65 / 2025-04-15 13:57:02

Effects of Positive versus Negative Pressure Ventilation Systems on Thermal Environment Uniformity in Yellow-Feathered Broiler Houses In Northwest China

Yellow-feathered broilers,positive pressure ventilation,negative pressure ventilation,thermal environment

3. 智慧牧场与动物福利 > （1）智慧养殖的利惠：提高动物福利与健康、环境、经济效益与劳动力

The optimization of ventilation modes in poultry housing is crucial for thermal environment regulation, particularly in Xinjiang's arid climate with significant diurnal temperature variations. This study conducted comparative thermal environment assessments in two adjacent yellow-feathered broiler houses (positive-pressure vs. negative-pressure ventilation systems) during summer and winter seasons, utilizing identical boiler heating systems but differing ventilation strategies. Continuous environmental monitoring was performed on 67-day-old broilers from the same batch, with systematic adjustments of ventilation protocols. Results demonstrated that the positive-pressure house achieved superior thermal control precision, exhibiting 1.2±0.35°C (summer) and 0.78±0.43°C (winter) lower daily mean temperatures compared to the negative-pressure system (P<0.05). Three-dimensional thermal analysis revealed significantly enhanced environmental uniformity in the positive-pressure house across longitudinal, lateral, and vertical dimensions (P<0.05). And the concentration of carbon dioxide in the positive pressure chamber in winter is lower(P<0.05).. Notably, broilers in the positive-pressure system exhibited accelerated growth from 28 days onward, achieving significantly higher body weights than those in the negative-pressure system (P<0.05). The findings validate that positive-pressure ventilation effectively improves environmental stability and spatial homogeneity under Xinjiang's extreme climate conditions, providing critical technical support for precision environmental management in arid poultry farming regions.