The steppe species of gastrointestinal nematodes of small ruminants, with a focus on<i>Marshallagia</i>: climate as a key determinant

Meradi, Salah; Bentounsi, B.; Zouyed, Ilhem; Cabaret, Jacques

doi:10.1051/parasite/2011183261

Cited by 15 publications

(20 citation statements)

References 23 publications

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“…The main abomasal worm species found in the area were T. circumcincta and M. marshalli . The same fauna has also been recorded on farms in eastern Algeria by Bentounsi et al [ 4 ], in Iraq by Altaif and Issa [ 1 ], in Syria by Giangaspero et al [ 18 ] and in Morocco by Cabaret [ 7 ], as well as in various sites studied in a meta-analysis of the steppe region by Meradi et al [ 25 ] or other similar regions by Suarez and Cabaret [ 37 ]. Under the same steppe climate, the faecal egg excretion dynamics found in Algeria by Bentounsi et al [ 4 ] or Boulkaboul and Moulaye [ 6 ] showed two peaks of excretion of eggs, one in spring and one in autumn.…”

Section: Discussionsupporting

confidence: 63%

Arrested development of abomasal trichostrongylid nematodes in lambs in a steppe environment (North-Eastern Algeria)

2016

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Arrested development of abomasal trichostrongylid nematodes was studied in 30 permanent grazing lambs on a large farm in the North-East of Algeria. The steppe climate has cold winters and hot and dry summers. The lambs were monitored monthly for gastrointestinal nematodes using nematode faecal egg counts, from February 2008 to February 2009. Every 2 months, two of the original 30 permanent lambs were necropsied after being held in pens for three weeks so that recently ingested infective larvae could develop into adults. The highest percentage of fourth stage larvae (L4), reaching 48% of the total worm burden, was recorded in abomasal contents in June. Teladorsagia and other Ostertagiinae constituted the highest percentage of L4 larvae (71%), whereas the percentage of Trichostrongylus (17.4%) or Haemonchus (11.6%) remained low. The dynamics of infection observed here (highest faecal egg count in August) and the stage composition of worm burden (highest percentage of L4 in June) provide strong evidence that arrested development had occurred.

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Section: Discussionsupporting

confidence: 63%

Arrested development of abomasal trichostrongylid nematodes in lambs in a steppe environment (North-Eastern Algeria)

2016

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“…In last decade the infection of Marshallagia marshalli was recorded from Algeria (Meradi et al, 2011), Iran (Naem and Gorgani, 2011;Moradpour et al, 2014) and Iraq (Al-Bayati and Arsalan, 2009;Nasrullah et al, 2014;Mohammedameen, 2016). Meradi et al (2011) reported prevalence of this nematode parasite in small ruminants ranging 21 to 81 percent in Algeria and established significant linear regression between prevalence of Marshallagia marshalli and rainfall. They reported association of low rainfall to higher M marshalli prevalence.…”

Section: Marshallagia Marshallimentioning

confidence: 99%

Gastrointestinal Helminthic Challenges in Sheep and Goats in Afro-Asian Region: A Review

Sharma¹

2020

JAR

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Sheep and goats, being hardy and prolific in their growth, play a crucial role in cultural and socioeconomic life of rural poor under privileged people in Afro-Asian countries by providing meat, milk, wool and hide to them. Gastrointestinal helminthic infections are worldwide problem in ruminants. They results considerable loss in them causing mortality and poor production. Various helminthes types like trematodes, cestodes and nematodes are prevalent in different climates and geographical regions depending on rearing systems, intermediate host's availability and management practices. Epidemiology of helminthic diseases, though variable at times, is determined by various factors like treatment, climate and poverty (socio-economic and traditional practices). The study oversees gastrointestinal helminthic challenges in goats and sheep faced in Afro-Asian region in last decade. Methodology involves exhaustive exercise of screening and massive literature hunt which included published research, both abstracts and full length papers on the subject in last 10 years in addition to authors own observations. The diseases like Fasciolosis, Dicrocoelosis, Amphistomosis in trematodes, Monieziosis, Avitellinosis in cestodes and Haemonchosis, Trichostronglylosis, Oesophagostomosis, Trichuriosis, Strongyloidosis in nematodes were still serious challenges in the region threatening the small ruminant production. Frequent reports on Marshallgia, Ostertagia, Nematodirus, Stilesia, Thysaniezia spp. from this region showed emerging threats. Infections like Camelostrongylus, Graphidiops, Parabronema and Skrjabinema spp. were scarcely distributed. The paper reviews scientific work and developments of last 10 years on occurrence, distribution and epidemiology of common gastrointestinal helminthic infections of sheep and goats in Afro-Asian region with future research prospective in light of newer scientific approaches.

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“…It has been shown that while some trichostrongyle species present a very wide range of geographic distributions ( Teladorsagia circumcincta, Haemonchus contortus and Trichostrongylus ) others are restricted to more specific climates (Suarez & Cabaret, 1991). The trichostrongyle Marshallagia marshalli is an example of the latter and is strongly associated with sheep and goats in steppe climates (Suarez & Cabaret, 1991; Meradi et al, 2011). A large-scale multi-regional study (Meradi et al, 2011) showed that rainfall was the best indicator for M. marshalli prevalence in a steppe climate.…”

Section: Introductionmentioning

confidence: 99%

Climate influences assemblages of abomasal nematodes of sheep on steppe pastures in the east of Algeria

Zouyed

Cabaret²,

Bentounsi

2016

J. Helminthol.

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It is a common view that assemblages of parasitic nematodes are influenced by climatic conditions; however, there are only a few articles available regarding those that infect farm animals. We investigated the relationship between climate variables and infection with abomasal trichostrongyles in 335 1-year-old rams grazed on steppe pastures in Eastern Algeria. Abomasa were collected from 12 local slaughterhouses located in four climatic areas (from humid to arid) and the worms extracted, identified and counted. The abundance was low and the fauna composed primarily of Teladorsagia circumcincta, Marshallagia marshalli and Trichostrongylus sp. The high percentage of M. marshalli is typical of steppe areas. Ostertagia ostertagi and Haemonchus contortus were present in low numbers. Rainfall was the most important climatic variable related to the main species. This relationship was not linear for M. marshalli but an optimal rainfall was detected (350-400 mm/year). The more complex climatic indicators used in the study did not demonstrate a more significant correlation than rainfall. The predictive value of rainfall on the abundance or proportion of species in the assemblage was modest but highly significant. The seasonality of assemblages was different between the two main sub-climates (sub-humid and semi-arid).

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The steppe species of gastrointestinal nematodes of small ruminants, with a focus onMarshallagia: climate as a key determinant

Cited by 15 publications

References 23 publications

Arrested development of abomasal trichostrongylid nematodes in lambs in a steppe environment (North-Eastern Algeria)

Arrested development of abomasal trichostrongylid nematodes in lambs in a steppe environment (North-Eastern Algeria)

Gastrointestinal Helminthic Challenges in Sheep and Goats in Afro-Asian Region: A Review

Climate influences assemblages of abomasal nematodes of sheep on steppe pastures in the east of Algeria

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