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Front. Vet. Sci. | doi: 10.3389/fvets.2018.00295

Comparison of three methods to assess the potential for bushpig-domestic pig interactions at the livestock- wildlife interface in Uganda

  • 1Makerere University, Uganda
  • 2Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), South Africa
  • 3VetAgro Sup, France
  • 4Claude Bernard University Lyon 1, France
  • 5Swedish University of Agricultural Sciences, Sweden
  • 6National Veterinary Institute, Sweden
  • 7Centre de coopération internationale en recherche agronomique pour le développement (CIRAD), France

Bushpigs (Potamochoerus larvatus) are considered a nuisance to farmers because of their crop raiding habits. Through their incursions into farmlands, they may interact with free-ranging domestic pigs and potentially cause transmission of infectious diseases such as African Swine Fever (ASF). The role of the bushpig in the epidemiology of ASF is poorly known and one of the gaps of knowledge is precisely the nature of interaction between bushpigs and domestic pigs. Thus, in this study, we investigated the frequency of bushpig visits to crop fields in rural communities where ASF is endemic, at the edge of a wildlife protected area in northwestern Uganda, to better understand the potential for interaction and disease transmission. We used three methods (questionnaires, observations for tracks, and camera traps) to assess bushpig visits to farmland. These methods were implemented concurrently in 28 farms during rainy and dry seasons. The results obtained by each of the three methods were analyzed by generalized linear mixed models. Potential risk factors including crop type, season and landscape characteristics related to bushpig ecology were tested as explanatory variables. A generalized linear model and the Kendall test were used to compare the results and consistency of the frequency values obtained by the three methods.
A high percentage (75%) of interviewed farmers reported visits from bushpigs in 29.6% of assessed crops (n=145), and a frequency of 0.014 +/- 0.05 visits per night was obtained through camera-trapping. Bushpig tracks were detected in 36% of sessions of observation. Cassava (Manihot esculenta) and groundnut (Arachis hypogaea L.) crop fields were the most visited, and these visits were more common during the rainy than the dry season. Distances from crop sites to the boundary of the protected area and to the river also influenced visit frequency. Camera-trapping was the least sensitive method while questionnaires and track observations presented consistent and complementary results to characterize spatial and temporal visits of bushpig into the crop fields. Evidence from our study shows that when used in combination, these methods can provide useful data to improve our understanding of the interactions between bushpigs and domestic pigs at the domestic-wildlife interface.

Keywords: interface, bushpig, African Swine Fever, questionnaire, Track observation, Camera-trap

Received: 31 Jul 2018; Accepted: 02 Nov 2018.

Edited by:

Timothée Vergne, Ecole Nationale Vétérinaire de Toulouse, France

Reviewed by:

GUSTAVO MACHADO, North Carolina State University, United States
Richard A. Kock, Royal Veterinary College (RVC), United Kingdom  

Copyright: © 2018 Payne, Ogweng, Ojok, Etter, Gilot, Masembe, Ståhl and Jori. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: DVM, PhD. Ariane Payne, Makerere University, Kampala, Uganda,