Review: Genetics of helminth resistance in sheep

2014 ◽  
Vol 94 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Niel A. Karrow ◽  
Katherine Goliboski ◽  
Nancy Stonos ◽  
Flavio Schenkel ◽  
Andrew Peregrine
Keyword(s):  
Genetic Variants ◽  
Helminth Infection ◽  
Anthelmintic Resistance ◽  
Genetic Selection ◽  
Economic Loss ◽  
Helminth Parasites ◽  
Selection Strategies ◽  
Gastrointestinal Helminth ◽  
The World ◽  
Selection For

Karrow, N. A., Goliboski, K., Stonos, N., Schenkel, F. and Peregrine, A. 2014. Review: Genetics of helminth resistance in sheep. Can. J. Anim. Sci. 94: 1–9. Gastrointestinal helminth parasites are an important source of economic loss to sheep producers. A rapid increase in anthelmintic resistance has occurred around the globe; therefore, the industry is exploring alternative strategies such as genetic selection to control losses attributed to helminth infection. Since helminths have co-evolved with sheep for millions of years, natural selection for enhanced helminth resistance has occurred within certain breeds from various parts of the world. These breeds of sheep are being used to better understand the genetic aspects of helminth resistance. If the genetic variants that contribute to this phenotype can be identified, it may be possible to use selection strategies to introduce resistance alleles into other breeds or to increase their frequency within breeds. This review will provide an up-to-date overview of the pathology of helminth disease, the immune response to helminth infection, and the search for genes that confer helminth resistance.

Helminth parasites of native frogs (Leiopelmatidae) from New Zealand

1988 ◽  
Vol 66 (3) ◽  
pp. 707-713 ◽  
Author(s):  
Michael R. Baker ◽  
David M. Green
Keyword(s):  
New Zealand ◽  
Helminth Parasites ◽  
Gastrointestinal Helminth ◽  
Female Tail ◽  
The World ◽  
Frog Species ◽  
Males And Females ◽  
Somatic Musculature

The three native frog species of New Zealand were examined for gastrointestinal helminth parasites. Leiopelma hamiltoni was uninfected. Leiopelma hochstetteri was parasitized by the nematodes Aplectana novaezelandiae n.sp. and Cosmocerca australis n.sp. (both Cosmocercidae: Cosmocercinae), and the digenean Dolichosaccus (Lecithopyge) novaezealandiae Prudhoe, 1972 (Telorchiidae: Opisthoglyphinae). Leiopelma archeyi was infected with Cosmocerca archeyi n.sp. The three new cosmocercid species are differentiated readily from congenerics in other parts of the world by caudal features of the males and the shape of the female tail. Cosmocerca archeyi differs from C. australis in the shape of the tail in both males and females, the lack of rosette caudal papillae in males, and the possession of an unusually robust ventral somatic musculature in females. Since the native frogs from New Zealand are believed to have been isolated since the Mesozoic, the presence in them of cosmocercids that fall readily into well-established genera confirms the antiquity of the subfamily Cosmocercinae.

scholarly journals Gastrointestinal Helminths Infection in Different Types of Poultry

1970 ◽  
Vol 4 (1) ◽  
pp. 13-18 ◽  
Author(s):  
AKMA Rabbi ◽  
A Islam ◽  
S Majumder ◽  
A Anisuzzaman ◽  
MH Rahman
Keyword(s):  
Odds Ratio ◽  
Helminth Infection ◽  
Parasitic Infection ◽  
Helminth Parasites ◽  
Ascaridia Galli ◽  
Gastrointestinal Helminths ◽  
Backyard Poultry ◽  
Pathological Lesions ◽  
Gastrointestinal Helminth ◽  
Different Types

The prevalence of gastrointestinal helminth parasites and the gross pathological lesions produced by them in different types of poultry were studied from March 2005 to March 2006, in the Department of Parasitology, Bangladesh Agricultural University, Mymensingh. In this study, 240 viscera of three types of poultry such as broiler, layer and backyard indigenous chickens were collected from local markets of Mymensingh district. During routine examination, total six species of helminth parasites were recorded, of which three species were nematodes such as Ascaridia galli, Heterakis gallinarum and Capillaria annulata; two species were cestodes such as Raillietina tetragona and Amoebotaenia sphenoides and only one species was belonged to trematode such as Catatropis verrucosa. Prevalence of different species of gastrointestinal helminths was highest in backyard poultry (100%) followed by layer (48.75%) and broiler (3.75%) which was statistically significant (p < 0.01). Backyard poultry was significantly (p < 0.05) 168.21 and 4106.67 times more susceptible to helminth infection than layer and broiler respectively. But layer was 24.41 times more susceptible to helminth infection than broiler. In backyard poultry, all six species of helminth parasites were found. A statistically significant (p < 0.05) variation in the prevalence of the recovered parasites from backyard poultry were observed such as the prevalence of R. tetragona (100%) was the highest followed by that of A. galli (87.50%) and H. gallinarum (80%). From the odds ratio of the recovered parasites, it was observed that chance of developing R. tetragona (odds ratio 189.73) in backyard poultry was the highest followed by A. galli (odds ratio 7.51) and H. gallinarum (odds ratio 4.04). In case of layer, only A. galli and R. tetragona were recorded, of which, prevalence of A. galli was the highest (43.75%). In broiler, only A. galli (3.75%) was found. Gross pathological lesions were found only in backyard poultry. Pathological changes were detected in case of A. sphenoides and H. gallinarum infection. In A. sphenoides infection petechial hemorrhages were observed in the mucosa of the duodenum. On the other hand, tiny, white, circumscribed nodules of about 2-3 mm of diameter were found in the caecal mucosa in case of H. gallinarum infection. Results of the present study suggest that the backyard poultry is at the high risk of helminth infection. However, layers are also vulnerable to parasitic infection. So regular deworming is essential both in backyard poultry and layer birds to obtain better production from them. Key words: Gastrointestinal helminths, prevalence, pathology, broiler, layer, backyard poultry doi:10.3329/bjvm.v4i1.1519 Bangl. J. Vet. Med. (2006). 4 (1): 13-18

Prevalence of Gastrointestinal Helminth Parasites of Himalayan goral (Naemorhedus goral) in Kazinag National Park, Jammu and Kashmir, India

2021 ◽  
Author(s):  
Jahangir Ahmad Dar ◽  
Mustahson F. Fazili ◽  
Bilal A. Bhat ◽  
Riyaz Ahmad ◽  
Ishfaq Nazir Wani
Keyword(s):  
National Park ◽  
Animal Species ◽  
Helminth Infection ◽  
Natural Populations ◽  
Gastrointestinal Parasites ◽  
Helminth Parasites ◽  
Jammu And Kashmir ◽  
Gastrointestinal Helminth ◽  
Faecal Samples ◽  
Different Seasons

Background: Natural populations of ungulates are threatened by pathogens and parasites with gastrointestinal parasites being the most widespread. Parasitic infestation is one of the major problems in the management and a growing concern for the conservation of threatened wild animal species. The current study was undertaken to evaluate prevalence of gastrointestinal helminth parasites in Himalayan goral (Naemorhedus goral) in Kazinag National Park (KNP) of Kashmir.Methods: From May 2018 to June 2020, a total of 463 fresh faecal samples of Himalayan goral were collected from Kazinag National Park. The samples were processed by the standard sedimentation and floatation techniques.Result: Out of 463 faecal samples examined, 236 were found infected with GIT helminthes. In the present study five helminth species were found including, four nematodes [Haemonchus contortus (35.70%), Trichuris ovis (23.40%), Strongyloides spp. (20.80%) and Trichostrongylus spp. (12.30%)] and one cestode [Moneizia expansa (8.00%)]. Based on the severity of infection, 80.6% of goral positive samples were severely infected (epg greater than 1,500), 9.4% heavily infected (epg = 1,100-1,500), 3.3% moderately infected (epg = 800-1,000) and 6.8% mildly infected (epg = 500). Epidemiological prevalence of GIT helminthes in goral was profoundly influenced by different seasons. The maximum helminth infection was observed in summer season and minimum in winter (p = 0.03). Mixed infection was observed in 206 fecal samples with a prevalence of 47.24%.

scholarly journals Occurrence of Endoparasites in Domestic Fowls (GALLUS GALLUS) And Ducks (ANAS PLATYRHYNCHOS)

2021 ◽  
Vol 49 (1) ◽  
pp. 35-46
Author(s):  
Hamida Khanum ◽  
Sharmin Musa ◽  
Monirul Islam ◽  
Romana Akter ◽  
Fahmida Sarker
Keyword(s):  
Comparative Study ◽  
Alimentary Canal ◽  
Helminth Infection ◽  
Anas Platyrhynchos ◽  
Gallus Gallus ◽  
Helminth Parasites ◽  
Ascaridia Galli ◽  
Gastrointestinal Helminth ◽  
Peak Intensity ◽  
Different Parts

A comparative study was carried out to investigate the gastrointestinal helminth infection in domestic fowls Gallus gallus (30 specimens) and ducks Anas platyrhynchos (30 specimen). A total of 1610 helminth parasites of eight species from three taxonomic classes were recovered and identified from the different parts of alimentary canal. Among the parasitic group the cestodes were turned out to be predominant with a prevalence of 50.93% (820) whereas, the rate was 27.97% (450) and 21.19% (340) in nematodes and trematodes, respectively. The prevalence of parasites species were Ascaridia galli (80%), Echinostoma revolutum (73.33%), Raillientina echinobothrida (53.33%), Echinoparyphium recurvatum (53.33%), Cotugnia digonophora (50%), Amoebotaenia sphenoids (30%), Ascaridia hermaphoridita (43.33%) and Hymenolepis cantania (26.67%). The rate of infestation was higher (90%) in fowls than in ducks (80%) and the intensity of infections was slightly higher in ducks 31.67 (31.48 in domestic fowls). In both domestic fowls and ducks, cestode parasites were most dominant, and prevalence (83.33% and 16.80±4.31) and intensity were lower in fowls than in ducks (76.67% and 17.39 ± 4.2 2). Highest rate of infestation was observed in summer both in fowl (81.82%) and duck (70%) while, winter was associated with peak intensity of parasites in fowl (46.67) and in duck (44.28) observed in summer. The prevalence of parasites was higher in caecum of both domestic fowls and ducks. Bangladesh J. Zool. 49(1): 35-46, 2021

Genetic selection for nonstructural carbohydrates and its impact on other nutritive attributes of alfalfa ( Medicago sativa ) forage

2021 ◽  
Author(s):  
Annie Claessens ◽  
Marie Bipfubusa ◽  
Caroline Chouinard‐Michaud ◽  
Annick Bertrand ◽  
Gaëtan F. Tremblay ◽  
...  
Keyword(s):  
Medicago Sativa ◽  
Genetic Selection ◽  
Nonstructural Carbohydrates ◽  
Selection For

scholarly journals Influence of Genetic Selection for Growth and Broodstock Diet n-3 LC-PUFA Levels on Reproductive Performance of Gilthead Seabream, Sparus aurata

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 519
Author(s):  
Shajahan Ferosekhan ◽  
Serhat Turkmen ◽  
Cathaysa Pérez-García ◽  
Hanlin Xu ◽  
Ana Gómez ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Egg Quality ◽  
Sparus Aurata ◽  
Genetic Selection ◽  
Growth Trait ◽  
High Growth ◽  
Gilthead Seabream ◽  
Commercial Diet ◽  
Selection For ◽  
Broodstock Diet

Genetic selection in gilthead seabream (GSB), Sparus aurata, has been undertaken to improve the growth, feed efficiency, fillet quality, skeletal deformities and disease resistance, but no study is available to delineate the effect of genetic selection for growth trait on GSB reproductive performance under mass spawning condition. In this study, high growth (HG) or low growth (LG) GSB broodstock were selected to evaluate the sex steroid hormones, sperm, egg quality and reproductive performance under different feeding regime of commercial diet or experimental broodstock diet containing either fish oil (FO) or vegetable oil (VO) based diet. Under commercial diet feeding phase, broodstock selected for either high growth or low growth did not show any significant changes in the egg production per kg female whereas egg viability percentage was positively (p = 0.014) improved by the high growth trait broodstock group. The experimental diet feeding results revealed that both growth trait and dietary fatty acid composition influenced the reproductive performance of GSB broodstock. In the experimental diet feeding phase, we observed high growth trait GSB males produced a higher number of sperm cells (p < 0.001) and also showed a higher sperm motility (p = 0.048) percentage. The viable egg and larval production per spawn per kg female were significantly improved by the broodstock selected for high growth trait and fed with fish oil-based diet. This present study results signifies that gilthead seabream broodstock selected on growth trait could have positive role in improvement of sperm and egg quality to produce viable progeny.

Developmental morphology and anatomy of the reproductive structures in sunflower (Helianthus annuus): a unified temporal scale

Botany ◽  
2015 ◽  
Vol 93 (5) ◽  
pp. 307-316 ◽  
Author(s):  
L.I. Lindström ◽  
L.F. Hernández
Keyword(s):  
Disease Resistance ◽  
Helianthus Annuus ◽  
Oil Content ◽  
Genetic Selection ◽  
Reproductive Development ◽  
Developmental Morphology ◽  
Male And Female ◽  
Reproductive Structures ◽  
Selection For ◽  
Growing Conditions

In sunflower (Helianthus annuus L.), there has been an intense genetic selection for achenes with agronomic value, such as greater mass, oil content, and disease resistance. However, the information regarding the anatomical events that control their growth and maturation is surprisingly scarce. The aim of the present work was to study sunflower male and female sporogenesis and gametogenesis, as well as cell division and enlargement and tissue differentiation in the ovary and the embryo, linking the timing of these events to two frequently used phenological scales and a thermal time scale. In addition, we propose an ontogenetic scale that integrates the results of the present work to that of previous studies on sunflower reproductive development. The unified scales presented here provide a framework for others to investigate the relationships uncovered in this study in different genetic backgrounds and under different growing conditions.

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