Environment control status of high temperature in reproductive piggery in Beijing

High temperature is an important environmental factor that influences reproduction of pig. In order to lessen heat stress of reproductive pig, construction types of pig house and cooling methods of reproductive piggery were investigated in 2009, indicators of thermal insulation of common types of wall of piggery were calculated, and inner temperature of the reproductive pig houses was tested. The result indicated that the proportion of enclosed, semi-enclosed and greenhouse pig house was 74.0%, 23.7% and 2.3% respectively. Among present wall materials, the performance of thermal insulation of composite wall with brick covered with polystyrene foam plastic was the best. In test periods, inner temperature of piggery was consistent with outer temperature of piggery approximately, inner temperature of piggery was higher than outer temperature in most time. In the end, advices of high temperature environment control were proposed.