Retrieval of Trichostrongylus colubriformis infective larvae from grass contaminated in winter and in spring

Rocha, Rosilene Fernandes da; Bricarello, Patrízia Ana; Rocha, Gilberto Pedroso da; Amarante, Alessandro Francisco Talamini do

doi:10.1590/s1984-29612014075

Cited by 8 publications

(8 citation statements)

References 18 publications

(29 reference statements)

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“…In our conditions, during the dry season, the lack of rain may be the most important limiting factor for developing early nematode stages, because moisture is required for eggs to develop into the infective larval stage (O'Connor et al, 2006). L3 migration and survival in the environment is also greatly influenced by the climatic conditions and the pasture's microclimate (Silva et al, 2008;Santos et al, 2012;Rocha et al, 2014). Thus, L3 were only recovered when the environmental conditions favoured L3 development and survival in the pastures, which coincided with rainfall at the beginning of spring.…”

Section: Discussionmentioning

confidence: 99%

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Almeida

Piza

Bassetto

et al. 2018

Small Ruminant Research

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Lamb performance was evaluated in four integrated crop-livestock (ICL) systems. The ICL areas were previously planted with maize and marandu palisade grass in December 2013. ICL systems 1 and 2 were also seeded with pigeon pea. After harvesting in April 2014, black oats were sown in rows (ICL 1 and 3) or by broadcast seeding (ICL 2 and 4). Each ICL area was divided into 12 paddocks of 225 m 2 to be grazed by young sheep from July 23 to September 30, 2014. To determine if the pasture remained contaminated by free-living stages of sheep gastrointestinal nematodes (GIN) after approximately ten months without animals in the area, 12 worm-free "tracer" lambs (n = 3/ ICL system) grazed each ICL pasture for 14 consecutive days in July 2015 and were later housed in pens, where they remained for another 14 days. The tracer lambs acquired no worm infections, demonstrating that the area was cleared after 300 days without animals. To evaluate GIN infection and uncastrated male lamb performance, we used 60 (n = 15/ system) Poll Dorset x Corriedale (crossbred) sheep with mean body weights of 24.4 ± 3.4 kg from July to September 2015 and 48 (n = 12/ system) Texel x Corriedale sheep with body weights of 26.4 ± 3.5 kg from June to September 2016. Lambs were allocated to the following groups: Group 1 rotated on the 12 ICL1 paddocks; Group 2 rotated on the 12 ICL2 paddocks; Group 3 rotated on the 12 ICL3 paddocks; and Group 4 rotated on the 12 ICL4 paddocks. Each paddock was grazed by sheep twice for three days, with a 33-day interval between grazing. At the end of the day the lambs were supplemented with concentrate plus silage. Groups 1 and 2 received mixed silage made of maize, marandu palisade grass and pigeon pea and groups 3 and 4 received mixed silage made of maize and marandu palisade grass. Faecal and blood samples were taken from all the animals every two weeks, and body weight was recorded on the same occasion. Nematode faecal egg counts (FEC), packed cell volume and total plasma protein means did not differ (P > 0.05) between the four lamb groups. In 2015, throughout the experimental period, the FEC decreased in all animals, with 6733 and 1407 eggs per gram (EPG) on average at the beginning and end of the trial, respectively. At the beginning of the trial in 2016, the animals had mild GIN infections (1077 EPG on average), and the individual faecal egg counts did not exceed 10,000 EPG during the trial. In decreasing order, Haemonchus spp., Trichostrongylus spp. and Cooperia spp. third stage larvae were found in the faecal cultures in both years. The performance of lambs were similar in the four ICL systems (P > 0.05), in the first and second years, the daily weight gains were 0.192 ± 0.05 kg and 0.221 ± 0.06 kg, respectively. In conclusion, a period of withdrawal of contaminated sheep results in plots free of infective larvae. The use of clean pastures during the dry season, in the different ICL systems, associated with a good nutrition plan, resulted in progressively declining degrees of GIN infections and satisfactory ...

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Section: Discussionmentioning

confidence: 99%

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Almeida

Piza

Bassetto

et al. 2018

Small Ruminant Research

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“…In addition, the moderate temperatures and high relative humidity recorded throughout the experimental period enabled larvae to develop and migrate to the sward in the first 14 days. However, this rapid development of larvae also resulted in their lower survival time in the environment (Rocha et al, 2014;Carneiro & Amarante, 2008).…”

Section: Sward Heightsmentioning

confidence: 99%

Infective larvae of Haemonchus contortus found from the base to the top of the grass sward

Gasparina

Baby

Fonseca³

et al. 2021

Rev. Bras. Parasitol. Vet.

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The resistance of gastrointestinal nematodes (GIN) of sheep to anthelmintic treatment has motivated researchers to seek alternatives to reduce the use of these drugs in sheep farming and decontaminate pastureland based on knowledge about the survival dynamics of larvae. The aim of this work was to evaluate the migration of the infective larvae (L3) of Haemonchus contortus at different times of the day, strata, and sward heights, with and without shade after the deposition of contaminated sheep feces. The grass species used here was Cynodon dactylon cv. Tifton 85 in four treatments: low sward height shade; low sward height sunshine; high sward height shade; and high sward height sunshine. The number of L3 recovered from the pasture at different times of the day did not differ. The highest number of L3 recovered was in shade. The number of L3 at different times and strata occurred uniformly, confirming that L3 remain in the same place after migrating from dung at the hottest times of the day. Infective larvae of H. contortus were able to migrate across all the strata regardless of the time of day in the summer season in humid subtropical climate.

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“…Las condiciones ambientales influyen mucho en el desarrollo y la supervivencia de las etapas libres de las L3 y su migración entre los pastos de forraje. Las diferencias morfológicas entre especies forrajeras crean variaciones en los microclimas proporcionados por las plantas, y como resultado influyen en el desarrollo y la supervivencia de los huevos y las larvas de los parásitos (26) .…”

Section: Discusión Caracterización De Los Sistemas De Cría Y Los Animunclassified

“…(Brachiaria sp.) fue lo que tenía el forraje más denso, lo cual resultó en las concentraciones más bajas de L3/kg de materia seca (26) .…”

Section: Discusión Caracterización De Los Sistemas De Cría Y Los Animunclassified

Helminthiasis control in calves raised in a hot Semi-arid area

Pereira¹,

Duarte²,

Bastos³

et al. 2019

Rev. Mex. Cienc. Pecu.

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This study aimed to characterize the helminthiasis and anthelminthic effectiveness in calf herds raised in a hot semi-arid area. Sixty (60) cattle farms from the northern area of Minas Gerais, Brazilian sertão, were categorized by semi-structured questionnaires. It was also performed the fecal egg counts (FEC) reduction test to analyze the profile of anthelminthic resistance in eight herds. The study selected groups of at least 10 homogeneous calves with FEC ≥ 150 per treatment. After 12 h of fast, calf groups were treated with albendazole, levamisole, ivermectin, doramectin or abamectin, except the control groups (untreated). It was collected feces before treatments and 14 d later larvae genera of nematodes were identified after coproculture. Extensive grazing was the predominant creation system for beef calves, worming was employed every 6 mo in 64 % of the farms and macrocyclic lactones was the most frequently used anthelminthic group. The anthelminthic efficacy varied from 62 to 98.9 %. The resistance profile to ivermectin, levaminosole, albendazole and (or) doramectin verified in this research is alarming as the genus Haemonchus was the most frequent one before and after the treatments. It was detected variations in the creation systems, in control practices and in anthelminthic susceptibility profiles between herds. Therefore, this work emphasize the importance of using strategic control with FEC reduction test for choice of anthelminthic and the encouragement of practices of alternative control.

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Retrieval of Trichostrongylus colubriformis infective larvae from grass contaminated in winter and in spring

Cited by 8 publications

References 18 publications

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Infective larvae of Haemonchus contortus found from the base to the top of the grass sward

Helminthiasis control in calves raised in a hot Semi-arid area

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