From the whole stage of laying hens' development, there is a highly positive correlation between body size and whole body skeletal development; 71% of body size and 27% of body weight can be completed within 8 weeks of gestation; at the age of 12 weeks, the length of luminal bone completes the entire development period. More than 90%; after 12 weeks of age growth slowed down; 20 weeks of age cochlear up to the maximum weight of 20 weeks of age reached 75% of the whole period; after the slow development until the 36 to 40 weeks of age basically stopped growing. After 40 weeks of age, weight gain is only fat. Therefore, after 12 weeks of age, the growth rate of skeletal muscle and visceral organs is inconsistent. In order to avoid excessive fat accumulation caused by excess nutrients and fatty liver disease, restrictions on feeding should be taken. However, breeders are now not adopting restrictions on rearing, and breeding companies of each breed have their own standards. For example, whether the brooding period is over, and the standard of body weight and length of cheekbones at the age of 8 weeks is considered as the criterion; Degree and so on. Samples of 5% to 10% of the total group points, within 80% of the total number of individuals in the range of increase or decrease in body weight average value of 10%, are ideal, and the number of individuals within the range of 5% of the average length of humerus increases by more than 95%. For the ideal index, if the length of the sacral bone reaches the standard (such as the diameter of the sacral bone of Decathlon chicken is 71-83 mm), use the bred material immediately. On the contrary, continue to use broodstock, do not look at what age is now. During the growth period, high-energy feed is used, and the weight during the rearing period is emphasized, and it is weighed once a week. It is best to weigh each time. If the average weight is lower than the standard weight at that time, increase the energy and try to make the chicken uniform. When the average body weight reaches 18 weeks of age, whether the bird is 18 weeks old or not, immediately switch to the peak of production and increase the light. The theoretical basis for the above approach is to introduce the concept of size of laying hens. Body types include bones, muscles, and fats. The relationship between visceral development and body maturation and sexual maturation. Body weight is a direct reflection of body shape. A body weight that meets the standard means that body maturity and sexual maturity are almost synchronized to meet the various physiological indicators required for the egg laying period. The brood length focuses on the length of the ossicular cavity, which is essentially the external performance of the bones. If the skeletal development meets the requirements, it can provide a solid foundation for increasing the weight of the ftT in the future. Body mass indexing means mature sexual maturity. On the day of production, if chickens that have already attained the weight have been blindly adopted restrictive feeding methods and control of light, and thus restrictive maturation, the chickens will be opened at 20 weeks of age. This will artificially cause poor laying hens. Excited, but affecting the production performance. The correct approach is to eat freely, through sampling, with the appropriate level of different weight stages of laying hens. Timely light, so that light stimulation and weight at the same time the transition to production. China Agricultural Network Editor
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