Effect of plant trichomes on the vertical migration of <Emphasis Type="Italic">Haemonchus contortus</Emphasis> infective larvae on five tropical forages |
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| Authors: | Aruaque L F Oliveira Ciniro Costa Roberto A Rodella Bruna F Silva Alessandro F T Amarante |
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| Institution: | Departamento de Parasitologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP, Brazil. |
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| Abstract: | The influence of trichomes on vertical migration and survival of Haemonchus contortus infective larvae (L3) on different forages was investigated. Four different forages showing different distributions of trichomes
(Brachiaria brizantha cv. Marandu, Brachiaria brizantha cv. Xaraes, Andropogon gayanus, and Stylosanthes spp.), and one forage species without trichomes (Panicum maximum cv. Tanzania), were used. Forages cut at the post-grazing height were contaminated with faeces containing L3. Samples of
different grass strata (0–10, 10–20, >20 cm) and faeces were collected for L3 quantification once per week over four weeks.
In all forages studied, the highest L3 recovery occurred seven days after contamination, with the lowest recovery on A. gayanus. In general, larvae were found on all forages’ strata. However, most of the larvae were at the lower stratum. There was no
influence of trichomes on migration and survival of H. contortus L3 on the forages. |
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| Keywords: | Moisture film Trichomes Vertical migration Nematode Grass |
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