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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Prev Vet Med. 2014 Mar 21;115(0):18–28. doi: 10.1016/j.prevetmed.2014.03.014

Figure 1.

Figure 1

Schematic of a compartment model for bovine tuberculosis in a cow-calf herd. Animals in compartments labeled with subscript A, C, and Y are adult breeding animals, calves, and youngstock, respectively. Animals enter the herd as calves during the calving season at rate b(t), such that all adults calve over a 3 month period, and all calves are subject to an annual death rate (μc). Susceptible animals are in S compartments, latent (exposed) animals are in E compartments, non-infectious animals that may be detected by testing are in T compartments, and infectious animals are in I compartments. Calves may enter the breeding herd at rate (ω(t)); otherwise, all calves are moved to a youngstock cohort at rate (ρ(t)). Youngstock are slaughtered as a cohort at 30 months of age.