Calculate feed digestibility fraction

Calculates species-specific feed digestibility fractions by feed component.

Usage

calc_feed_digestibility_fraction(
  feed_digestible_energy_ruminant,
  feed_digestible_energy_pigs,
  feed_gross_energy
)

feed_digestible_energy_ruminant: Numeric. Digestible energy content of a feed component for ruminants, representing the energy absorbed by the animal after fecal losses (MJ/kg DM).
feed_digestible_energy_pigs: Numeric. Digestible energy content of a feed component for pigs, representing the energy absorbed by the animal after fecal losses (MJ/kg DM).
feed_gross_energy: Numeric. Gross energy content of a feed component, representing the total chemical energy released upon complete combustion of the feed (MJ/kg DM).

List with elements:

feed_digestibility_fraction_ruminant: Numeric. Digestibility of a feed component for ruminants, expressed as the ratio of digestible energy to gross energy content (fraction).
feed_digestibility_fraction_pigs: Numeric. Digestibility of a feed component for pigs, expressed as the ratio of digestible energy to gross energy content (fraction).

Digestibility is computed as the ratio of usable energy to gross energy: $$feed\_digestibility\_fraction = usable\_energy / feed\_gross\_energy$$

For ruminants and pigs, usable energy is represented by digestible_energy (DE), which accounts for fecal energy losses.

This function is part of the run_ration_quality_module().