Document Type

Article

Publication Date

9-1-2019

Journal / Book Title

Frontiers in Veterinary Science

Abstract

Chickens are a key source of nutrition for rural Malagasy communities. Due to high endemic rates of Newcastle disease, it remains challenging to raise sustainable chicken flocks as a consistent food source. Here, we explore the impact of triannual Newcastle disease virus (NDV) vaccine interventions on the growth and herd immunity acquisition of Malagasy chicken flocks. Between 2011 and 2018 we collected longitudinal data to assess the population dynamics of chicken populations in remote Malagasy communities. In 2016, we launched a pilot campaign for vaccination in six rural communities to determine the impacts on chicken survivorship and productivity. We used these data to specify a mathematical model of realistic Malagasy chicken population dynamics under a triannual vaccination regime. The mathematical model represents an extension to conventional SIR models that allows for modeling the impact of specific vaccinations on chicken flock dynamics, rather than estimation of parameters. Understanding chicken population dynamics is important for realizing the potential for domestic chicken flocks to serve as sustainable food sources. The results suggested that vaccination coverage of at least ∼40% is necessary over 5+ years to achieve population doubling, while complete herd immunity may not be possible given the short duration of effectiveness of vaccination, and the high levels of births and deaths in the chicken flocks.

DOI

10.3389/fvets.2019.00305

Rights

© 2019 Annapragada, Borgerson, Iams, Ravelomanantsoa, Crawford, Helin, Anjaranirina, Randriamady and Golden. 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.

Published Citation

Annapragada, A., Borgerson, C., Iams, S., Ravelomanantsoa, M. A., Crawford, G. C., Helin, M., Anjaranirina, E. J. G., Randriamady, H. J., & Golden, C. D. (2019). Modeling the impact of newcastle disease virus vaccinations on chicken production systems in northeastern madagascar. Frontiers in Veterinary Science, 6, 305. https://doi.org/10.3389/fvets.2019.00305

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