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Calculate daily ration intake in dry matter

Source: R/core_model_metabolic_energy_req.R
calc_ration_intake.Rd

Calculates daily feed intake as dry matter intake (DMI) per animal (kg DM/head/day) from the animal's daily energy requirement and the diet energy density.

Usage

calc_ration_intake(
  species_short,
  metabolic_energy_req_total,
  ration_gross_energy,
  ration_metabolizable_energy
)

Arguments

species_short

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

  • PGS: pigs

  • CML: camels

  • CTL: cattle

  • BFL: buffalo

  • SHP: sheep

  • GTS: goats

metabolic_energy_req_total

Numeric. Total daily energy requirement (MJ/head/day). For CTL, BFL, SHP and GTS this is expressed as gross energy intake requirement (GE). For CML and PGS the function returns the summed daily metabolizable energy requirement.

ration_gross_energy

Numeric. Average gross energy content of the diet (MJ/kg DM).

ration_metabolizable_energy

Numeric. Average metabolizable energy content of the diet (MJ/kg DM).

Value

Numeric. Average daily dry matter intake of feed (kg DM/head/day).

Details

This function follows the IPCC Tier 2 framework. DMI is computed by dividing the appropriate daily energy requirement by the corresponding diet energy content (MJ/kg DM).

  • Energy expressed as gross energy intake requirement - CTL, BFL, SHP, GTS:

    $$ ration\_intake = \frac{metabolic\_energy\_req\_total}{ration\_gross\_energy} $$

  • Energy expressed as metabolizable energy requirement - CML, PGS:

    $$ ration\_intake = \frac{metabolic\_energy\_req\_total}{ration\_metabolizable\_energy} $$

This function is part of the run_metabolic_energy_req_module().

References

IPCC. (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Volume 4 (AFOLU), Chapter 10: Emissions from Livestock and Manure Management.

IPCC. (2019). 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Volume 4 (AFOLU), Chapter 10: Emissions from Livestock and Manure Management.

See also

run_metabolic_energy_req_module, calc_total_metabolic_energy_req calc_ration_gross_energy calc_ration_metabolizable_energy