The topology of between-herd cattle contacts in a mixed farming production system in western Kenya

Ogola, J., Fevre, E.M., Gitau, G.K., Christley, R., Muchemi, G. and de Glanville, W.A. (2018) The topology of between-herd cattle contacts in a mixed farming production system in western Kenya. Preventive Veterinary Medicine, 158, pp. 43-50. (doi: 10.1016/j.prevetmed.2018.06.010) (PMID:30220395) (PMCID:PMC6152584)

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Abstract

In many livestock production systems in sub-Saharan Africa, cattle are owned by individual keepers but regularly mix with animals from other herds while grazing communal land, at watering points or through the use of shared bulls for breeding and ploughing. Such contacts may have important implications for disease transmission and control but are not well documented. We describe between-farm contacts in Kimilili sub-county of Bungoma County, a mixed farming area of predominately smallholder farmers. Between-farm contacts occurring during grazing or at shared water points over the past four weeks were captured in seven randomly selected villages using a photo-elicitation tool. The use of shared bulls for breeding and ploughing and cattle introductions from farms within the same village in the past 12 months were also captured. Contact networks were constructed for each contact type in each village. In total 329 farms were included in the study. Networks resembled undirected scale-free graphs with a network density ranging between 9.6 and 14.0. Between 45.6 and 100 of the farms in each study village had been in contact over the past four weeks through grazing and watering contacts. Between 88.9 and 100 were considered to have been in contact over the past 12 months. The topology of the networks was heterogeneous, with some farms exhibiting a high degree of contact. The degree of farm contact and distances between farms were negatively correlated (Pearson correlation coefficient range −0.2 to −0.4). Effective disease control and surveillance must take into consideration the frequency and range of contacts that occur between farms within a single village. Cattle keepers are highly interconnected and pathogens that are transmitted through direct or indirect animal contact would be expected to spread rapidly in the study system. However, the observed heterogeneity in between-farm contact may present opportunities for interventions to be targeted to particular herds to limit infectious disease spread.

Item Type:Articles
Additional Information:This project was funded by The Wellcome Trust, grant number 085308 and The Biotechnology and Biological Sciences Research Council, Department for International Development, the Economic & Social Research Council, the Medical Research Council, the Natural Environment Research Council and the Defence Science & Technology Laboratory, under the Zoonoses and Emerging Livestock Systems (ZELS) programme, grant reference BB/L019019/1. WAdeG was funded by a UK BBSRC DTG. This work also received support from the CGIAR Research Program on Agriculture for Nutrition and Health (A4NH), led by the International Food Policy Research Institute (IFPRI). We also acknowledge the CGIAR Fund Donors (https://www.cgiar.org/funders).
Keywords:Topology, heterogeneity, networks, smallholder.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:De Glanville, Dr William
Authors: Ogola, J., Fevre, E.M., Gitau, G.K., Christley, R., Muchemi, G., and de Glanville, W.A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Preventive Veterinary Medicine
Publisher:Elsevier
ISSN:0167-5877
ISSN (Online):1873-1716
Published Online:06 July 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Preventive Veterinary Medicine 158: 43-50
Publisher Policy:Reproduced under a Creative Commons License

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