Indoor lambing systems provide shelter and enable intensive supervision but create welfare challenges around stocking density, bedding quality, disease pressure, and respiratory health.
Overcrowded indoor lambing systems create conditions for rapid disease transmission including enzootic pneumonia, orf, and neonatal enteric disease. Inadequate bedding depth causes ewes to give birth on cold hard floors, contributing to lamb hypothermia and injury. Poor ventilation causes respiratory disease in lambs and ewes — ammonia levels above 25 ppm impair respiratory health significantly. Ewes in high-density pens have limited ability to establish mother-lamb bonds away from interference by other animals. Good stockmanship and pen design can mitigate most of these risks.