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2, poor ventilation. In early brooding, the doors and windows are tightly closed to keep warm. As the density increases, secretions and excretions increase. The use of powdered materials, feathers and dander are shed. The air in the house is extremely dirty and the chicks grow. In such an environment, tears, sneezing, and suffering from arthritis are in a state of disease that seriously affects the quality of growing chickens.
3. The effective position of the feeding trough and drinking fountain is not enough, resulting in poor chicken uniformity. Due to the severe shortage of effective space for brooding, the number of barrels and drinking fountains in the early days could not be large. With the continuous increase of chicken age, the development of the chicken's physique, the chicken can only be divided into several rounds of feeding and drinking water in the case of no increase in barrels and drinking fountains, and the number and quality of feed intake per bird varies. , resulting in poor uniformity of the flock.
Different epidemic prevention measures, different lighting systems and other factors have also contributed to the lack of peak egg production in whole chicken hens.
4, the same chicken house into different batches of chicken. Individual farms (households), in the same chicken house into different age groups of chickens, due to different feeding and management, different disease prevention and control measures, different lighting systems and other factors, but also caused the entire chicken coops not produce eggs One of the reasons for the peak.
5. Pre-production maturation and sexual maturation are not synchronized. Generally divided into two cases, one is the uniformity less than 80%, the coefficient of variation is more than 10%, the average weight is lower than the standard lower limit, the egg age is relatively early, the egg production rate rises for a long time, manifested as The peak of egg production does not go up, and the peak does not go up continuously. The peak duration is short, the weight of eggs is light, and the death elimination rate is high. The other is that the uniformity is less than 80%, the coefficient of variation is more than 10%, the average weight is higher than the upper limit of the standard, the egg age is late, the consumption of the whole material increases, and the ratio of material to egg is high.
6. Insufficient light intensity or intensity in the egg production stage. Practice has shown that laying hens have 14-15 hours of light per day to meet the peak demand of egg production. Be sure to switch light on time when filling light, otherwise it will disturb the reflection of the formation of light stimulation. The electric light should be installed at a height of 1.8-2 meters from the ground. The distance between the lamp and the lamp is equal. A 40 watt light bulb should only be gradually extended for supplementary lighting. When entering the peak period, the light should be relatively stable and the intensity should be suitable.
7. The arrangement of peak egg production period is irrational. The peak egg laying period is about 25-35 weeks old, and the egg production rate is generally more than 85%. During this period, the laying hen's physiological function is the most vigorous and must be used effectively. During this precious period, if brooding in early spring, the peak period of laying eggs in the flock is in the summer. Because of the hot weather, the chickens eat less, most of the chicken farms have ineffective measures to prevent heatstroke, or although there are certain measures, it is very difficult. The optimum temperature (18-24 degrees Celsius) is reached during the egg production period. Moreover, due to the hot weather, the house needs to use artificial cooling or cooling with a fog machine to increase the humidity inside the house. E. coli is suitable for growth and reproduction. The chicken is susceptible to E. coli disease, which can also make it difficult for laying hens to reach peak height. .
Analyze the reasons for the production loss of laying hens
1, the feeding density is too high. The main forms of laying hens in China are small-scale and large-scale groups. Due to restrictions on funds, venues, equipment and other factors, or the intensive pursuit of rearing scale by breeders, the density of brooding and rearing of the breeding households is generally high. The brood density in the first week is generally 30 per square meter, and it is actually twice as high. It is more common, even 2-3 times higher. Some households from the chicken into the cage on the cage the same density, early can not be evacuated on time, 6-week-old body size, body weight is difficult to achieve the standard, a direct impact on brooding, bred chicken quality. In years of laying hens' production practice, it has been profoundly realized that the stocking density is the primary factor that limits the production performance of laying hens.