थे management of humidity in the hatcher ~ Slamet Yonata

Kamis, 03 Februari 2011

थे management of humidity in the hatcher

Kamis, Februari 03, 2011 Unknown

The management of humidity in the hatcher is just as important to the overall chick quality as is the manipulation of temperature and airflow. As you can see from the above photos that running a high humidity set point requires the humidity sprays to run quite frequently throughout the entire hatch cycle, to the point the troughs can begin to fill with water. This situation creates several problems that will have an adverse effect on the chicks and overall chick quality. Every time humidity water is sprayed into cabinet, it disrupts the internal environment of the hatcher. This disruption causes the hatcher to continually run heating /cooling/humidity cycles. If the hatchers are connected to a Galaxy computer, you can see the continual heat/cool cycles in the graphs. When we look at these graphs, you could see that these hatchers had to run heating cycles from transfer to hatch pull. When we look at the standard set points for heating and cooling, these cycles have an impact on the tray temperature that the eggs/chicks are experiencing due to the constant increasing and decreasing temperatures and humid ties around the egg mass. Running at a lower humidity set point will benefit you in several ways. Reducing or eliminating the need for humidity to be sprayed inside the hatcher will allow the internal environment to remain stable throughout the hatching cycle. The only need for heating will only be in the first several hours after transfer. After which the hatcher will be in a continually escalating cooling mode. Lowering the humidity will reduce stress to the chicks once they have hatched by reducing the heat index that the chick is exposed. The heat index is a mathematical formula that combines the ambient temperature and the relative humidity; this is the “apparent temperature”. As the heat index increases, it will slow down the ability of the chick to cool itself because as humidity increases with high ambient temperatures, the rate of evaporation decreases. The chicks will pant to cool it by expelling moisture, in the presence of high humidity conditions, the effectiveness of panting decreases causing the chick to pant harder and results in an increase in the chick’s internal body temperature and dehydration. There are several things that we can look at to see if the chicks are being stressed due to high heat index values. As we all know, stressed chicks are loud chicks. If the chicks are not being stressed, you should be able to walk into the hatcher hall just prior to hatch pull and hear very little noise except for the fans in the hatchers. Upon opening the hatcher doors, the chicks should be bedded down in the trays, and evenly spread across the entire tray, not standing up and actively moving around the trays and along the outer edges of the trays. Having the chicks lying down improves the airflow through the tray and improves the temperature stability. Another method to use in determining the right humidity conditions and to see if the chicks are under stress is to look at the egg residue. If the chicks are not under stress, and hatching in a timely manner, there should be no meconium staining to the eggshells. When chicks are stressed, they will defecate in order to reduce body temperature. In addition, you can take internal body temperatures prior to hatch pull. The chick’s body temperature should be around 36 degrees (96 F) just after hatching, and between 38.9-40.0 degrees (102-104 F) just prior to hatch pull. Data loggers are a good tool to use to measure tray temperatures as well. The goal is to keep tray temperatures at the internal body temperature of the chicks prior to hatch pull. If the tray temperature exceeds the body temperature, then we will begin to see heavy panting of the chicks. As you can see in the above graph, the humidity set point is at 28 degree C (82.4 F). Running a lower humidity set point, we can see the natural increase and decrease in humidity caused by the active hatching and subsequent dry down of the chicks. Being able to see this hatch window is an excellent management tool in determining proper egg set times and incubation durations. The graph above is from a single stage hatchery. The duration of the hatch window in this example was around 20 hrs, and around 8 hour from the end of active hatching to hatch pull. By knowing the length of the hatch window and the time from dry down to hatch pull will allow management to better adjust set times so that chicks do not spend any unnecessary time in the hatchers waiting to be harvested. The duration of the hatch window in multi-stage incubation systems should be between 24-30 hours, with the peak of the hatch window to occur 18 hours prior to hatch pull. Monitoring the hatch windows will also allow the management to see if there are any issues that may need to be addressed with the incubators. Lowering humidity is not the only key to the goal of improving chick quality. We also need to look at the hatcher halls the machines are operating. It is very important that the environment of the halls be maintained at the appropriate levels. If the room humidity is too low, the reduction of the humidity set point will not reduce the amount of humidity that will need to be sprayed. The optimal range for room humidity should be between 45-55% RH and a room temperature of 24-26.6 degrees (75-80 F). The overall goal to increase chick quality and the management of humidity in the hatcher will require looking at the overall process inside not only the hatcher, but also, all of the external inputs and influences on the hatcher. I have seen customers increase their chick quality with humidity set points of 27.8 degree WB. Some have gone as low as 26.7 degree WB, and still others have completely turned off their humidity sprays. Going as far as turning the sprays off completely will place more emphasis on the tight control of the room’s environments. I would recommend that when adjusting humidity set points, start with one or two hatchers, and evaluate the results compared to unaltered hatchers until the desired results are achieved.

Posted in: ब्रोइलेर देअद्ली effect

The management of humidity in the hatcher is just as important to the overall chick quality as is the manipulation of temperature and airflow.

As you can see from the above photos that running a high humidity set point requires the humidity sprays to run quite frequently throughout the entire hatch cycle, to the point the troughs can begin to fill with water. This situation creates several problems that will have an adverse effect on the chicks and overall chick quality. Every time humidity water is sprayed into cabinet, it disrupts the internal environment of the hatcher. This disruption causes the hatcher to continually run heating /cooling/humidity cycles. If the hatchers are connected to a Galaxy computer, you can see the continual heat/cool cycles in the graphs. When we look at these graphs, you could see that these hatchers had to run heating cycles from transfer to hatch pull. When we look at the standard set points for heating and cooling, these cycles have an impact on the tray temperature that the eggs/chicks are experiencing due to the constant increasing and decreasing temperatures and humid ties around the egg mass. Running at a lower humidity set point will benefit you in several ways. Reducing or eliminating the need for humidity to be sprayed inside the hatcher will allow the internal environment to remain stable throughout the hatching cycle. The only need for heating will only be in the first several hours after transfer. After which the hatcher will be in a continually escalating cooling mode. Lowering the humidity will reduce stress to the chicks once they have hatched by reducing the heat index that the chick is exposed. The heat index is a mathematical formula that combines the ambient temperature and the relative humidity; this is the “apparent temperature”. As the heat index increases, it will slow down the ability of the chick to cool itself because as humidity increases with high ambient temperatures, the rate of evaporation decreases. The chicks will pant to cool it by expelling moisture, in the presence of high humidity conditions, the effectiveness of panting decreases causing the chick to pant harder and results in an increase in the chick’s internal body temperature and dehydration. There are several things that we can look at to see if the chicks are being stressed due to high heat index values. As we all know, stressed chicks are loud chicks. If the chicks are not being stressed, you should be able to walk into the hatcher hall just prior to hatch pull and hear very little noise except for the fans in the hatchers. Upon opening the hatcher doors, the chicks should be bedded down in the trays, and evenly spread across the entire tray, not standing up and actively moving around the trays and along the outer edges of the trays. Having the chicks lying down improves the airflow through the tray and improves the temperature stability. Another method to use in determining the right humidity conditions and to see if the chicks are under stress is to look at the egg residue. If the chicks are not under stress, and hatching in a timely manner, there should be no meconium staining to the eggshells. When chicks are stressed, they will defecate in order to reduce body temperature. In addition, you can take internal body temperatures prior to hatch pull. The chick’s body temperature should be around 36 degrees (96 F) just after hatching, and between 38.9-40.0 degrees (102-104 F) just prior to hatch pull. Data loggers are a good tool to use to measure tray temperatures as well. The goal is to keep tray temperatures at the internal body temperature of the chicks prior to hatch pull. If the tray temperature exceeds the body temperature, then we will begin to see heavy panting of the chicks. As you can see in the above graph, the humidity set point is at 28 degree C (82.4 F). Running a lower humidity set point, we can see the natural increase and decrease in humidity caused by the active hatching and subsequent dry down of the chicks. Being able to see this hatch window is an excellent management tool in determining proper egg set times and incubation durations. The graph above is from a single stage hatchery. The duration of the hatch window in this example was around 20 hrs, and around 8 hour from the end of active hatching to hatch pull. By knowing the length of the hatch window and the time from dry down to hatch pull will allow management to better adjust set times so that chicks do not spend any unnecessary time in the hatchers waiting to be harvested. The duration of the hatch window in multi-stage incubation systems should be between 24-30 hours, with the peak of the hatch window to occur 18 hours prior to hatch pull. Monitoring the hatch windows will also allow the management to see if there are any issues that may need to be addressed with the incubators. Lowering humidity is not the only key to the goal of improving chick quality. We also need to look at the hatcher halls the machines are operating. It is very important that the environment of the halls be maintained at the appropriate levels. If the room humidity is too low, the reduction of the humidity set point will not reduce the amount of humidity that will need to be sprayed. The optimal range for room humidity should be between 45-55% RH and a room temperature of 24-26.6 degrees (75-80 F). The overall goal to increase chick quality and the management of humidity in the hatcher will require looking at the overall process inside not only the hatcher, but also, all of the external inputs and influences on the hatcher. I have seen customers increase their chick quality with humidity set points of 27.8 degree WB. Some have gone as low as 26.7 degree WB, and still others have completely turned off their humidity sprays. Going as far as turning the sprays off completely will place more emphasis on the tight control of the room’s environments. I would recommend that when adjusting humidity set points, start with one or two hatchers, and evaluate the results compared to unaltered hatchers until the desired results are achieved.

Slamet Yonata

Kamis, 03 Februari 2011