After 14 days of age, the ventilation volume of broilers gradually increases. Many farmers find it difficult to balance the management of ventilation and thermal insulation, resulting in cold problems and difficult to control.
White feather broilers grow slowly in the early stage and have little demand for ventilation. However, after two weeks of feeding, broilers grow faster and feed intake increases. At this time, ventilation needs to be strengthened to meet the oxygen required for chicken growth.
After two weeks of cooling in the chicken house, the temperature of the chicken house is 28 degrees Celsius. This temperature is a critical value of the temperature of the broiler chicken house. When the temperature of the chicken house is lower than 28 degrees Celsius in the early stage, the chicken is easy to catch a cold. At this time, we need to p ay attention to the cooling of the chicken house. From 28 ℃, the cooling of the chicken house is divided into 3 stages.
The first stage: cooling management of white feather broilers from 14 to 24 days old.
Characteristics of chickens in the first stage:
1. At this stage, the feather development of white feather broilers is not perfect, and their ability to adjust the temperature is not enough.
2. At this time, broilers begin to use fans to strengthen ventilation. At this time, the wind speed brings physical sensation to the chicken, and the temperature begins to drop.
The first stage: cooling management of white feather broilers from 14 to 24 days old.
Characteristics of chickens in the first stage:
1. At this stage, the feather development of white feather broilers is not perfect, and their ability to adjust the temperature is not enough.
2. At this time, broilers begin to use fans to strengthen ventilation. At this time, the wind speed brings physical sensation to the chicken, and the temperature begins to drop.
The second stage: cooling management of white feather broilers from 24 days old to 32 days old.
Characteristics of chickens in the second stage:
1. At this stage, the comfort zone of chickens is about 24 degrees Celsius.
2. It takes about 32 to 35 days for a chicken's feathers to grow completely. The hen's feathers grow completely at 32 days of age, and the cock's feathers grow completely at 35 days of age. At this time, the chicken's feathers are not plump enough. At this time, it still needs the influence of wind speed.
Coop cooling operation:
In 24 ~ 32 days, at this stage, the temperature will be reduced by 2 degrees Celsius, about one degree in 4 days, and the temperature of the chicken house will be reduced from 28 degrees Celsius to 26 degrees Celsius.
Cause analysis:
After 20 days of age, broilers' feed intake increased significantly, their weight increased rapidly, and their demand for oxygen increased. If the ventilation of the chicken is not enough at this time, the chicken will show poor spirit, but there are no abnormal symptoms, that is, the food intake will not increase.
In order to meet the growth needs of broilers, ventilation needs to be increased at this time. At this time, the chicken house is heavily ventilated, the negative pressure of the chicken house increases, and the wind speed accelerates. The wind speed reduces the body temperature of the chicken. The actual temperature felt by the chicken is about 23 ~ 24 degrees Celsius. At this time, it can fully meet the appropriate temperature for the growth needs of the chicken.
The third stage: ventilation management of broilers after 32 days old.
Characteristics of chickens in the third stage:
1. After 32 days of age, the plump feathers and the ability of self temperature regulation began to rise. It has certain resistance to external temperature changes and can enhance ventilation.
2. The suitable temperature for chicken is about 21 ℃.
Coop cooling operation:
The actual temperature of the chicken house, combined with the state of the chicken herd, slowly decreases to 24 degrees Celsius, so don't reduce it any more. At this time, the somatosensory temperature of the chickens in the chicken house decreased by about 3 ℃ under the action of wind speed. It is about 21 degrees Celsius, which can meet the growth needs of chickens. This temperature can be maintained all the time.