In summer and autumn, the weather is hot, and often rainfall, high temperature, high humidity, and poor ventilation in the house, leading to changes in the metabolism and physiological function of laying hens, reduced feed intake, increased drinking water, and thus affect the production of layer chickens Egg rate, feed utilization, disease resistance, and even suffocation of laying hens are called heat stress, namely Chicken heat stroke.
It is generally believed that laying hens have the best egg production performance in the temperature range of 10°C to 28°C, but they cannot tolerate sustained high temperatures above 30°C. It has been observed that when the temperature is above 28°C, the laying hens show mouth breathing, shallow breathing and rapid development, hot wheezing and throat flapping, standing, wings hanging down or wings widening to increase the surface heat dissipation area. Due to increased body heat, metabolic function is reduced, the layer of chickens instinctively reduces feed intake, so the layer shows poor appetite, reduced feed intake, which in turn leads to weight loss, eventually causing decreased egg production and egg weight. Thinning.
In addition, due to the sustained effect of high temperature, the reduction of ovulation hormone (luterphin) will affect the timely release of eggs in the ovary. Dietary intake of egg hens is reduced, and body fat is consumed in large amounts, resulting in a proportional decrease in egg yolk and protein weight, resulting in reduced egg weight. Insufficient intake of calcium and phosphorus in the feed, resulting in thin shell eggs, soft shell eggs, increased the rate of broken eggs. At the same time, due to the high temperature, the water consumption of laying hens increases, and the phenomenon that chicken droppings are relatively wet is relatively rare. If the sink is not cleaned in time, drinking water and feed are not hygienic, which often leads to enteritis (diarrhea diarrhea). Under stress conditions, laying hens have low immunity and warm and humid summers. This is a good environment for pathogens to breed. It is more prone to peritonitis and fallopian tubes caused by conditional pathogens such as E. coli, Salmonella and Pasteurella. Inflammation, enteritis, cholera and other diseases. Due to the poor immune effect, the antibody level of laying hens is not high, resulting in the occurrence of infectious diseases such as Newcastle disease, infectious bronchitis, and infectious rhinitis.
Prevention:
First, to ensure the provision of adequate clean drinking water, timely supplement of nutrients, adjust the chicken's internal environmental balance, adjust the intestinal flora balance.
Summer temperatures are high, and layers require more water and must meet their drinking needs. At the same time, in the drinking water, Vitalion Bao-2008, which has a speed-up speed adjustment function, can effectively reduce body heat and calm the chickens. Conditions allow the layer to drink water that is deep in water or ice.
Modern medicine believes that heat stress can lead to abnormalities in the body's endocrine system and cause dysfunction of the digestive system. With the dysbacteriosis of the digestive tract, diarrhea or decreased resistance may occur. In response to this situation, stress summer grams were added to the feed.
In addition, before and after the immunization of laying hens in their drinking water by adding Huang Mao polysaccharides, and even drink 3 to 5 days, can significantly improve the immune effect and antibody levels.
Second, according to plans to invest in health care drugs to ensure the health of the chicken body.
In order to prevent the interference of conditional pathogens, Amoxicillin, Enrofloxacin, Fluretid (20% Florfenicol), Legogine (Lincolomycin, Spectral Medicinal premixes) and other drugs to effectively reduce the incidence of chicken peritonitis, salpingitis, cholera. If the egg production rate declines drastically, add ginseng toxin to the hens' drinking water and stir in the feed to strengthen the ginsenosides to stabilize the egg production rate and allow it to rise.
Japan adds baking soda to the feed (or drinking water) of laying hens, which is ideal for preventing heat stress. Addition method: the amount of drinking water is 0.63% (when the temperature is above 28°C, it is added from 11am to 3pm), and the amount of feed is 0.5% (the effect is higher than that of drinking water) Better.)
Third, to improve the environment, pay attention to ventilation, heat, shade.
The henhouse sports ground should be planted with vines or fruits, and shaded arbors should be erected; the sheds should be ventilated and sprayed with water under a ventilated condition and sprinkled on the roof. Conditions are best to install a wet curtain to cool the house.
Fourth, adjust the feed formulation to improve the nutritional level of feed.
Increase the level of protein, vitamins, and amino acids in the diet, and add 1% to 3% of animal oil to feeds to ensure that the intake of energy substances is sufficient for high energy consumption and insufficient intake. Be careful to add them step-by-step and not overdosage so as not to cause lice in the layer.
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