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61 results for “Ovis”
Data from: Genome-wide SNP analysis unveils genetic structure and phylogeographic history of snow sheep (Ovis nivicola) populations inhabiting the Verkhoyansk Mountains and Momsky Ridge (northeastern Siberia)
Insights into the genetic characteristics of a species provide important information for wildlife conservation programs. Here, we used the OvineSNP50 BeadChip developed for domestic sheep to examine population structure and evaluate genetic diversity of snow sheep (Ovis nivicola) inhabiting Verkhoyansk Range and Momsky Ridge. A total of 1121 polymorphic SNPs were used to test 80 specimens representing five populations, including four populations of the Verkhoyansk Mountain chain: Kharaulakh Ridge–Tiksi Bay (TIK, n = 22), Orulgan Ridge (ORU, n = 22), the central part of Verkhoyansk Range (VER, n = 15), Suntar-Khayata Ridge (SKH, n = 13), and Momsky Ridge (MOM, n = 8). We showed that the studied populations were genetically structured according to a geographical pattern. Pairwise FST values ranged from 0.044 to 0.205. Admixture analysis identified K = 2 as the most likely number of ancestral populations. A Neighbor-Net tree showed that TIK was an isolated group related to the main network through ORU. TreeMix analysis revealed that TIK and MOM originated from two different ancestral populations and detected gene flow from MOM to ORU. This was supported by the f3 statistic, which showed that ORU is an admixed population with TIK and MOM/SKH heritage. Genetic diversity in the studied groups was increasing southward. Minimum values of observed (Ho) and expected (He) heterozygosity and allelic richness (Ar) were observed in the most northern population–TIK, and maximum values were observed in the most southern population–SKH. Thus, our results revealed clear genetic structure in the studied populations of snow sheep and showed that TIK has a different origin from MOM, SKH and VER even though they are conventionally considered a single subspecies known as Yakut snow sheep (Ovis nivicola lydekkeri). Most likely, TIK was an isolated group during the late Pleistocene glaciations of Verkhoyansk Range.
FIGURE 3 in Rumen ciliates in Brazilian sheep (Ovis aries), with new records and redescription of Entodinium contractum (Entodiniomorphida: Ophryoscolecidae)
FIGURE 3. Entodinium contractum Kofoid & Christenson recorded in Brazilian sheep. A. Schematic drawing based on live observation; B. Specimen of Entodinium contractum after Lugol's solution; C. Schematic drawing based on silver carbonate impregnation. D. Specimen of Entodinium contractum after silver carbonete impregnation. ACZ: Adoral ciliary zone; AP: Adoral polybrachkynety; Ma: Macronucleus; Mi: Micronucleus; Ve: Vestibulum; VP: Vestibular polybrachkynety. Bars: 20µm.
FIGURE 2 in Rumen ciliates in Brazilian sheep (Ovis aries), with new records and redescription of Entodinium contractum (Entodiniomorphida: Ophryoscolecidae)
FIGURE 2. Average relative abundance of two subfamilies of Ophryoscolecid ciliates in Brazilian sheep fed diets containing different concentrate levels (20, 40, 60 and 80%).
FIGURE 1 in Rumen ciliates in Brazilian sheep (Ovis aries), with new records and redescription of Entodinium contractum (Entodiniomorphida: Ophryoscolecidae)
FIGURE 1. Average relative abundance of three families (Isotrichidae, Ophryoscolecidae and Parentodiniidae) of rumen ciliates in Brazilian sheep fed diets containing different concentrate levels (20, 40, 60 and 80%).
FIGURE 1 in Description of Diploplastron dehorityi sp. nov. (Entodiniomorphida, Ophryoscolecidae), a new rumen ciliate from Brazilian sheep (Ovis aries)
FIGURE 1. Diploplastron ciliates recorded in Brazilian domestic sheep (Ovis aries L.). a–f. Diploplastron dehorityi sp. nov. a. Schematic drawing based on specimen stained with Lugol's solution. b. Schematic drawing of the oral infraciliary bands pattern. c–d. Schematic drawing of variations in the morphology of skeletal plates. e. Specimen stained with Lugol's solution. f. Specimen impregnated with silver carbonate. g–j. Diploplastron affine (Dogiel and Fedorowa, 1925). g. Schematic drawing based on specimen stained with Lugol's solution. h. Schematic drawing of the oral infraciliary bands pattern. i. Specimen stained with Lugol's solution. j. Specimen impregnated with silver carbonate. e–j. ACZ: adoral ciliary zone; AP: adoral polybrachykinety; CV: contractile vacuole; DCZ: dorsal ciliary zone; DP: dorsal polybrachykinety; Ma: macronucleus; Mi: micronucleus; Sk: skeletal plate; VP: vestibular polybrachykinety. Bars (e, f, i, j): 20 µm.
FIGURES 13–16 in Rumen Ciliate Fauna of Domestic Sheep (Ovis aries) in İzmir, Turkey and Scanning Electron Microscopic Observations
FIGURES 13–16. SEM images of (13) Enoploplastron triloricatum, (14)–(16) Dasytricha ruminantium. AL: Adoral Lip, CR: Ciliary Rows, DL: Dorsal Lip, O: Operculum, P: Pore of contractile vacuole. Small numerous holes (arrowheads).
FIGURES 1–4 in Rumen Ciliate Fauna of Domestic Sheep (Ovis aries) in İzmir, Turkey and Scanning Electron Microscopic Observations
FIGURES 1–4. SEM images of (1) Entodinium longinucleatum, (2) E. bursa, (3) E. rectangulatum m. rectangulatum, (4) E. semahatae. AL: Adoral Lip, CL: Caudal Lobe, CS: Caudal Spine, P: Pore of contractile vacuole.
FIGURES 17–20 in Rumen Ciliate Fauna of Domestic Sheep (Ovis aries) in İzmir, Turkey and Scanning Electron Microscopic Observations
FIGURES 17–20. SEM images of (17)–(18) Ophryoscolex caudatus m. tricoronatus, (19) Epidinium ecaudatum m. parvicaudatum, (20) Polyplastron multivesiculatum. ACZ: Adoral Ciliary Zone, CP: Cytoproct, CS: Caudal Spine, DCZ: Dorsal Ciliary Zone, O: Operculum, P: Pore of contractile vacuole.
FIGURES 5–8 in Rumen Ciliate Fauna of Domestic Sheep (Ovis aries) in İzmir, Turkey and Scanning Electron Microscopic Observations
FIGURES 5–8. SEM images of (5) Entodinium exiguum, (6) E. minimum, (7) E. simulans m. caudatum, (8) E. dilobum. ACZ: Adoral Ciliary Zone, AL: Adoral Lip, CL: Caudal Lobe, CP: Cytoproct, CS: Caudal Spine, P: Pore of contractile vacuole.
On following pages: 199. Kazakhstan Argali (Ovis collium); 200. Marco Polo Argali (Ovis poli); 201. Tibetan Argali (Ovis hodgsoni); 202. Altai Argali (Ovis ammon); 203. Gobi Argali (Ovis darwini); 204. Shansi Argali (Ovis jubata); 205. Snow Sheep (Owvis nivicola); 206. Bighorn Sheep (Ovis canadensis); 207. Dall's Sheep (Ovis dalli). in Bovidae
On following pages: 199. Kazakhstan Argali (Ovis collium); 200. Marco Polo Argali (Ovis poli); 201. Tibetan Argali (Ovis hodgsoni); 202. Altai Argali (Ovis ammon); 203. Gobi Argali (Ovis darwini); 204. Shansi Argali (Ovis jubata); 205. Snow Sheep (Owvis nivicola); 206. Bighorn Sheep (Ovis canadensis); 207. Dall's Sheep (Ovis dalli).
On following pages: 189. Isfahan Sheep (Ovis isphahanica); 190. Laristan Sheep (Ovis laristanica); 191. Ladakh Urial (Ovis vignei); 192. Punjab Urial (Ovis punjabiensis); 193. Bukhara Urial (Ovis bochariensis); 194. Arabian Wild Sheep (Ovis arabica); 195. Afghan Urial (Ovis cycloceros). in Bovidae
On following pages: 189. Isfahan Sheep (Ovis isphahanica); 190. Laristan Sheep (Ovis laristanica); 191. Ladakh Urial (Ovis vignei); 192. Punjab Urial (Ovis punjabiensis); 193. Bukhara Urial (Ovis bochariensis); 194. Arabian Wild Sheep (Ovis arabica); 195. Afghan Urial (Ovis cycloceros).
Figure 7. Ovis aries Linnaeus, 1758. A in Scelidosaurus harrisonii (Dinosauria: Ornithischia) from the Early Jurassic of Dorset, England: biology and phylogenetic relationships
Figure 7. Ovis aries Linnaeus, 1758. A, lateral view of cranial osteology showing the horn core. B, the horn core with its keratinous horn superimposed, showing the lack of correspondence in shape between the horn core and its overlying keratinous casque (horn). Norman, pers. colln (Rough Fell sheep, Sedbergh, Cumbria). Abbreviations: hc, horn core; kh, keratinous horn. Scale bar indicated.
Figure 2 in An update on the Tibetan hodgsoni in Nepal argali Ovis ammon
Figure 2: Photographs of the Tibetan argali from Dolpa, Mustang and Humla districts of Nepal. (A) A young male argali seen during August 2016 in the alpine grassland of Nulungsumda within Charka VDC of Dolpa district, © Naresh Kusi. (B) One of the two adult males argali seen during November 2016 in upper Damodar kunda, © Naresh Kusi. (C) A group of three (only two visible) adult females with two juveniles seen during July 2013 in the alpine grasslands of Chyakpalung within Limi VDC of Humla district, © Geraldine Werhahn.
Data from: A genome-wide scan study identifies a single nucleotide substitution in ASIP associated with white versus non-white coat-colour variation in sheep (Ovis aries)
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Data from: Genomic consequences of genetic rescue in an insular population of bighorn sheep (Ovis canadensis)
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Data from: Genome-wide SNP analysis unveils genetic structure and phylogeographic history of snow sheep (Ovis nivicola) populations inhabiting the Verkhoyansk Mountains and Momsky Ridge (northeastern Siberia)
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Data from: Characterizing population and individual migration patterns among native and restored bighorn sheep (Ovis canadensis)
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Data from: Conserved genetic architecture underlying recombination rate variation in a wild population of Soay sheep (Ovis aries)
Meiotic recombination breaks down linkage disequilibrium and forms new haplotypes, meaning that it is an important driver of diversity in eukaryotic genomes. Understanding the causes of variation in recombination rate is important in interpreting and predicting evolutionary phenomena and for understanding the potential of a population to respond to selection. However, despite attention in model systems, there remains little data on how recombination rate varies at the individual level in natural populations. Here, we used extensive pedigree and high-density SNP information in a wild population of Soay sheep (Ovis aries) to investigate the genetic architecture of individual autosomal recombination rate. Individual rates were high relative to other mammal systems, and were higher in males than in females (autosomal map lengths of 3748 cM and 2860 cM, respectively). The heritability of autosomal recombination rate was low but significant in both sexes (h2 = 0.16 & 0.12 in females and males, respectively). In females, 46.7% of the heritable variation was explained by a sub-telomeric region on chromosome 6; a genome-wide association study showed the strongest associations at the locus RNF212, with further associations observed at a nearby ~374kb region of complete linkage disequilibrium containing three additional candidate loci, CPLX1, GAK and PCGF3. A second region on chromosome 7 containing REC8 and RNF212B explained 26.2% of the heritable variation in recombination rate in both sexes. Comparative analyses with 40 other sheep breeds showed that haplotypes associated with recombination rates are both old and globally distributed. Both regions have been implicated in rate variation in mice, cattle and humans, suggesting a common genetic architecture of recombination rate variation in mammals.
Ovis dalli (Bovidae) - whole organism
Image of Ovis dalli (Bovidae) - whole organism
Data from: "RAD Sequencing for SNP Discovery in Two Populations of Bighorn Sheep (Ovis canadensis)" in Genomic Resources Notes accepted 1 April 2013 - 31 May 2013
In this work we present the development of a large set of single nucleotide polymorphisms (SNPs) discovered in two populations of bighorn sheep (Ovis canadensis). To do so we used restriction-site associated DNA (RAD) sequencing of four individuals from each population. Through alignment of reads to the domestic sheep (Ovis aries) genome we discovered >83,000 SNPs, of which >38,000 are suitable for assays such as an Illumina SNP chip. These loci will allow for fine-mapping of loci associated with horn size, and examination of the consequences of the genetic rescue including mapping genes underling differences in life-history characteristics.
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