Winter survival of trichostrongyle larvae: a study using tracer lambs

Kerbœuf, Dominique

doi:10.1016/s0034-5288(18)31810-1

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…The seasonalities of H. contortus (autumn) and Nematodirus (summer-autumn) are in accordance with other studies in Mediterranean areas (Tarazona et al, 1985;Kerboeuf, 1985;Nabon and Gruner, 1986;Gruner et al, 1987).…”

Section: Discussionsupporting

confidence: 91%

Prevalence and Seasonal Pattern of Caprine Trichostrongyles in a Dry Area of Central Spain

Valcárcel¹,

Romero

1999

Journal of Veterinary Medicine, Series B

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A total of 322 gastrointestinal tracts were examined from traditionally reared goats originating from a dry area of central Spain. A large spectrum of gastrointestinal nematodes was observed, Teladorsagia circumcincta and T. trifurcata being the most prevalent species, followed by Trichostrongylus vitrinus and Nematodirus filicollis. Trichostrongylus capricola recorded a high level of infection despite low prevalence. A nematode infection rate of 93 % and an average burden of over 3000 worms indicates the highly prevalent infection in Spanish goats. The seasonal pattern shows a real risk of infection all year round, with two peaks in the summer and autumn. Females were more frequently infected than males.

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Section: Discussionsupporting

confidence: 91%

Prevalence and Seasonal Pattern of Caprine Trichostrongyles in a Dry Area of Central Spain

Valcárcel¹,

Romero

1999

Journal of Veterinary Medicine, Series B

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“…Our proposed substitution strategy could be easily incorporated into intensive ruminant management programmes. T. circumcincta is particularly well adapted to winter conditions (Kerboeuf, 1985), and survives low temperatures better than other parasitic nematode species (Haemonchus sp. or Trichostrongylus sp.)…”

Section: Discussionmentioning

confidence: 99%

Substitution of benzimidazole-resistant nematodes for susceptible nematodes in grazing lambs

Moussavou-boussougou¹,

Silvestre²,

Cortet³

et al. 2006

Parasitology

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Multi-drug-resistant gastrointestinal nematode parasite populations are becoming more and more prevalent. Since anthelmintic treatments are of limited effectiveness, one solution could be to replace the anthelmintic-resistant population by a susceptible population, in order to re-establish the possibility of drug-based anthelmintic control. We investigated this substitution strategy in 4 paddocks of 0.7 ha, each of which was seeded with a benzimidazole-resistant Teladorsagia circumcincta population. The proportion of benzimidazole-resistant worms in these paddocks ranged from 20% to 89%. A 2-step replacement was performed: first, the paddocks were not grazed for 6 months (from December to July), and then the grass was cut to eliminate any residual infective larvae, before contaminating each of the paddocks with 10 seeder lambs experimentally infected with a benzimidazole-susceptible strain of T. circumcincta (from July to November). At the end of the experiment, all the populations on the 4 paddocks were phenotypically benzimidazole-susceptible, but genotyping indicated that 2 populations harboured 1% and 3% resistant worms respectively. This study demonstrates that nematode replacement is feasible in temperate areas, using semi-intensive stock management, even when the initial levels of benzimidazole-resistance are very high. Further research should next assess replacing the whole community to cope with the species diversity observed under field conditions.

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“…[ 16 , 17 ]made similar observations on farms practizing 'clean' grazing, where very low initial pasture larval counts (less than 200 L3/kg) resulted in high worm burdens in tracer lambs grazing those fields in August and in pasture larval counts in excess of 8000 L3/kg, emphasizing the dangers inherent to building-up of infections. In the present study, the level of 8 cm instead of 4 cm for cutting of hay, chosen because of risk of shortage of feed due to prevailing drought, did not leave the herbage sufficiently exposed to facilitate killing of infective larvae on pasture [ 13 ]. Also the contamination with Nematodirus was substantial.…”

Section: Discussionmentioning

confidence: 99%

“…This population of infective larvae gradually get killed by warm weather in spring until almost complete extinction in July whereas Nematodirus spp. larvae are more resistant to weather conditions or eggs hatch later [ 13 , 21 , 23 ]. In first year grazing heifers, a move to clean pasture without dosing has proved almost as effective as 'dose and move' [ 8 , 19 ] but repeated moves may be necessary under practical conditions [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Worm Control Strategies in Grazing Sheep in Denmark

Boa

Thamsborg²,

Kassuku

et al. 2001

Acta Vet Scand

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Boa ME, Thamsborg SM, Kassuku AA, Bøgh HO: Comparison of worm control strategies in grazing sheep in Denmark. Acta vet. Scand. 2001, 42, 57-69. -Control of nematode parasites with reduced reliance on the use of anthelmintics was studied in 16 ewes with suckling twin lambs on contaminated pasture in Denmark. Ewes and lambs were treated with albendazole at turn-out 3 May. Ewes were removed from the groups on 26 July, and lambs were slaughtered on 11 October. The animals were allocated to 4 groups of 8 lambs and their 4 ewes. Group TS was treated with albendazole at weeks 3, 6 and 8 after turnout and set-stocked; group TM was similarly treated but moved to clean pasture in conjunction with the last drenching; group US was untreated and set-stocked, and group UM was left untreated but moved to clean pasture week 8 after turn-out. Supplementary feed was offered in June and August due to scarcity of pasture. Strategic treatments of ewes and lambs weeks 3, 6 and 8 after turn-out, with or without a move to clean pasture, were highly effective in controlling nematode infections for most of the season. This was reflected in better weight gains and carcass characteristics in the treated compared to untreated lambs, resulting in an average increase in the value of the product by 36%. The effect of moving without treatment (UM) on faecal egg counts was limited but peak pasture infectivity was reduced to less than 10% compared to the set-stocked group and weight gains of lambs were significantly better despite poor feed availability in late season. The study showed that under set-stocked conditions repeated anthelmintic treatments of both ewes and lambs in early season may ensure sufficient nematode control whereas moving animals to clean pasture without dosing was less efficient. The latter may, however, still be a viable option in organic and other production systems where routine use of anthelmintics is banned, particularly if weaning and moving are combined or a second move is performed. gastrointestinal nematodes; parasite control; sheep; ruminants; grazing management.

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Winter survival of trichostrongyle larvae: a study using tracer lambs

Cited by 9 publications

References 18 publications

Prevalence and Seasonal Pattern of Caprine Trichostrongyles in a Dry Area of Central Spain

Prevalence and Seasonal Pattern of Caprine Trichostrongyles in a Dry Area of Central Spain

Substitution of benzimidazole-resistant nematodes for susceptible nematodes in grazing lambs

Comparison of Worm Control Strategies in Grazing Sheep in Denmark

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