RUFAS.biophysical.animal.digestive_system.enteric_methane_calculator module

class RUFAS.biophysical.animal.digestive_system.enteric_methane_calculator.EntericMethaneCalculator

Bases: object

static calculate_calf_methane(methane_model: str | None, body_weight: float) → float

Calculates the amount of methane emission for calf.

Notes

[AN.MET.4]

Parameters

methane_model: str | None

Methane model used for methane emission calculations, including Mutian, Mills, IPCC.

body_weight: float

Body weight of the current animal, kg.

Returns

float

The amount of methane emission for calf (g/day).

References

(Pattanaik et al., 2003)

static calculate_heifer_methane(methane_model: str | None, nutrition_supply: NutritionSupply) → float

Calculates the amount of methane emission for heifer.

Notes

Soluble residue: [AN.MET.1] Gross energy concentration: [AN.MET.2] Starch to acid detergent fiber concentration ratio: [AN.MET.3] Enteric methane emission: [AN.MET.5]

Parameters

methane_model: str

Methane model used for methane emission calculations, including IPCC.

nutrition_supply: NutritionSupply

Amounts of nutrients in pen ration, calculated per animal, see Notes section for units.

Returns

float

Amount of methane emission for heifer (g/day).

References

(IPCC tier 2, 2006)

static calculate_cow_methane(is_lactating: bool, body_weight: float, milk_fat: float, metabolizable_energy_intake: float, nutrient_amounts: NutritionSupply, methane_mitigation_method: str, methane_mitigation_additive_amount: float, methane_model: str) → float

Calculates the daily enteric emissions for cows.

Notes

The dry matter (“dm”) unit is kg per animal. Crude protein (“CP”), ADF, NDF, lignin, ash, phosphorus, potassium, and nitrogen (“N”) are all percentages of dry matter.

Parameters

body_weight: float

Body weight of the current cow (kg).

methane_model: str

Methane model used for methane emission calculations, including “Mutian”, “Mills”, “IPCC”.

is_lactating: bool

Indicator of cow’s lactating status.

milk_fat: float

Milk fat, % of milk.

metabolizable_energy_intake: float

Metabolizable energy intake, Mcal/kg dry matter.

nutrient_amounts: NutritionSupply

Amounts of nutrients in pen ration, calculated per animal, see Notes section for units.

methane_mitigation_method: str

The name of the methane mitigation feed additives. The accepted names are

‘3-NOP’, ‘Monensin’, ‘Essential Oils’, and ‘Seaweed’.

methane_mitigation_additive_amount: float

The dosage of the feed additive, mg/kg DMI.

Returns

float

The daily enteric emissions for cows (g/day).

static _calculate_lactating_cow_enteric_methane(body_weight: float, milk_fat: float, metabolizable_energy_intake: float, nutrient_amounts: NutritionSupply, methane_model: str) → float

Calculates the daily enteric emissions for lactating cows.

Notes

Soluble residue: [AN.MET.1] Gross energy concentration: [AN.MET.2] Starch to acid detergent fiber concentration ratio: [AN.MET.3] Enteric methane emission, Mutian Model: [AN.MET.6] Enteric methane emission, Mills Model: [AN.MET.7] Enteric methane emission, IPCC Model: [AN.MET.5]

The dry matter (“dm”) unit is kg per animal. Crude protein (“CP”), ADF, NDF, lignin, ash, phosphorus, potassium, and nitrogen (“N”) are all percentages of dry matter.

Parameters

body_weight: float

Body weight of the current cow (kg).

milk_fat: float

Milk fat (from animal input), % of milk.

metabolizable_energy_intake: float

Metabolizable energy intake, Mcal/kg dry matter.

nutrient_amounts: Dict[str, float]

Amounts of nutrients in pen ration, calculated per animal, see Notes section for units.

Returns

float

The daily enteric emissions for lactating cows (g/day).

References

(Niu et al., 2018; Mills et al., 2003; IPCC, 2006)

static _calculate_dry_cow_enteric_methane(methane_model: str, metabolizable_energy_intake: float, nutrient_amounts: NutritionSupply) → float

Calculates the daily enteric methane emissions for dry cows.

Notes

Soluble residue: [AN.MET.1] Gross energy concentration: [AN.MET.2] Starch to acid detergent fiber concentration ratio: [AN.MET.3] Enteric methane emission, Mills Model: [AN.MET.7] Enteric methane emission, IPCC Model: [AN.MET.5]

The dry matter (“dm”) unit is kg per animal. Crude protein (“CP”), ADF, NDF, lignin, ash, phosphorus, potassium, and nitrogen (“N”) are all percentages of dry matter.

Parameters

methane_model: str

Methane model used for methane emission calculations, including Mills, IPCC.

metabolizable_energy_intake: float

Metabolizable energy intake, Mcal/kg dry matter.

nutrient_amounts: Dict[str, float]

Amounts of nutrients in pen ration, calculated per animal, see Notes section for units.

Returns

float

The daily enteric emissions for dry cows (g/day).

References

(Mills et al., 2003; IPCC, 2006)