Effects of time of day, season and stratum on Haemonchus contortus and Haemonchus placei third-stage larvae on irrigated pasture
The effect of time of day, season and stratum of herbage and soil on the availability of Haemonchus contortus and Haemonchus placei third-stage larvae (L 3) on pasture was assessed. Feces from infected calves and lambs were placed on pasture plots and samples of upper herbage, lower herbage, mat and...
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Published in | Veterinary parasitology Vol. 40; no. 1; pp. 87 - 98 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Netherlands
Elsevier B.V
01.10.1991
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Subjects | |
Online Access | Get full text |
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Summary: | The effect of time of day, season and stratum of herbage and soil on the availability of
Haemonchus contortus and
Haemonchus placei third-stage larvae (L
3) on pasture was assessed. Feces from infected calves and lambs were placed on pasture plots and samples of upper herbage, lower herbage, mat and soil were collected at five intervals per day throughout the daylight hours on 18 sample days over 12 months. Using recovery rate factors derived from a preliminary investigation on the efficacy of larval recovery from each stratum, the data on larval recoveries were analyzed for the effect of season, time and stratum, and their interactions. Significant (
P < 0.05) differences were found for season, stratum and the season-with-stratum interaction for both parasites. No significant differences were detected for larval counts at different times of the day. Larval recoveries of
H. contortus were larger throughout the study than those of
H. placei. Most
H. contortus L
3 were recovered in the summer and autumn, and
H. placei in the spring and summer. For both parasites, the recoveries of larvae from the upper and lower herbage were larger than those from the mat and soil. The implications of these findings are discussed in terms of control strategies. |
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Bibliography: | L72 9109092 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0304-4017 1873-2550 |
DOI: | 10.1016/0304-4017(91)90085-A |