Hot as the sun, often making us hot and encourages us to take shelter at the same time consume more water. When the hot weather we often disturbed concentration. What if there are chickens in cages under stress due to the heat?
Masyaly (2004) in a study of Egypt said that it appeared the stress, the heat experienced by chickens not only reduce the appearance of chicken but also lowered immune chicken that can be observed from the number of chickens that died from heat stress because of this.
This study used 180 laying hens that are at the peak of production, with a 31 week old chickens. Where the chicken is placed in fifteen cages with each cage containing four chickens, with each cage will receive one of three treatments.
Three treatment is control (average temperature and relative humidity), cycle (cycle daily temperature and humidity), and Heat Stress (constant humidity and heat) for five weeks. Parameters observed were differences in production and immune chickens.
The control group was treated with the setting temperatures of 23.9 ° C, humidity of 50 percent with a heat index of 25 ° C, which represents the average heat index at different seasons.
The group treated cycle by providing temperature and humidity changes every day, with temperatures between 23.9 ° C to 35 ° C, and the humidity between 50% to 15%, which represents a natural cycle in the summer.
And a third group was exposed to heat stress temperature of 35 ° C, with a humidity of 50 percent, the heat index 41.1 ° C, which represents the heat stress conditions.
production
The results of this study indicate that all production is influenced by heat stress, with an average weight for a five-week study period 1.528 g, 1.414 g and 1.233 g of each of the group konntrol, cycle and heat stress.
According Masyaly weight loss and other appearance of the chicken is in the heat stress in this study was caused by reduced feed intake by chickens.
In this study, reduction in feed intake is proportional to the height and length of exposure to heat stress, the chicken was in the heat stress group experienced a decline in feed consumption significantly when compared to the cycle, and also more significant when compared with the control group.
Decrease in feed intake is in response to heat stress. And further more than just losing weight and feed consumption is an increase in the number of deaths.
Death of the heat stress of 31.7 percent, which is higher than the control group and the cycle respectively 6.7 and 5 percent. According Masyaly increased mortality leads to immune response barrier.
Meanwhile, daily egg production also decreased when compared with the cycle and control. This decrease is due to a decrease in feed intake, as well as the reduction of nutrients used to produce eggs.
Besides heat stress also reduces the digestibility of chicken to feed component, further exposure to the high temperatures will reduce the concentration of plasma protein and plasma calcium when both are needed to form an egg.
This research also revealed that exposure to high temperatures chickens had significant yield decline in egg quality, the egg weight, shell weight and shell thickness.
Egg weight room is on a lower heat stress when compared with a cyclical and cyclically lower when compared with controls, these results lead to the low feed intake.
And the thinner the shell thickness when compared with the cycle and control, the low thickness of the shell is caused by low plasma calcium. Finally chickens located in cages with heat stress generally have Huge Unite (HU) greater when compared to cycle and control.
endurance Body
The results of this study showed no proliferation of B cells and T cells are significantly affected heat stress, it is due to a barrier synthesis of T and B lymphocytes, and the pressure on the activity of white blood phagositosis.
Furthermore spotted a group of white blood cells from heat stress, after a four-week immersion exposure, lower when compared to the control group and significantly lower when compared with the cycle. These results indicate that heat stress can reduce the number and activity of white blood cells.
Finally humoral imunity from chickens that exist in the heat stress group apparently depressed, when compared with the control group as well as cycles. The study found that chickens are in heat stress group one to four weeks after exposure to heat, have a lower antibody titers when compared with the control group as well as cycles.
The decrease is caused by the swelling cytokin in the event of stress, that influence stimulation of the hypothalamus to produce corticotropin releasing factor (CRF).
CRF is working to increase the adrenocorticotropic hormone, which stimulates the production of hormones from the adrenal gland corticosteron. Corticosteron and will inhibit the production of antibodies.
And furthermore it is known that heat stress will reduce labor apparently T-helper 2 cytokin, which is essential for the production of antibodies.
Masyaly (2004) in a study of Egypt said that it appeared the stress, the heat experienced by chickens not only reduce the appearance of chicken but also lowered immune chicken that can be observed from the number of chickens that died from heat stress because of this.
This study used 180 laying hens that are at the peak of production, with a 31 week old chickens. Where the chicken is placed in fifteen cages with each cage containing four chickens, with each cage will receive one of three treatments.
Three treatment is control (average temperature and relative humidity), cycle (cycle daily temperature and humidity), and Heat Stress (constant humidity and heat) for five weeks. Parameters observed were differences in production and immune chickens.
The control group was treated with the setting temperatures of 23.9 ° C, humidity of 50 percent with a heat index of 25 ° C, which represents the average heat index at different seasons.
The group treated cycle by providing temperature and humidity changes every day, with temperatures between 23.9 ° C to 35 ° C, and the humidity between 50% to 15%, which represents a natural cycle in the summer.
And a third group was exposed to heat stress temperature of 35 ° C, with a humidity of 50 percent, the heat index 41.1 ° C, which represents the heat stress conditions.
production
The results of this study indicate that all production is influenced by heat stress, with an average weight for a five-week study period 1.528 g, 1.414 g and 1.233 g of each of the group konntrol, cycle and heat stress.
According Masyaly weight loss and other appearance of the chicken is in the heat stress in this study was caused by reduced feed intake by chickens.
In this study, reduction in feed intake is proportional to the height and length of exposure to heat stress, the chicken was in the heat stress group experienced a decline in feed consumption significantly when compared to the cycle, and also more significant when compared with the control group.
Decrease in feed intake is in response to heat stress. And further more than just losing weight and feed consumption is an increase in the number of deaths.
Death of the heat stress of 31.7 percent, which is higher than the control group and the cycle respectively 6.7 and 5 percent. According Masyaly increased mortality leads to immune response barrier.
Meanwhile, daily egg production also decreased when compared with the cycle and control. This decrease is due to a decrease in feed intake, as well as the reduction of nutrients used to produce eggs.
Besides heat stress also reduces the digestibility of chicken to feed component, further exposure to the high temperatures will reduce the concentration of plasma protein and plasma calcium when both are needed to form an egg.
This research also revealed that exposure to high temperatures chickens had significant yield decline in egg quality, the egg weight, shell weight and shell thickness.
Egg weight room is on a lower heat stress when compared with a cyclical and cyclically lower when compared with controls, these results lead to the low feed intake.
And the thinner the shell thickness when compared with the cycle and control, the low thickness of the shell is caused by low plasma calcium. Finally chickens located in cages with heat stress generally have Huge Unite (HU) greater when compared to cycle and control.
endurance Body
The results of this study showed no proliferation of B cells and T cells are significantly affected heat stress, it is due to a barrier synthesis of T and B lymphocytes, and the pressure on the activity of white blood phagositosis.
Furthermore spotted a group of white blood cells from heat stress, after a four-week immersion exposure, lower when compared to the control group and significantly lower when compared with the cycle. These results indicate that heat stress can reduce the number and activity of white blood cells.
Finally humoral imunity from chickens that exist in the heat stress group apparently depressed, when compared with the control group as well as cycles. The study found that chickens are in heat stress group one to four weeks after exposure to heat, have a lower antibody titers when compared with the control group as well as cycles.
The decrease is caused by the swelling cytokin in the event of stress, that influence stimulation of the hypothalamus to produce corticotropin releasing factor (CRF).
CRF is working to increase the adrenocorticotropic hormone, which stimulates the production of hormones from the adrenal gland corticosteron. Corticosteron and will inhibit the production of antibodies.
And furthermore it is known that heat stress will reduce labor apparently T-helper 2 cytokin, which is essential for the production of antibodies.
