The calf house not only provides a highly clean and sterile environment for calves, achieving optimal separation between calves to reduce disease occurrence and prevent cross-infection of diseases among calves, but also enables early consumption of concentrated feed, enhancing the calves' physical condition and growth rate. Polyethylene calf islands have excellent resistance to UV rays, acid, and alkali corrosion, and are easy to transport and clean. Therefore, this "dual-climate" system significantly enhances calves' immunity and ability to withstand complex external environments from birth, providing a healthy and comfortable environment conducive to their growth. Small calf islands can be optionally equipped with feed buckets, milk bottles, heat lamps, bucket covers, and hot-dip galvanized fences. The large calf hutch features a sliding rear door design, offering good ventilation in summer and warmth in winter, with optional calf insulated water troughs and automatic calf feeders.