PMID: 9637217Jun 24, 1998Paper

The effect of different infection levels on acquired resistance to gastrointestinal nematodes in artificially infected cattle

Veterinary Parasitology
E ClaereboutA Dereu

Abstract

The objective of this study was to evaluate the effect of different infection levels of Ostertagia ostertagi and Cooperia oncophora in a simulated 'first grazing season' on the resistance of calves to an artificial challenge infection. The infection levels were determined by the infection schedules and the chemoprophylaxis used. Thirty six 7-11-month old Holstein-Friesian bull calves were randomly divided into four groups. The animals of group B received an ivermectin sustained release bolus (ISRB) on day 0. The calves of group D were treated on days 0 and 56 with a subcutaneous injection of doramectin (0.2 mg kg(-1) BW). Group C was the untreated control group. The calves of group N were used as helminth-naive controls, while the animals of groups B, C and D were trickle infected for 24 weeks. The infection schedules were designed to simulate the expected infection pattern for each treatment group under set-stocked conditions in temperate climate areas. After the last infection, all animals were treated with oxfendazole. One week later, all animals received a challenge infection of 50,000 O. ostertagi L3 and 100,000 C. oncophora L3, spread over 10 consecutive days. During the primary infection period the faecal egg output and ...Continue Reading

References

Feb 1, 1987·International Journal for Parasitology·J Bogan, J Armour
Jun 1, 1985·Veterinary Parasitology·F H BorgsteedeH Van Tarrij
Jul 1, 1993·Veterinary Parasitology·A J WeatherleyN C Hammet
Aug 1, 1996·International Journal for Parasitology·R L Coop, P H Holmes
Jan 1, 1994·Parasitology Today·J VercruysseE Claerebout

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Citations

Feb 27, 1999·International Journal for Parasitology·J Vercruysse, P Dorny
Jun 13, 2015·Royal Society Open Science·Naomi J FoxMichael R Hutchings
Nov 11, 2017·Transboundary and Emerging Diseases·J CharlierE Claerebout

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