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Calculate fibre production

Source: R/core_model_production.R
calc_fibre_production.Rd

Calculates fibre production for producing cohorts (FA, FS, MA, MS) of fibre-producing species (CML, SHP, GTS) over the assessment period (kg/cohort/assessment period).

Usage

calc_fibre_production(
  species_short,
  cohort_short,
  fibre_yield_year,
  simulation_duration,
  cohort_stock_size
)

Arguments

species_short

Character. Code identifying the livestock species. Supported values include:

  • PGS: pigs

  • CML: camels

  • CTL: cattle

  • BFL: buffalo

  • SHP: sheep

  • GTS: goats

cohort_short

Character. Sex- and age-specific cohort code describing the production stage of the animals. Supported values include:

  • FA: adult females (from age at first parturition)

  • FS: sub-adult females (from weaning to age at first parturition)

  • FJ: juvenile females (from birth to weaning)

  • MA: adult males (from age at first breeding)

  • MS: sub-adult males (from weaning to age at first breeding)

  • MJ: juvenile males (from birth to weaning)

fibre_yield_year

Numeric. Annual production yield of fibre, such as wool, cashmere, mohair (kg/head/year). Required only for species = CML, SHP, and GTS.

simulation_duration

Numeric. Length of the assessment period (days).

cohort_stock_size

Numeric. Average population size in each of the 6 sex–age cohorts (# heads). (cohorts=FJ, FS, FA, MJ, MS, MA).

Value

Numeric. Total fibre produced over the assessment period by cohort (kg /cohort/assessment period).

Details

Fibre production outputs are computed as follows:

\(fibre\_production = \frac{fibre\_yield\_year}{365} \times simulation\_duration \times cohort\_stock\_size\)

Non-zero fibre outputs are only expected for producing cohorts (FA, FS, MA, MS) of fibre-producing species (CML, SHP, GTS).

This function is part of the run_production_module().

See also

run_production_module