Susceptibility of hair sheep ewes to nematode parasitism during pregnancy and lactation in a selective anthelmintic treatment scheme under tropical conditions

Research in Veterinary Science
R González-GarduñoA J Chay-Canul

Abstract

The objective was to determine the influence of year, season and age of hair sheep ewes on their susceptibility to gastrointestinal nematodes during pregnancy and lactation and to record the number of treatments within a selective anthelmintic (AH) treatment programme. A trial was performed with 46 grazing ewes kept in hot humid tropical conditions. Data included: average daily weight gain (ADG, kg), packed cell volume (PCV, %) and nematode eggs per gram of faeces (EPG) obtained during 2 years (2009 and 2011-2012). Ewes reaching 1000 EPG were treated with AH. Irrespective of year, season and age, ewes were more susceptible to GIN during lactation (higher EPG, lower PCV and net weight loss) and less susceptible during gestation (lower EPG, higher PCV and net weight gain). As a result, 24.4% of the ewes were left untreated during lactation, while 63.0% of the ewes needed no AH treatment during pregnancy. Even under the hot humid tropical conditions of the farm, the individual EPG helped to maintain a considerable proportion of animals without an AH treatments within the flock.

References

Jan 24, 2006·Veterinary Parasitology·G C ColesJ Vercruysse
Apr 6, 2006·Journal of Veterinary Internal Medicine·Sherrill A FlemingMike Rings
Apr 24, 2012·Veterinary Parasitology·J F J Torres-AcostaJ A Cuéllar-Ordaz

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Citations

Aug 16, 2016·Tropical Animal Health and Production·Jovanny Gaspar Palomo-CouohJuan Gabriel Magaña-Monforte
Aug 1, 2019·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Mariana P BertonFernando Baldi
Jan 14, 2020·American Journal of Primatology·Laurence R GesquiereElizabeth A Archie
Nov 14, 2015·Tropical Animal Health and Production·Javier Arece-GarcíaCarine Marie-Magdeleine
Nov 21, 2020·Tropical Animal Health and Production·Johnny Iglesias Mendes AraujoJosé Lindenberg Rocha Sarmento
Apr 27, 2021·International Journal for Parasitology. Parasites and Wildlife·Bobby HabigSteffen Foerster
Jul 28, 2017·Research in Veterinary Science·Maria Angela Machado FernandesAlda Lucia Gomes Monteiro

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Anthelmintics (ASM)

Anthelmintics or antihelminthics are a group of antiparasitic drugs that expel parasitic worms (helminths) and other internal parasites from the body by either stunning or killing them and without causing significant damage to the host. Discover the latest research on anthelmintics here.

Anthelmintics

Anthelmintics or antihelminthics are a group of antiparasitic drugs that expel parasitic worms (helminths) and other internal parasites from the body by either stunning or killing them and without causing significant damage to the host. Discover the latest research on anthelmintics here.