🧬 Lineage Inbreeding Degradation & Hybrid Vigor

"A closed bloodline deteriorates into dust; outcrossing sparks explosive vigor."

In vanilla Minecraft, players can continuously breed a single mother cow with her own children and grandchildren indefinitely without penalty. Natural Reproduction introduces multi-generational Lineage Pedigree Tracking: repeated inbreeding within closed herds causes severe genetic degradation (ultimately resulting in rotten meat and lethal collapse), while introducing wild, unrelated animals unleashes powerful Hybrid Vigor.

---

📋 System Infobox

Property	Value
Feature Name	Multi-Generational Inbreeding Degradation
Master Toggle	natural-reproduction:inbreeding_degradation (Default: true)
Inbreeding Tiers	5 Tiers (T0 Clean, T1 Mild, T2 Moderate, T3 Severe, T4 Lethal)
T3 Meat Penalty	Converts Prime Meat → Rotten Flesh & Bones
T4 Collapse Rate	1.0 Damage / second lethal genetic decay
Hybrid Vigor Bonus	+15% Physical Scale, +20% Max HP, +10% Movement Speed
Primary Helper	AnimalLineageHelper.java

---

🎮 Player & Survival Gameplay Workflow

1. Lineage Pedigree Storage: Every animal born stores its direct mother and father UUID identifiers.
2. Generational Breeding Checks:
   • Mating full siblings, parent-child pairs, or closely related lineages increments the offspring's Inbreeding Tier.
3. Recognizing Genetic Degradation:
   • T1 / T2: Offspring suffer slight health and speed reductions.
   • T3: Severe deformities. When harvested, the animal drops Rotten Flesh and Bones instead of beef/pork/mutton.
   • T4: Lethal genetic collapse. Newborns cannot sustain life and suffer continuous 1 damage/second until death.
4. Outcrossing for Hybrid Vigor:
   • To save an inbred herd, capture a wild animal from a distant biome and breed it with your herd.
   • The resulting outcross resets the inbreeding counter to T0 and grants Hybrid Vigor (+15% scale, golden sparkles, +25% bonus item drops).

---

🧮 Inbreeding Degradation & Stat Matrix

Tier	Lineage Relationship	Genetic Modifiers	Harvest Drop Results
T0	Clean Bloodline / Wild	Normal baseline stats ($1.00\text{x}$ scale)	Normal drops
T1	First Inbred Cross	-10% Max HP, -5% Movement Speed	Normal drops
T2	Sibling-Sibling Cross	-20% Max HP, -10% Speed, Stunted Body	-25% Harvest Yield
T3	Closed Multi-Gen Herd	-35% Max HP, Genetic Defects	Meat converted to Rotten Flesh & Bones
T4	Extreme Closed Loop	Continuous Lethal Decay (1 dmg/sec)	100% Rotten Flesh & Bones Only
HV	Hybrid Vigor (Outcross)	+15% Scale, +20% Max HP, +10% Speed	+25% Bonus Prime Yield

[Mating Pair Evaluation]
           │
           ▼
Are Parents Related (UUID Ancestry Match)?
   ├── Yes ──► [Increment Inbreeding Tier -> T1, T2, T3, or T4]
   └── No  ──► [Outcross Detected! -> Reset to T0 + Grant Hybrid Vigor (+15% Scale)]

---

💻 Developer & Lineage Tracking API

Pedigree Querying

// Check if two animals are closely related
boolean related = AnimalLineageHelper.areCloselyRelated(parentA, parentB);

// Calculate resulting inbreeding tier
int inbreedingTier = AnimalLineageHelper.computeInbreedingTier(parentA, parentB);

CustomData Lineage Structure

{
  "NaturalReproduction": {
    "MotherUUID": "8a31e345-2012-4fa1-8231-54a8cf821102",
    "FatherUUID": "b719c841-8931-419b-b012-9842af910034",
    "InbreedingTier": 0,
    "HybridVigor": true
  }
}

---

🔗 Related Documentation

• Cramped Pen Stunting & Spacious Pasture Recovery
• Physical Scale & Dynamic Harvest Drops
• Gestation & Prenatal Care