{
  "type": "pig_nutrient_requirements",
  "data": {
    "杜长大 (DLY)": {
      "保育期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 1.2,
          "max_requirement": 1.5
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.72,
          "max_requirement": 1.05
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.78,
          "max_requirement": 1.08
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.22,
          "max_requirement": 0.30
        },
        "粗蛋白 (%)": {
          "min_requirement": 18.0,
          "max_requirement": 22.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.9,
          "max_requirement": 1.2
        },
        "总磷 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.45
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3226.5,
          "max_requirement": 3585.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥前期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.94,
          "max_requirement": 1.10
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.55,
          "max_requirement": 0.73
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.58,
          "max_requirement": 0.77
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.16,
          "max_requirement": 0.22
        },
        "粗蛋白 (%)": {
          "min_requirement": 16.0,
          "max_requirement": 18.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.7,
          "max_requirement": 0.9
        },
        "总磷 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.40
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3107.0,
          "max_requirement": 3346.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥后期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.81,
          "max_requirement": 0.90
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.58
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.48,
          "max_requirement": 0.61
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.13,
          "max_requirement": 0.18
        },
        "粗蛋白 (%)": {
          "min_requirement": 14.0,
          "max_requirement": 16.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "总磷 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.6
        },
        "有效磷 (%)": {
          "min_requirement": 0.18,
          "max_requirement": 0.35
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2987.5,
          "max_requirement": 3226.5
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "二次育肥期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.53,
          "max_requirement": 0.65
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.30,
          "max_requirement": 0.41
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.31,
          "max_requirement": 0.43
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.10,
          "max_requirement": 0.13
        },
        "粗蛋白 (%)": {
          "min_requirement": 12.0,
          "max_requirement": 14.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "总磷 (%)": {
          "min_requirement": 0.4,
          "max_requirement": 0.55
        },
        "有效磷 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.30
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2868.0,
          "max_requirement": 3107.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      }
    },
    "杜大长 (DYL)": {
      "保育期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 1.2,
          "max_requirement": 1.5
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.72,
          "max_requirement": 1.05
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.78,
          "max_requirement": 1.08
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.22,
          "max_requirement": 0.30
        },
        "粗蛋白 (%)": {
          "min_requirement": 18.0,
          "max_requirement": 22.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.9,
          "max_requirement": 1.2
        },
        "总磷 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.45
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3226.5,
          "max_requirement": 3585.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥前期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.94,
          "max_requirement": 1.10
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.55,
          "max_requirement": 0.73
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.58,
          "max_requirement": 0.77
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.16,
          "max_requirement": 0.22
        },
        "粗蛋白 (%)": {
          "min_requirement": 16.0,
          "max_requirement": 18.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.7,
          "max_requirement": 0.9
        },
        "总磷 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.40
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3107.0,
          "max_requirement": 3346.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥后期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.81,
          "max_requirement": 0.90
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.58
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.48,
          "max_requirement": 0.61
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.13,
          "max_requirement": 0.18
        },
        "粗蛋白 (%)": {
          "min_requirement": 14.0,
          "max_requirement": 16.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "总磷 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.6
        },
        "有效磷 (%)": {
          "min_requirement": 0.18,
          "max_requirement": 0.35
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2987.5,
          "max_requirement": 3226.5
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "二次育肥期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.53,
          "max_requirement": 0.65
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.30,
          "max_requirement": 0.41
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.31,
          "max_requirement": 0.43
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.10,
          "max_requirement": 0.13
        },
        "粗蛋白 (%)": {
          "min_requirement": 12.0,
          "max_requirement": 14.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "总磷 (%)": {
          "min_requirement": 0.4,
          "max_requirement": 0.55
        },
        "有效磷 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.30
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2868.0,
          "max_requirement": 3107.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      }
    },
    "皮长大 (PLY)": {
      "保育期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 1.2,
          "max_requirement": 1.5
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.72,
          "max_requirement": 1.05
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.78,
          "max_requirement": 1.08
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.22,
          "max_requirement": 0.30
        },
        "粗蛋白 (%)": {
          "min_requirement": 18.0,
          "max_requirement": 22.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.9,
          "max_requirement": 1.2
        },
        "总磷 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.45
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3226.5,
          "max_requirement": 3585.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥前期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.94,
          "max_requirement": 1.10
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.55,
          "max_requirement": 0.73
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.58,
          "max_requirement": 0.77
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.16,
          "max_requirement": 0.22
        },
        "粗蛋白 (%)": {
          "min_requirement": 16.0,
          "max_requirement": 18.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.7,
          "max_requirement": 0.9
        },
        "总磷 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "有效磷 (%)": {
          "min_requirement": 0.2,
          "max_requirement": 0.40
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 3107.0,
          "max_requirement": 3346.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "育肥后期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.81,
          "max_requirement": 0.90
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.58
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.48,
          "max_requirement": 0.61
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.13,
          "max_requirement": 0.18
        },
        "粗蛋白 (%)": {
          "min_requirement": 14.0,
          "max_requirement": 16.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.6,
          "max_requirement": 0.8
        },
        "总磷 (%)": {
          "min_requirement": 0.45,
          "max_requirement": 0.6
        },
        "有效磷 (%)": {
          "min_requirement": 0.18,
          "max_requirement": 0.35
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2987.5,
          "max_requirement": 3226.5
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      },
      "二次育肥期": {
        "可消化赖氨酸 (SID %)": {
          "min_requirement": 0.53,
          "max_requirement": 0.65
        },
        "蛋+胱氨酸 (%)": {
          "min_requirement": 0.30,
          "max_requirement": 0.41
        },
        "可消化苏氨酸 (SID %)": {
          "min_requirement": 0.31,
          "max_requirement": 0.43
        },
        "可消化色氨酸 (SID %)": {
          "min_requirement": 0.10,
          "max_requirement": 0.13
        },
        "粗蛋白 (%)": {
          "min_requirement": 12.0,
          "max_requirement": 14.0
        },
        "粗脂肪 (%)": {
          "min_requirement": 3.0,
          "max_requirement": 6.0
        },
        "粗纤维 (%)": {
          "min_requirement": 2.0,
          "max_requirement": 6.0
        },
        "钙 (%)": {
          "min_requirement": 0.5,
          "max_requirement": 0.7
        },
        "总磷 (%)": {
          "min_requirement": 0.4,
          "max_requirement": 0.55
        },
        "有效磷 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.30
        },
        "代谢能 (kcal/kg)": {
          "min_requirement": 2868.0,
          "max_requirement": 3107.0
        },
        "钠 (%)": {
          "min_requirement": 0.15,
          "max_requirement": 0.25
        },
        "氯 (%)": {
          "min_requirement": 0.25,
          "max_requirement": 0.45
        },
        "黄曲霉毒素B1 (μg/kg)": {
          "max_requirement": 10
        },
        "呕吐毒素DON (μg/kg)": {
          "max_requirement": 1
        },
        "玉米赤霉烯酮ZEN (μg/kg)": {
          "max_requirement": 0.15
        }
      }
    }
  },
  "descriptions": {
    "pig_breeds": {
      "杜长大 (DLY)": {
        "description": "杜长大是中国市场占有率最高的商品肉猪。通过利用杜洛克、长白、大约克三品种的杂种优势，实现高效生长和高瘦肉率。",
        "parent_info": "终端父本：杜洛克 (D)；二元母本：长白 (L) × 大约克 (Y)。",
        "appearance_features": "全身白色，体型健壮、体躯较长，肌肉发达，背腰平直。",
        "breed_advantages": "生长速度快、日增重极高、饲料转化率最优、瘦肉率稳定在60%以上、适应性良好、出栏时间最短。",
        "breed_disadvantages": "抗应激能力中等，对疫病和环境变化相对敏感；无法作为种猪进行自繁。"
      },
      "杜大长 (DYL)": {
        "description": "杜大长是另一种重要的外三元猪，与杜长大体系相似，但在母本的搭配上有所区别，同样追求高生长速度和高瘦肉率。",
        "parent_info": "终端父本：杜洛克 (D)；二元母本：大约克 (Y) × 长白 (L)。",
        "appearance_features": "全身白色，体型比杜长大略微魁梧，肌肉丰满度高。",
        "breed_advantages": "生长性能和瘦肉率与杜长大相当，同时遗传了大约克母本的良好体型和生长潜力，综合性能优秀。",
        "breed_disadvantages": "与杜长大相似，无法留作种用，需要依赖稳定的种源体系；对饲养管理要求高。"
      },
      "皮长大 (PLY)": {
        "description": "皮长大是以皮特兰作为终端父本的杂交体系，专注于生产超高瘦肉率的商品肉猪。",
        "parent_info": "终端父本：皮特兰 (P)；二元母本：长白 (L) × 大约克 (Y)。",
        "appearance_features": "多数为白色或带有黑色斑点，肌肉极其发达，后臀饱满，体型呈方形。",
        "breed_advantages": "瘦肉率极高（能达到65%以上），胴体丰满，背膘薄。",
        "breed_disadvantages": "生长速度和日增重逊于杜长大；应激敏感性极高（易发生P.S.S.），管理难度大，肉质易出现PSE（苍白、软、渗水）现象，影响口感和加工性能。"
      }
    },
    "pig_age_stages": {
      "保育期": "从断奶到转入生长舍。主要目标是适应固体饲料，建立肠道菌群，确保健康稳定过渡，体重约5kg~30kg。",
      "育肥前期": "小猪转入育肥舍后到体重达到约60kg的阶段。以骨骼和肌肉生长为主，是高效增重期。",
      "育肥后期": "体重从约60kg到达到出栏体重（约110-120kg）的阶段。脂肪沉积速度开始加快，是出栏前的冲刺期。",
      "二次育肥期": "指收购达到常规出栏体重（约100-120kg）的商品猪，继续饲养至更大体重（140-180kg+）的阶段。其存在主要受市场价格波动驱动，目的是提高单体出肉量。"
    },
    "pig_breed_age_stages": {
      "杜长大 (DLY)": {
        "保育期": {
          "description": "遗传自杜洛克的生长优势在断奶后开始显现，需精细化管理以避免断奶应激和腹泻。",
          "daily_feed_intake": 400.0,
          "daily_gain_weight": 350.0,
          "min_days": 21,
          "max_days": 70,
          "min_weight": 5000.0,
          "max_weight": 30000.0
        },
        "育肥前期": {
          "description": "生长速度和饲料转化率表现良好，是瘦肉沉积效率高的阶段。",
          "daily_feed_intake": 1800.0,
          "daily_gain_weight": 700.0,
          "min_days": 71,
          "max_days": 120,
          "min_weight": 30000.0,
          "max_weight": 60000.0
        },
        "育肥后期": {
          "description": "继续实现较高日增重，脂肪沉积开始加快，管理目标为达到目标出栏体重并保持料肉比。",
          "daily_feed_intake": 2800.0,
          "daily_gain_weight": 800.0,
          "min_days": 121,
          "max_days": 180,
          "min_weight": 60000.0,
          "max_weight": 100000.0
        },
        "二次育肥期": {
          "description": "增重效率下降，料肉比恶化，增重多为脂肪沉积，注意热应激与蹄部问题。",
          "daily_feed_intake": 3500.0,
          "daily_gain_weight": 600.0,
          "min_days": 181,
          "max_days": 240,
          "min_weight": 100000.0,
          "max_weight": 140000.0
        }
      },
      "杜大长 (DYL)": {
        "保育期": {
          "description": "与杜长大相近，生长潜力强，管理重点为断奶适应与稳定采食。",
          "daily_feed_intake": 400.0,
          "daily_gain_weight": 330.0,
          "min_days": 21,
          "max_days": 70,
          "min_weight": 5000.0,
          "max_weight": 30000.0
        },
        "育肥前期": {
          "description": "生长期增重与料肉比接近杜长大，肌肉发展迅速。",
          "daily_feed_intake": 1750.0,
          "daily_gain_weight": 680.0,
          "min_days": 71,
          "max_days": 120,
          "min_weight": 30000.0,
          "max_weight": 60000.0
        },
        "育肥后期": {
          "description": "保持较高增重速度，脂肪沉积稍快于部分 DLY 群体，需配方微调以控制背膘。",
          "daily_feed_intake": 2700.0,
          "daily_gain_weight": 770.0,
          "min_days": 121,
          "max_days": 180,
          "min_weight": 60000.0,
          "max_weight": 100000.0
        },
        "二次育肥期": {
          "description": "与杜长大相似，采食量高但增重多为脂肪，注意健康与福利管理。",
          "daily_feed_intake": 3500.0,
          "daily_gain_weight": 580.0,
          "min_days": 181,
          "max_days": 240,
          "min_weight": 100000.0,
          "max_weight": 140000.0
        }
      },
      "皮长大 (PLY)": {
        "保育期": {
          "description": "个体应激敏感性可能更高，需要稳定环境与逐步换料以减少应激性下降重。",
          "daily_feed_intake": 350.0,
          "daily_gain_weight": 300.0,
          "min_days": 21,
          "max_days": 70,
          "min_weight": 5000.0,
          "max_weight": 30000.0
        },
        "育肥前期": {
          "description": "增重速度一般，但瘦肉率高；需注意高应激个体的管理以避免肉质问题。",
          "daily_feed_intake": 1600.0,
          "daily_gain_weight": 600.0,
          "min_days": 71,
          "max_days": 120,
          "min_weight": 30000.0,
          "max_weight": 60000.0
        },
        "育肥后期": {
          "description": "瘦肉率高且脂肪沉积较慢，但应激易导致肉质问题，育肥管理需谨慎。",
          "daily_feed_intake": 2400.0,
          "daily_gain_weight": 650.0,
          "min_days": 121,
          "max_days": 180,
          "min_weight": 60000.0,
          "max_weight": 100000.0
        },
        "二次育肥期": {
          "description": "超重育肥带来的应激和死亡风险增加，通常不推荐长期二次育肥。",
          "daily_feed_intake": 3200.0,
          "daily_gain_weight": 450.0,
          "min_days": 181,
          "max_days": 240,
          "min_weight": 100000.0,
          "max_weight": 140000.0
        }
      }
    }
  }
}