95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
"""Динамические нормы по уравнениям GfE (Германия)."""
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from __future__ import annotations
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from typing import Any
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USP_DYNAMIC_KEY = "usp"
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NEL_DYNAMIC_KEY = "nel"
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# GfE 2001 Milchkühe — Erhaltung + Milch (Standardmilch / FCM)
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NEL_MAINTENANCE_COEFF = 0.293 # MJ NEL / (kg LM)^0,75 / Tag
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NEL_PER_KG_MILK_MJ = 3.3 # MJ NEL / kg Milch (FCM)
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def gfe_usp_min_g(
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mass_kg: float | None,
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milk_yield_kg: float | None = None,
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) -> float | None:
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"""
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Минимальная суточная потребность в усвояемом протеине (уСП / nXP), г/сут.
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GfE: 0,09 × (масса^0,75) × 6,25 + удой × 85 г.
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"""
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if mass_kg is None or mass_kg <= 0:
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return None
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maintenance = 0.09 * (mass_kg**0.75) * 6.25
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milk = max(float(milk_yield_kg or 0), 0.0) * 85.0
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return maintenance + milk
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def gfe_nel_min_mj(
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mass_kg: float | None,
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milk_yield_kg: float | None = None,
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) -> float | None:
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"""
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Минимальная суточная потребность в ЧЭЛ (NEL), МДж/сут.
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GfE 2001: 0,293 × LM^0,75 + удой × 3,3 (MJ NEL на кг молока).
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"""
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if mass_kg is None or mass_kg <= 0:
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return None
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maintenance = NEL_MAINTENANCE_COEFF * (mass_kg**0.75)
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milk = max(float(milk_yield_kg or 0), 0.0) * NEL_PER_KG_MILK_MJ
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return maintenance + milk
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def preview_dynamic_norms(
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mass_kg: float | None,
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milk_yield_kg: float | None = None,
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) -> dict[str, Any]:
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"""Расчётные min по GfE для UI (без учёта сохранённых норм)."""
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_, dynamic = apply_dynamic_norms(
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{},
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mass_kg=mass_kg,
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milk_yield_kg=milk_yield_kg,
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)
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return dynamic
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def apply_dynamic_norms(
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stored: dict[str, dict[str, float | None]],
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*,
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mass_kg: float | None,
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milk_yield_kg: float | None,
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ration_type: str | None = None,
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force_dynamic: bool = False,
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) -> tuple[dict[str, dict[str, float | None]], dict[str, Any]]:
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"""
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Заполняет нормы по GfE, если в БД min не задан.
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force_dynamic=True — пересчитать min уСП/ЧЭЛ по массе и удою даже при нормах в БД
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(автоготовка с явными mass_kg / milk_yield_kg).
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Возвращает (resolved_norms, dynamic_meta).
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"""
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del ration_type
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resolved: dict[str, dict[str, float | None]] = {
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key: {"min": bounds.get("min"), "max": bounds.get("max")}
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for key, bounds in stored.items()
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}
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dynamic: dict[str, Any] = {}
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for key, compute, formula in (
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(USP_DYNAMIC_KEY, gfe_usp_min_g, "0.09×масса^0.75×6.25 + удой×85"),
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(NEL_DYNAMIC_KEY, gfe_nel_min_mj, "0.293×масса^0.75 + удой×3.3"),
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):
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bounds = resolved.get(key, {"min": None, "max": None})
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if force_dynamic or bounds.get("min") is None:
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computed = compute(mass_kg, milk_yield_kg)
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if computed is not None:
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entry = dict(bounds)
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entry["min"] = computed
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resolved[key] = entry
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dynamic[key] = {"min": computed, "formula": formula}
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return resolved, dynamic
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