Original Research

Epidemiology and effect of gastrointestinal nematodes on dairy goats in Argentina

Victor H. Suarez, Gabriela M. Martínez, Alberto E. Viñabal, José R. Alfaro
Onderstepoort Journal of Veterinary Research | Vol 84, No 1 | a1240 | DOI: https://doi.org/10.4102/ojvr.v84i1.1240 | © 2017 Victor H. Suarez, Gabriela M. Martínez, Alberto E. Viñabal, José R. Alfaro | This work is licensed under CC Attribution 4.0
Submitted: 29 April 2016 | Published: 28 February 2017

About the author(s)

Victor H. Suarez, Instituto Nacional de Tecnología Agropecuaria – AISA-IIACS, Centro de Investigaciones Agropecuarias, Argentina
Gabriela M. Martínez, Instituto Nacional de Tecnología Agropecuaria – AISA-IIACS, Centro de Investigaciones Agropecuarias, Argentina
Alberto E. Viñabal, Instituto Nacional de Tecnología Agropecuaria – AISA-IIACS, Centro de Investigaciones Agropecuarias, Argentina
José R. Alfaro, Instituto Nacional de Tecnología Agropecuaria – AISA-IIACS, Centro de Investigaciones Agropecuarias, Argentina

Abstract

The aim of this work was to study the epidemiology and harmful effects of gastrointestinal nematodes (GINs) on dairy goats maintained in an intensive system. Two groups of goats were studied: untreated group (UG) (subdivided into UGjun goats that kidded in June, and UGjul goats that kidded in July) and treated group (TG) (with no subgroups, treated with monepantel: 3.75 mg/kg, orally, monthly). Eggs per gram (epg) in faeces were counted, faecal culture was performed to differentiate nematode genera and milk production was measured. Differences between groups were compared using least squares means analysis of variance (milk production and milking period length) and Kruskal–Wallis test (faecal egg counts). Nematode infection was moderate, with Haemonchus and Trichostrongylus being the dominant genera; the faecal egg counts reached the level of 2000 only once throughout the study. Goats that kidded in June had higher egg count after parturition (UGjun = 1564 epg), with significant differences (p < 0.04) from those that still had not kidded (UGjul = 962 epg). Over the entire trial period, the mean total milk production of TG (399.5 L ± 34.0 L) was significantly higher (p < 0.05) than that of UG (281.6 L ± 37.5 L), representing an increase of 41.8% in total milk yield. The results of this study show a post-partum peak in egg count and a negative effect of GINs on milk yield, even with moderate infections.

Keywords

dairy goat; gastrointestinal nematodes; production effect; northwestern Argentina

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