unique adaptability. Most identified genes, including Interleukin (IL) and cluster differentiation (CD) gene families underlie immune responses, emphasizing their role in resilience to climate change effects. These findings support that indigenous sheep breeds have retained significant genetic diversity, but improper genetic management may threaten it. Additionally, the research emphasizes that indigenous sheep breeds' unique adaptability to specific climatic zones makes them valuable genetic assets for developing climate-resilient breeds.
Tárgyszavak:Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Scientific Reports. - 15 : 14143 (2025), p. 1-13. -
További szerzők:Bagi Zoltán (1987-) (természetvédelmi mérnök, állatgenetika) Gavojdian, Dinu Badaoui, Bouabid (1979-) (animal genetics engineer) Astuti, Putri Kusuma (1994-) (állattenyésztési genetikus) Mizeranschi, Alexandru Eugeniu Ilisiu, Elena Ohran, Husein Pasic Juhas, Eva Loukovitis, Dimitrios Kawęcka, Aldona Šveistienẻ, Rūta Becskei Zsolt Strausz Péter Kichamu, Nelly (1978-) (Animal scientist) Kusza Szilvia (1979-) (agrármérnök)
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3.

001-es BibID:BIBFORM109206
035-os BibID:(WoS)000954097600001 (Scopus)85152367636
Első szerző:Wanjala, George (Animal scientist)
Cím:Assessing the genomics structure of Dorper and White Dorper Variants, and Dorper Populations in South Africa and Hungary / George Wanjala, Putri Kusuma Astuti, Zoltán Bagi, Nelly Kichamu, Péter Strausz, Szilvia Kusza
Dátum:2023
ISSN:2079-7737
Megjegyzések:Simple Summary: The Dorper sheep breed was created to thrive in harsh environments in South Africa. Two breed variants were developed in the selection process. The breed gained popularity and was exported to several regions of the world where it is reported to be doing better than the purported locally adapted sheep breeds. To enhance the performance of other native sheep breeds, Dorper is widely utilized in crossbreeding with native breeds. There has not been any research done to examine the genomic status of Dorper in South Africa and Dorper in other places outside of South Africa. The genomic architecture of white Dorper and Dorper from South Africa and Hungary are compared in this study. White Dorper, Dorper, and Dorpers from South Africa and Hungary all have significantly distinct genomes. Different environmental factors and variations in coat color could be the cause of the genetic variations. Abstract: Dorper sheep was developed for meat production in arid and semi-arid regions under extensive production systems in South Africa. Two variants with distinct head and neck colors were bred during their development process. White Dorper have a white coat while Dorper have a black head and neck. Both variants have grown in popularity around the world. Therefore, understanding the genomic architecture between South African Dorpers and Dorper populations adapted to other climatic regions, as well as genomic differences between Dorper and White Dorper variants is vital for their molecular management. Using the ovine 50K SNP chip, this study compared the genetic architecture of Dorper variants between populations from South Africa and Hungary. The Dorper populations in both countries had high genetic diversity levels, although Dorper in Hungary showed high levels of inbreeding. White Dorpers from both countries were genetically closely related, while Dorpers were distantly related according to principal component analysis and neighbor-joining tree. Additionally, whereas all groups displayed unique selection signatures for local adaptation, Dorpers from Hungary had a similar linkage disequilibrium decay. Environmental differences and color may have influenced the genetic differentiation between the Dorpers. For their molecular management and prospective genomic selection, it is crucial to understand the Dorper sheep`s genomic architecture, and the results of this study can be interpreted as a step in this direction.
Tárgyszavak:Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
adaptation
dorper
genetic diversity
linkage disequilibrium
management best practices
population structure
Megjelenés:Biology. - 12 : 3 (2023), p. 1-11. -
További szerzők:Astuti, Putri Kusuma (1994-) (állattenyésztési genetikus) Bagi Zoltán (1987-) (természetvédelmi mérnök, állatgenetika) Kichamu, Nelly (1978-) (Animal scientist) Strausz Péter Kusza Szilvia (1979-) (agrármérnök)
Internet cím:DOI
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4.

001-es BibID:BIBFORM107113
035-os BibID:(Scopus)85147874170 (WoS)000935726900001
Első szerző:Wanjala, George (Animal scientist)
Cím:On-station comparative analysis of reproductive and survival performance between Red Maasai, Dorper, and Merino sheep breeds / George Wanjala, Nelly Kichamu, Péter Strausz, Putri Kusuma Astuti, Szilvia Kusza
Dátum:2023
ISSN:1751-7311 1751-732X
Tárgyszavak:Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Animal. - 17 : 3 (2023), p. 1-6. -
További szerzők:Kichamu, Nelly (1978-) (Animal scientist) Strausz Péter Astuti, Putri Kusuma (1994-) (állattenyésztési genetikus) Kusza Szilvia (1979-) (agrármérnök)
Internet cím:DOI
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5.

001-es BibID:BIBFORM105907
035-os BibID:(WoS)000920397200011 (Scopus)85143612439
Első szerző:Wanjala, George (Animal scientist)
Cím:A review on the potential effects of environmental and economic factors on sheep genetic diversity : consequences of climate change / George Wanjala, Putri Kusuma Astuti, Zoltán Bagi, Nelly Kichamu, Péter Strausz, Szilvia Kusza
Dátum:2023
ISSN:1319-562X 2213-7106
Megjegyzések:Climate change has a significant effect on the productivity of livestock including milk, meat, and reproduction. This could be attributed to the internal diversion of energy resources towards adaptive mechanisms. Among the climate change variables, thermal stress seems to be the major limiting factor in animal agriculture. A better understanding of the effects of climate change-influenced ecological factors on the genetic diversity of livestock species is warranted. Sheep is an ideal livestock species to be used in investigating environmental adaptation due to its wide range of agroecological habitats, genetic and phenotypic variability. There is a heavy reliance on sheep genetic diversity for future animal protein security, but the implications of climate change on their genetic diversity receive less attention. Here, the potential environmental factors influencing natural selection in sheep populations are presented. We argue that prolonged exposure to these factors plays a major role in influencing the development of adaptation traits in indigenous sheep breeds, consequently leading to the alteration of genetic diversity at specific loci. The factors discussed include hot temperatures (heat stress), insufficient water, low quantity and quality of forage, and prevalence of parasites, pests, and diseases. In addition, genetic diversity, some signatures of selection for adaptation and economic angles of selection are also briefly discussed. A better understanding of environmental factors influencing the genetic diversity of sheep populations will inform breeding and management programs and may offer an opportunity for greater production efficiency with low input costs.
Tárgyszavak:Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Genetic diversiy
sheep populations
environmental factors
economic factors
climate change
Megjelenés:Saudi Journal of Biological Sciences. - 30 : 1 (2023), p. 1-10. -
További szerzők:Astuti, Putri Kusuma (1994-) (állattenyésztési genetikus) Bagi Zoltán (1987-) (természetvédelmi mérnök, állatgenetika) Kichamu, Nelly (1978-) (Animal scientist) Strausz Péter Kusza Szilvia (1979-) (agrármérnök)
Internet cím:Szerző által megadott URL
DOI
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