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

Gasparina, Jennifer Mayara; Baby, Renata Grasieli; Fonseca, Lidiane; Bricarello, Patrízia Ana; Rocha, Rosilene Fernandes da

doi:10.1590/s1984-29612021032

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…(2.9%). However, in contrast to GASPARINA et al (2021), there was a smaller discrepancy between the relative frequencies of H. contortus and Trichostrongylus sp. (93.1:4.6 and 58.4:37.3, respectively).…”

Section: Discussionmentioning

confidence: 83%

Agro-industrial residues in the control of gastrointestinal nematodes of small ruminants and fertilization of forages

et al. 2023

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Verminosis in small ruminants can render rural activity impractical, which is still controlled through the administration of anthelmintics. The present study evaluated four agro-industrial residues as fertilizer in the control of GIN of small ruminants in the free-living stage. Crab shell, manipueira, biochar, and organomineral residues were used in pots (5.0 kg of soil) and cultivated with Massai grass (Megathyrsus maximum cv. Massai). Further, the pots were contaminated with feces from sheep carrying a natural multispecific infection by GIN. Next, the residues were applied individually to the soil, with 50 mL/pot for liquid and 50 g/pot for solid residues. Treatment with manipueira showed the lowest number of L3.kg MS-1 recovered from the grass (202.44), when compared with treatments using organomineral (823.89) and biochar (689.34). However, there was no statistically significant difference (P < 0.05) between the four treatments as compared to the control group. These agro-industrial residues can be used as organic fertilizers; however, these will not help in the control of GIN in sheep.

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Section: Discussionmentioning

confidence: 83%

Agro-industrial residues in the control of gastrointestinal nematodes of small ruminants and fertilization of forages

et al. 2023

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“…Conversely, with a restriction on humidity, the larvae tend to remain in the feces or at the base of the plant (Silva et al, 2008;Santos et al, 2012). However L3 H.contortus are able to migrate across all the strata the summer season in humid subtropical climate (Gasparina et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Dung avoidance behavior in Crioula Lanada lambs naturally infected with gastrointestinal nematodes in a rotational pasture system

Bricarello

Costa

Longo

et al. 2022

Rev. Bras. Parasitol. Vet.

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This study aimed to evaluate foraging distance (FD) from the dung, parasitological and physiological factors in 18 Crioula Lanada lambs naturally infected by nematodes with three infection levels (IL) in a Voisin Grazing System. In the pre-experimental phase animal feces collection, deworming, observer training, animal adaptation and dung demarcation were carried out; in the experimental phase, grazing distance, feces, pasture and blood sampling. An initial exploratory analysis was carried out (Kruskal-Wallis test). Fixed predictors were selected with a cumulative logit regression model; an ordinal logistic regression mixed model identified influencing factors of ordinal responses for (i) FD, (ii) infective larvae quantity (L3). Animals approached the dung when the radiation or temperature were more intense (P < 0.05). Paddock entry/exit, IgG and L3 influenced FD over time (P < 0.05). L3, in turn, was influenced by IL, FEC and corpuscular volume (CV). In the High IL group, FD varied between 60-100 cm. Greater L3 and FEC were found in the High and Low IL from the 4th week (P < 0.05). Naturally infected Crioula Lanada lambs increased the distance from the dung, which was not related to IL but to the dynamics of solar radiation and parasitological and immunological factors.

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“…In Lages/SC in southern Brazil, no eggs were found in sheep faeces 10 days after deposition and larvae were found in faeces up to 55 days after deposition during spring (Souza et al, 2000), demonstrating a much longer period of permanence in the faecal bolus. It is possible that in the coastal climate of Florianópolis/SC the eggs hatched and migrated quickly; however survival was short, probably as a consequence of greater energy expenditure and greater contact with solar radiation on top of the forages (Crofton, 1948; Santos et al, 2012; Leathwick, 2013; Gasparina et al, 2021).…”

Section: Discussionmentioning

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

Cited by 3 publications

References 31 publications

Agro-industrial residues in the control of gastrointestinal nematodes of small ruminants and fertilization of forages

Agro-industrial residues in the control of gastrointestinal nematodes of small ruminants and fertilization of forages

Dung avoidance behavior in Crioula Lanada lambs naturally infected with gastrointestinal nematodes in a rotational pasture system

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

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