The large-scale and medium-sized pig farms have large investment, and the main problems are:

First, blindly adopt the design drawings of the field, without analysis to copy the structure type of the field. For example, the county has invested more than 8 million yuan to build a pig farm with 400 basic sows. The pig house is closed type, and there is a water-filled manure urine pit below the leaky floor. The pig house has been built for 5 years and is still unusable. There are two main problems. First, there is water in the urine pit for 24 hours. The humidity in the winter house is too high to meet the reality of cold areas. Second, water is used to flush the excrement regularly. Pits, on the one hand, use too much water, on the other hand, the amount of sewage containing excrement is too large to be handled.

Second, on the basis of assumptions, do not go through the design of a formal design unit and build a pig house on its own initiative. For example, an enterprise has invested heavily in the construction of three garden-style pig farms. The pig houses are semi-open and equipped with sports grounds. The automatic drinking water pipelines are laid out in the open. The excreta and urine are discharged in an open-air pool and the water hyacinth in the pool is used to improve the environment. . The main problem is that the indoor and outdoor temperatures are the same in winter and the automatic drinking water system cannot be used in winter. The frost-free period in the north is short, and the water hyacinth growing season is limited. The open-air urine pool cannot be purified and beautified with water hyacinth. Another example is a company investing more than 4 million yuan to build a closed double-row single-walk pig house, but the facilities still use small rooms to separate the ground from the traditional rearing methods, the pig house is very low utilization, wear new shoes, take the old road . Winter temperature does not go up and the humidity is still very high. It cannot be used after it is built.

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