Recovery of Trichostrongylus colubriformis infective larvae from three grass species contaminated in the autumn

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

doi:10.1590/s1984-29612012000400006

Cited by 9 publications

(8 citation statements)

References 16 publications

(21 reference statements)

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“…In an experiment conducted with the same tropical forage plants, Carneiro and Amarante (2008) also retrieved larger numbers of L3 of H. contortus from feces deposited in tall grass. Similar findings were reported in a study using the same grasses, when contamination by T. colubriformis was performed in summer (ROCHA et al, 2008) and autumn (ROCHA et al, 2012). This fact demonstrates that the greater pasture forage mass probably provided a more favorable microclimate for the development and survival of larvae in grass.…”

Section: Springsupporting

confidence: 88%

“…The number of L3 retrieved from pastures in a study by Rocha et al (2012) was also not influenced by plant height, except in Brachiaria and Aruana grasses, in which the largest number of L3 were retrieved from high cut grasses in week 4 after contamination of the grass species with feces containing T. colubriformis eggs.…”

Section: Springmentioning

confidence: 82%

“…They were kept immersed in 4 L of water for four hours. After that, each herbage sample was transferred to another bucket containing 4 L of water, remaining immersed for further three hours (NIEZEN et al, 1998a;ROCHA et al, 2012). After the period of immersion, the grass samples were removed, placed in paper bags and oven-dried to calculate the weight of dry matter.…”

Section: Retrieval Of L3 From Grass and Fecal Samplesmentioning

confidence: 99%

“…Several control alternatives have been searched, including studies on the population dynamics and location of infective larvae (L3) in different forage grasses commonly used in sheep farming (NIEZEN et al, 1998a, b;ROCHA et al, 2008ROCHA et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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

Rocha

Bricarello

Rocha

et al. 2014

Rev. Bras. Parasitol. Vet.

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The survival of infective larvae (L3) of Trichostrongylus colubriformis was evaluated on Brachiaria, Coast-cross and Aruana forage grasses. Feces of sheep parasitized exclusively by T. colubriformis were deposited in winter and spring on experimental plots whose grasses were cut at two heights: 5 cm and 30 cm. One, two, four, eight, 12 and 16 weeks after depositing the feces, fecal and forage samples were collected for the retrieval and quantification of L3. Retrieval of L3 from feces and forage was negligible in winter due to the dry weather, although a few larvae were retrieved in the last larval collections. However, L3 retrieval from fecal samples was greater in spring, especially two weeks after feces were deposited on 30 cm high grasses. At this time, the L3 retrieval rate from the three forage grasses differed significantly (P <0.05), with Aruana grass showing the highest average L3 retrieval rate, followed by Coast-cross and Brachiaria. In conclusion, the winter drought proved very unfavorable for the presence of L3 in the environment, and the microclimate of Aruana pastureland was generally the most favorable for the retrieval of infective larvae.Keywords: Sheep, nematodes, epidemiology, Brachiaria decumbens, Panicum maximum, Cynodon dactylon. ResumoA sobrevivência de larvas infectantes (L3) de Trichostrongylus colubriformis foi avaliada em pastagem de Braquiária, Coast-cross e Aruana. Fezes de ovinos parasitados exclusivamente por T. colubriformis foram depositadas no inverno e na primavera em parcelas experimentais com duas alturas de corte da forragem, 5 cm e 30 cm. Uma, duas, quatro, oito, 12 e 16 semanas após o depósito, amostras de fezes e de forragem foram coletadas para a recuperação e quantificação de L3. Devido à seca no inverno, a recuperação de L3 das fezes e da forragem foi ínfima, embora tenha havido recuperação de algumas larvas nas últimas coletas. Por outro lado, na primavera houve maior recuperação de L3 das amostras, especialmente duas semanas após a deposição das fezes em meio às pastagens com 30 cm de altura. Nesse momento, houve diferença significativa (P<0,05) entre as três forrageiras, com maior média de L3 no capim Aruana, seguido de Coast-cross e Braquiária. Em conclusão, a seca registrada no período de inverno se mostrou bastante desfavorável à presença de L3 no ambiente e, de forma geral, o microclima da pastagem de Aruana foi o que mais favoreceu a recuperação de larvas infectantes.

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Section: Springsupporting

confidence: 88%

Section: Springmentioning

confidence: 82%

Section: Retrieval Of L3 From Grass and Fecal Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Rocha

Bricarello

Rocha

et al. 2014

Rev. Bras. Parasitol. Vet.

Self Cite

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“…The L3 were recovered from the pasture, soil and faeces using the Baermann technique, with adaptations by Niezen et al (1998b) and Rocha et al (2008).…”

Section: Collection Of Pasture Faeces and Soilmentioning

confidence: 99%

Effect of growing forage legumes on the migration and survival in the pasture of gastrointestinal nematodes of sheep

et al. 2022

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In order to identify types of forage that inhibit pasture contamination, an evaluation was performed of the effect of the forage legumes Trifolium repens (white clover), Trifolium pratense (red clover) and Lotus corniculatus (bird's-foot-trefoil) on the survival and migration of infective larvae (L3) of gastrointestinal nematodes (GIN) of sheep. An experimental area of 441 m2 was divided into four blocks, subdivided into areas of 1.20 × 1.20 in which the three forage legumes were separately overseeded. After growth of the forage in each subdivision, experimental units were established that were later artificially contaminated with sheep faeces containing GIN eggs. Between October and December 2018, pasture, faecal and soil samples were collected on four occasions during weeks 1, 2, 4 and 8 after the deposition of faeces. In week 6, the forage legumes in all the experimental units were mown to simulate grazing. The number of L3 was quantified to determine their survival in the pasture, faeces and soil. In addition, the horizontal migration of L3 was measured at two distances from the faecal pellets (10 and 30 cm), as well as their vertical migration at two heights of the plant stems, that is, lower half and upper half. Larvae vertical migration was affected by the forage species (P < 0.001), in that bird's-foot-trefoil contained fewer larvae in the upper stratum. Bird's-foot-trefoil restricted the migration of L3 to the upper stratum of the plant, which could potentially decrease the risk of infection by intestinal nematodes in grazing sheep.

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Extruded urea levels in lamb supplementation in rainy tropical savanna conditions: the triad host-gastrointestinal nematodes-environment

Roberto

Difante

Costa

et al. 2023

Trop Anim Health Prod

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Recovery of Trichostrongylus colubriformis infective larvae from three grass species contaminated in the autumn

Cited by 9 publications

References 16 publications

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

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

Effect of growing forage legumes on the migration and survival in the pasture of gastrointestinal nematodes of sheep

Extruded urea levels in lamb supplementation in rainy tropical savanna conditions: the triad host-gastrointestinal nematodes-environment

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