Arrested larval development in cattle nematodes

Armour, J.; Duncan, Mary C.

doi:10.1016/0169-4758(87)90173-6

Cited by 58 publications

(26 citation statements)

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“…The bovine parasitic nematodes of major economic importance in temperate regions of the world are: the trichostrongyles Ostertagia ostertagi (Stiles, 1892) and Cooperia oncophora (Railliet, 1898), found in the abomasum and the small intestine respectively, and Dictyocaulus viviparus (Bloch, 1782), in the lungs (Armour and Duncan 1987, Fiel et al 1988, Steffan and Fiel 1994. O. ostertagi is the most pathogenic and economically important agent in temperate cattle areas of Latin America and the rest of the world (Armour 1980, Anderson 1986, Entrocasso 1986.…”

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“…Twenty-one days elapse from the time when the animals take in infective larvae (L 3 ) with the grass until the prepatent period is completed. However, on certain occasions, ingested larvae temporarily stop their development at the beginning of their fourth stage (L 4 ) (Williams 1983, Armour and Duncan 1987, Fiel and Steffan 1994a.…”

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confidence: 99%

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“…The arrestment time corresponds to the unfavourable period (Armour 1980, Armour and Duncan 1987, Suárez and Busetti 1989, Suárez 1990, Nari and Rizzo 1994, Fiel and Steffan 1994a. In the northern hemisphere, larvae are inhibited during the end of autumn and winter, renewing their development at the beginning of spring (Randall and Gibbs 1977, Armour 1980, Williams 1983, Smith and Grenfell 1985, Armour and Duncan 1987. On the other hand, in the southern hemisphere, larvae are inhibited in spring and part of the summer, renewing their development from the middle of summer until autumn (Armour 1980, Williams 1983, Smith and Grenfell 1985, Entrocasso 1986, Fiel et al 1988, Suárez 1990).…”

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Hypobiosis induction alters the protein profile of Ostertagia ostertagi (Nematoda: Trichostrongylidae)

Dopchiz

Parma²,

Fiel³

2000

FOLIA PARASIT

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Abstract. The appearance of variations in the protein profile of Ostertagia ostertagi (Stiles, 1892) infective larvae (L 3 ), which were induced by hypobiosis triggering factors, was evaluated by means of SDS-PAGE and densitometric analysis. Area integration analyses of their protein profiles was carried out between 66 and 77 kDa. Important quantitative variations were identified in the protein levels of the induced larvae, where a 5.25 fold increase compared to the control was observed. Two 75.4 and 70 kDa protein bands were found which exceeded the control profile by 4.5 and 44 fold, respectively. This fact suggests that the changes brought about in the process of hypobiosis induction are restricted. This work demonstrates changes at a molecular level corresponding with biological changes induced by conditions causing O. ostertagi hypobiosis.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Hypobiosis induction alters the protein profile of Ostertagia ostertagi (Nematoda: Trichostrongylidae)

Dopchiz

Parma²,

Fiel³

2000

FOLIA PARASIT

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“…New hosts can be infected by eating eggs of Trichuris spp. Typically, under harsh environmental conditions, parasite transmission rates are low in winter (Halvorsen et al, 1999) and larvae undergo arrested development in the abomasal mucosa, maturing in late winter or spring (Armour and Duncan, 1987), although some nematode taxa do shed eggs and show continued transmission during winter in the arctic . We do not know the life-history strategies of the nematodes in our study.…”

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confidence: 99%

Gastrointestinal Nematodes of Moose (Alces Alces) in Relation to Supplementary Feeding

Milner¹,

Wedul²,

Laaksonen

et al. 2013

Journal of Wildlife Diseases

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ABSTRACT:Winter supplementary feeding of wildlife is controversial because it may promote parasite and disease transmission by host aggregation. We investigated the effect of winter supplemental feeding of Scandinavian moose (Alces alces) on gastrointestinal (GI) parasite infection in two counties of southern Norway by comparing fecal egg counts of moose using, and not using, feeding stations between January 2007 and March 2010. We identified three different GI nematodes based on egg morphology. All three were found in Hedmark county while in Telemark county we found only Trichuris sp. (prevalence 33%). Prevalence of Trichostrongylidae (65%) and Nematodirus sp. (26%) in Hedmark was not affected by feeding station use. However, the probability of infection varied significantly between years sampled (Trichostrongylidae) and age class (Nematodirus sp.). Fecal egg counts (FEC), a proxy for intensity of infection, of Trichostrongylidae were higher in the year when winter weather conditions were more challenging and prevalence was higher, and decreased with increasing body mass. Adult moose had higher FECs than did juvenile moose, and female juveniles had lower abundances than did male juveniles. Use of feeding stations did not affect probability of infection with any of the nematodes or intensity of infection with Trichostrongylidae. We discuss our findings in terms of parasite life histories and recommend that parasitologic surveillance be included in the monitoring of feeding programs.

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The Greening of Pharmaceutical Engineering

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Arrested larval development in cattle nematodes

Cited by 58 publications

References 20 publications

Hypobiosis induction alters the protein profile of Ostertagia ostertagi (Nematoda: Trichostrongylidae)

Hypobiosis induction alters the protein profile of Ostertagia ostertagi (Nematoda: Trichostrongylidae)

Gastrointestinal Nematodes of Moose (Alces Alces) in Relation to Supplementary Feeding

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