The scale of broiler chicken breeding continues to expand, and the equipment is becoming more and more advanced, but many farm managers still have entanglements: chickens using cooling pads are prone to catching colds, while chickens without cooling pads are prone to heat stress, mouth breathing, reduced feed intake, slow growth, and even heat stress. Leading to large-scale deaths of broiler chickens; Nantong Yueneng analyzed the use of cooling pads to help everyone survive the hot season.
一. Prepare the cooling pad exhaust fan
A 50-inch exhaust fan is generally equipped with a cooling pad of 6 square meters. The cooling pad area is more than enough. However, when purchasing a cooling pad, the equipment manufacturer calculates it based on the outer frame, but in actual use, the effective ventilation area is used. The ventilation area can often only reach 70-90% of the design area; at the same time, after 1-3 years of use, the ventilation efficiency of the cooling pad is estimated to be reduced by 10-30%. In some cases, poor management may cause scale adhesion and willow catkin dust. The lint is clogged, the cooling pad paper bubbles rot, and the ventilation efficiency of the cooling pad can be reduced by more than 40%.
When large-scale chicken houses are longitudinally ventilated in summer, the negative pressure often exceeds 20Pa, and the ventilation efficiency of the fans is often reduced by more than 20%. The ventilation effect of poor-quality fans is even more terrible; if the chicken houses are equipped with poor-quality fans, cooling pads must be used before use. When combined with the wind blocking factor of the cooling pad water film, the ventilation efficiency will be even worse. The cross-sectional wind speed in the chicken house will not meet the design standards, and the cooling effect of the cooling pad will be impossible to discuss.
二.Master cooling pad data
The use of cooling pads relies on the evaporation effect of water, so the cooling pads wet and dry cycle mode is generally required. At the same time, considering the power of the cooling pad water pump and the thickness and length of the water distribution pipe, these will affect the length of time the cooling pad cloth is wetted with water. Generally, the farm manager is required to clarify the following cooling pad data before using the cooling pad.
Cooling pad data table
| Wetted area | Working hours of cooling pad pump | Cooling pad drying time |
| 20-30% | 8-12s | 5-8min |
| 50% | 15-20s | 5-8min |
| 60-70% | 20-30s | 6-10min |
| 100% | 30-60s | 8-15min |
三. Understand the outside weather
The outside weather is an important reference data for the application of cooling pads. Generally, the application of cooling pads should be considered when the outdoor temperature is above 28°C. At the same time, the relative humidity must also be taken into consideration. When it is lower than 40%, in most areas of the country, only the air cooling effect can meet the needs of chickens. The demand for group fattening; when it is higher than 80%, the heat and humidity stress will be more obvious. At this time, it is generally recommended to add a small amount of water to the cooling pad to dry and wet the mode, or longitudinal ventilation to assist in adding anti-heat stress vitamins to survive the hot and humid weather.
四.Clarify the needs of the chickens
Broilers generally start to consider using cooling pads when they are 25 days old; considering that the outside temperature and humidity of the chicken house are different, the cooling effect of cooling pad application is different, and the needs of the chickens are different. At the same time, it is also necessary to clarify the cooling effect of the house under different cooling pad moistening ratios. Environmental fluctuations in internal temperature and humidity and chicken performance.
