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Table 1 Adaptations made to the original cow model to obtain the goat model

From: Dairy goat demography and Q fever infection dynamics

Characteristic Cow model Goat model
Herd size 50 770
Birth-birth interval 55 weeks 52 weeks
Birth season year-round 12 weeks
Gestation period 40 weeks 21 weeks
Non-gestation period 15 weeks 31 weeks
Dry period 8 weeks -
Young animals no heifers in the model includes youngstock
Environment 2 environments 1 environment
Replacement rate (year-1) 0.355 0.305
Culling rate (week-1) Lactation or age 1 0.0057 0.0029
  Lactation or age 2 0.0052 0.0029
  Lactation or age 3 0.0065 0.0029
  Lactation or age 4 0.0067 0.0136
  Lactation or age 5&6 0.0161 0.0136
  Lactation or age 7&8 NA 0.0136
Probability distribution of the lactation numbers (for cows) or age (for goats) at the start of simulation Lactation or age 1 0.337 0.285
  Lactation or age 2 0.252 0.245
  Lactation or age 3 0.173 0.211
  Lactation or age 4 0.11 0.136
  Lactation or age 5 0.088 0.067
  Lactation or age 6 0.04 0.033
  Lactation or age 7 NA 0.016
  Lactation or age 8 NA 0.008
Infection from the environment   p = 1 – exp(−E(t)) p = 1 – exp(−Ê(t)/N)
Quantity of bacteria released by shedders in low, mid and high levels respectively, expressed in dimensionless units.   1, 1/30, or 1/3000 1*50, (1/30)*50, or (1/3000)*50
Probability of abortion   0.02 0.02*(40/21)
  1. Description of the model parameters that were adapted in the original cattle model to obtain the default goat model. Parameter definitions and values for the epidemiological model can be found in Additional file 1.