Management tips for ventilating broilers in hot and humid conditions
Many areas in the central regions of the world are well known for hot and humid conditions. Temperatures and relative humidity (RH) averaging over 25°C and 80% RH are common for several periods of the year. These hot and humid conditions provide a challenge to achieve top broiler performance.
See the examples below showing a typical yearly average daily temperature/humidity high and low profile in tropical parts of the world.
Closed vs. open production environment
It is well recognized that a closed production environment with a good quality ventilation system and a combination of side and tunnel ventilation, will achieve significantly better broiler performance than a traditional open house system. Lower mortality, higher stocking density, improved FCR, and average daily gain are better when comparing the enclosed environment and open house systems. As a rule of thumb, if implemented properly, a house with a controlled environment can improve overall productivity by up to 20% compared to an open house.
Using chill effect
The use of tunnel ventilation in hot and humid conditions enables a large air volume to remove heat from the birds by producing a chill effect. The reduction in effective temperature felt by the birds using air movement is called the chill effect. The air movement removes heat generated by the birds' bodies as they increase in age. Increasing the volume of airflow creates a lower effective temperature for the bird, and it feels cooler. The key message of this article is "hot, and high humidity conditions are best managed by high airspeed."
A key point in assessing the chill effect is bird age. Younger, less feathered birds will feel a lower effective temperature at the same wind speed than older, better-feathered birds. Explained by older birds have less skin surface compared to younger birds. This fact will reduce the cooling effect of wind speed on older birds. Other factors, such as stocking density and relative humidity, should be considered when assessing the most effective temperature in the house. Observation of the birds in the house is the best method to determine ideal conditions for each age stage.
You find evaporative cooling pads in the tunnel ventilation section of the house. The energy absorbed during evaporation reduces the air temperature in the house. Airflow creates a cooling effect that can reduce the house temperature by 10°C or more. Maximum evaporation is achieved when water pumps are set to provide just enough pad moisture to ensure optimum water evaporation. If too much water is added to the pads, it will most likely lead to higher relative humidity. In some cases, a higher effective temperature in the house.
Below, we have listed management tips to help you mount possible challenges in hot and humid conditions.
Contact your local SKOV Sales Manager to discuss how to improve your broiler productivity by optimizing ventilation in hot and humid conditions.