The differentiation of the infective larvae of some common nematode parasites of cattle

1953 ◽  
Vol 1 (2) ◽  
pp. 223 ◽  
Author(s):  
RK Keith
Keyword(s):  
Differential Diagnosis ◽  
Body Length ◽  
Haemonchus Contortus ◽  
Body Width ◽  
Ostertagia Ostertagi ◽  
Infective Larvae ◽  
Nematode Parasites ◽  
Cooperia Oncophora

Studies are reported on the differential diagnosis of the infective larvae of Strongyloides papillosus, Haemonchus contortus, Ostertagia ostertagi, Trichostrongylus axei, Cooperia oncophora, C. punctata, C. pectinata, Bunostornum phlebotomum, Nematodirus sp., and Oesophagostomum (Bosicola) radiatum, all of which occur in cattle in Queensland. These larvae can be readily identified by the length and shape of the tail, assisted by body length, body width, certain head and tail structures, and by the presence or absence of a sheath. A key for the identification of the larvae is given. Photographs of the larvae are also provided to assist identification.

scholarly journals PERKEMBANGAN DAN GAMBARAN ANATOMIS LARVA INFEKTIF (L3) Haemonchus contortus YANG DIBIAKKAN DENGAN VERMICULLITE (Development and Anatomical Description of Infektive Larvae (L3) Haemonchus contortus Cultured with Vermicullite)

2016 ◽  
Vol 10 (1) ◽  
pp. 62
Author(s):  
Rahmi Sulastri Mukhtar ◽  
Muhammad Hambal ◽  
Muhammad Hanafiah ◽  
Yudha Fahrimal ◽  
Winaruddin Winaruddin ◽  
...  
Keyword(s):  
Larval Development ◽  
Body Length ◽  
Haemonchus Contortus ◽  
Tail Length ◽  
Total Body Length ◽  
Basic Information ◽  
Infective Larvae ◽  
Body Diameter ◽  
Total Body ◽  
Banda Aceh

This study was aimed at obtaining basic information about bioecology of Haemonchus contortus, related to larval development and anatomical description of infective larvae (L3). In this study, the ova of Haemonchus contortus were harvested out of the intestines of goats, those were slaughtered in municipal slaughterhouse in Kampung Jawa Banda Aceh. The ova of Haemonchus contortus were then cultured using vermiculite as media, and observed daily until the larvae reached 3rd stage larvae. The result revealed that the larvae need 7 days to reach from eggs into infective larvae. Larvae obtained has uniform morphology, with a body diameter of 22 μm, tail length up to 55 μm hyaline, esophagus posterior to the tail of 592 μm, length of esophagus anterior to posterior esophagus 145 μm, and a total body length of larvae 737 μm.

The development, composition and maintenance of experimental populations of Haemonchus contortus in sheep

Parasitology ◽  
1981 ◽  
Vol 82 (2) ◽  
pp. 257-261 ◽  
Author(s):  
W. J. Coadwell ◽  
P. F. V. Ward
Keyword(s):  
Single Dose ◽  
Population Density ◽  
Sex Ratio ◽  
Body Length ◽  
Haemonchus Contortus ◽  
Growth Curves ◽  
Dry Weight ◽  
Infective Larvae ◽  
Worm Body ◽  
Different Ages

SUMMARYClun Forest sheep, aged between 3 and 18 months and worm-free from birth, were given a single dose of 25000 infective larvae of the nematode Haemonchus contortus. The host animals were killed between 4 and 100 days after infection and the nematode populations were examined to determine size and composition. The relation between worm body length, dry weight and age was studied and growth curves were constructed. Variations in the sex ratio for infections of different ages were noted. No evidence was found for a relation between rate of growth and population density. The rate of expulsion was determined and its variability discussed.

Inhibited development in Haemonchus contortus

Parasitology ◽  
1975 ◽  
Vol 71 (2) ◽  
pp. 239-246 ◽  
Author(s):  
R. M. Connan
Keyword(s):  
Haemonchus Contortus ◽  
Primary Factor ◽  
High Rate ◽  
Environmental Stimulus ◽  
East Anglia ◽  
Ostertagia Ostertagi ◽  
Infective Larvae ◽  
Experimental Infections

Inhibited development of Haemonchus contortus was studied in single experimental infections of worm-free lambs. Chilling of the infective larvae at + 4°C was without effect on the percentage of larvae subsequently becoming inhibited and a period of exposure to autumnal conditions was unnecessary to induce a high rate of inhibition. It was concluded that seasonal inhibition of H. contortus in East Anglia is brought about primarily by an environmental stimulus acting upon the preparasitic stages but that, unlike Obeliscoides cuniculi and Ostertagia ostertagi, this was not cold. It could be provided in a culture kept in the dark at 25 °C for 12 days. While the age of the host did influence the phenomenon, in that larvae were less inclined to inhibition in very young animals, it was concluded that this was not a primary factor in the aetiology.

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