Research note Seasonal variation of gastrointestinal nematodes of sheep in the region of Joannina, Greece

Théodoropoulos, Georgios; Koutsotolis, K.; Nikolaou, E.; Kalogiannis, D.; Petrakos, George

doi:10.1016/s0020-7519(98)00100-3

Cited by 16 publications

(12 citation statements)

References 7 publications

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“…Rainfall and FEC were only related from May to November 2004, and with a higher rainfall the FEC increased, so the results obtained here agreed with those recorded in Senegal, Greece, Cameroon, Canada and Ivory Coast (Vercruysse, 1983;Theodoropoulus et al, 1998;Ngambia et al, 2000;Colwell et al, 2002;Achi et al, 2003).…”

Section: Discussionsupporting

confidence: 89%

Gastrointestinal nematodes in rotationally grazing ewes in the mountainous region of central Mexico

et al. 2012

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The aims of this study were to determine the frequency of egg shedding (percentage of egg-positive faecal samples) and faecal egg counts (FEC) over 13 months in two different breeds of ewes, both pregnant and non-pregnant, in a mountainous region of central Mexico. Additionally, the effect of ivermectin and albendazole treatments on FEC reduction was recorded. The study also aimed to relate temperature and rainfall to FEC. The gastrointestinal nematode (GIN) third-stage larvae genera recovered from both faeces and grassland pastures in a temperate region were also assessed. Faecal samples were collected from ewes at monthly intervals for 13 months to investigate the FEC population of GIN larvae, their concentration and genera in grass samples collected from grazed and rested pastures. Egg-shedding frequency ranged from 0 to 92% and FEC from 0 to 12,000 eggs per g faeces (epg), with counts in Suffolk higher than in Dorset ewes. The identified genera were Haemonchus, Trichostrongylus, Teladorsagia, Cooperia, Oesophagostomum, Bunostomum, Nematodirus and Strongyloides. Haemonchus and Trichostrongylus were the most common genera. The number of L3 was higher in grazing lands than in those at rest. The highest FEC were recorded in the dry season due to peripartum, but the highest L3 counts were recorded in the rainy season. The coexistence of species of different geographical distributions at this site may be because there is a confluence of Nearctic and Neotropical geographic regions; thus, despite the temperate climate, tropical species can be found. Additionally, this study suggests that increasing temperatures could favour the presence of different tropical GIN species together with typical temperate-zone GIN species.

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Section: Discussionsupporting

confidence: 89%

Gastrointestinal nematodes in rotationally grazing ewes in the mountainous region of central Mexico

et al. 2012

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“…The infections remained generally low throughout the grazing period; however, the egg output in all the groups increased in autumn after the restart of strong rainfall. Similar seasonal patterns of strongyle infections were observed in Iraq (Altaif and Issa 1983) and north-west Greece (Theodoropoulos et al 1998).…”

Section: Discussionsupporting

confidence: 75%

“…Therefore, the economic effectiveness of anthelmintic treatment of weaned lambs in spring or early summer, as recommended by Gu¨ralp et al (1986) and others, is doubtful, at least under the extensive grazing conditions and the hot, dry climate of the southern Marmara region. The same conclusions were drawn from epidemiological studies in north-west Greece (Theodoropoulos et al 1998). However, it remains to be investigated whether or not the anthelmintic treatments of ewes at lambing or prior to mating are economically effective under the conditions in the southern Marmara region as shown for semi-arid areas, e.g.…”

Section: Discussionsupporting

confidence: 74%

Investigations on the seasonal patterns of strongyle infections in grazing lambs, and the occurrence of anthelmintic resistance on sheep and goat farms in western Anatolia, Turkey

et al. 2005

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The seasonal patterns of strongyle infections in untreated, weaned lambs were determined on four governmental farms during a grazing season. In three farms, the infection level (predominantly Teladorsagia spp. and Trichostrongylus spp.) measured by egg counts or worm burdens remained low throughout the study; higher egg counts mainly caused by Haemonchus contortus were transiently recorded on the fourth farm. Significant body weight gains were observed in all groups, but they varied between farms irrespective of the level of strongyle infections, suggesting that the economic effectiveness of anthelmintic treatments of weaned lambs is doubtful under the extensive grazing conditions and the hot, dry climate in the region. In the second part of the study, faecal egg count reduction tests were performed for albendazole, thiabendazole, tetramisole and ivermectin on 12 sheep and goat farms to provide first information on anthelmintic resistance in trichostrongyles of small ruminants in Turkey. There was no hint of benzimidazole resistance, and unequivocal evidence of ivermectin resistance was missing. In contrast, tetramisole resistance was detected on one sheep farm.

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“…sheep (Theodoropoulos et al, 1998), and lizards (Eisen and Eisen, 1999;Schall et al, 2000;Eisen et al, 2001;Lumbad et al, 2011, Pollock et al, 2012a. Host sex did not significantly affect lizard tick load, despite many studies showing that male animals across diverse taxa typically exhibit higher parasite loads than females (Poulin, 1996;Zuk and McKean, 1996;Anthony et al, 1994;Aubret et al, 2005;Klukowski and Nelson, 2001;Moore and Wilson, 2002;Morand et al, 2004;Folstad et al, 1989;Zuk, 1990;Tschirren et al, 2003), including lizards (Salkeld and Schwarzkopf, 2005;Schall and Marghoob, 1995;Schall et al, 2000).…”

Section: Occidentalismentioning

confidence: 99%

Physiological Factors Affecting the Bactericidal Activity of the Western Fence Lizard (Sceloporus Occidentalis) for the Lyme Disease Spirochete, Borrelia Burgdorferi

Weichert¹

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Research note Seasonal variation of gastrointestinal nematodes of sheep in the region of Joannina, Greece

Cited by 16 publications

References 7 publications

Gastrointestinal nematodes in rotationally grazing ewes in the mountainous region of central Mexico

Gastrointestinal nematodes in rotationally grazing ewes in the mountainous region of central Mexico

Investigations on the seasonal patterns of strongyle infections in grazing lambs, and the occurrence of anthelmintic resistance on sheep and goat farms in western Anatolia, Turkey

Physiological Factors Affecting the Bactericidal Activity of the Western Fence Lizard (Sceloporus Occidentalis) for the Lyme Disease Spirochete, Borrelia Burgdorferi

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