The term of laying hens refers to the period from the end of brooding to the start of production, which is generally 7 weeks to 20 weeks. The quality of broiler chickens has a great impact on the production performance of laying hens throughout their lives. The main task of the breeding period is to ensure that the broiler chicken has a high survival rate and a fully developed body, and strictly controls weight and sexual maturation, and develops a qualified chicken group with a uniformity of more than 85% and a high yield potential. Uniformity mainly includes body shape, weight, and sexual maturity. In actual production, the weight uniformity is the most important. Weight uniformity refers to the percentage of birds in the population whose body weight is within 10% of the standard body weight. Uniformity can reflect the quality of broiler chickens and can also reflect the management level of chicks and broilers. Therefore, the degree of evenness directly determines the production performance of late chickens. There are several measures to improve the uniformity of broiler chickens.
Randomly sample and weigh on a regular basis and measure the length of the pod to ensure that it is weighed once a week: Weighing is an effective way to correctly assess the average weight and evenness of a flock population. Groups can be weighed before 3 weeks of age, and each group has about 30 chickens. Individuals can be weighed after 3 weeks of age. The percentage of withdrawal depends on the size of the flock. Generally, it should account for 5% of the total flock of chickens (more than 5,000 chickens can be selected from 2% to 3%, 1000 to 5000 Chickens can be collected in 5%), and should not be less than 100, and small groups should not be less than 50. The test chickens were weighed and recorded separately.
Weighing time: on the same day of the week to ensure accurate weighing. Only in this way can we truly understand the growth and development of the flock.
The weighted results were compared with the standard weight of the week, and then the feeding amount was adjusted next month so that the birds were always in a proper weight range.
In the process of weight management, from 4 weeks of age, the skeleton development was measured once every 2 weeks to observe whether it was consistent with the development of body weight. Generally, the length of the sacrum (that is, the part from the paw to the ankle joint) is measured. At least 90% of the length of the scapula should be a standard length, and the length should not exceed 5% of the standard value.
Timely and reasonable transfer group to determine the size of the chicken group based on the test results, physical strength, timely and reasonable adjustment of the flock, group management, according to the development of small groups to regulate the level of feeding. The chickens with discriminating mistakes, poor development and obvious illnesses should be eliminated in time, the dead chickens should be dealt with promptly, and the caged laying hens should be replenished in a timely manner to ensure that the number of chickens per cage is consistent. The chickens with weaker constitution and smaller individuals were intensively reared and the time for reloading was postponed so that they could reach the standard as soon as possible, thereby improving the overall evenness.
Adjusting Feeding Density Feeding density is a very important aspect of determining flock uniformity. When the stocking density is too high, the flock is limited in activity, the chickens are chaotic, the competition is fierce, and the food intake and drinking water are uneven, the growth is slow, and it is easy to make some chickens lose weight and affect the evenness of the flock; if the density is too small, the raising cost is increase. According to the chicken house and equipment configuration, the breeding density is recommended as follows: Ground leveling, 7 weeks to 14 weeks of age, 10 to 12 per square meter, 15 weeks to 20 weeks of age, 6 per square meter 8 to 8; on-line flat raising, 7 to 14 weeks of age, 12 to 14 per square meter, 15 weeks to 20 weeks of age, 8 to 10 per square meter; three-dimensional cages, 7 weeks of age~ At 14 weeks of age, 20 to 24 per square meter, 15 weeks to 20 weeks of age, 12 to 16 per square meter.
Randomly sample and weigh on a regular basis and measure the length of the pod to ensure that it is weighed once a week: Weighing is an effective way to correctly assess the average weight and evenness of a flock population. Groups can be weighed before 3 weeks of age, and each group has about 30 chickens. Individuals can be weighed after 3 weeks of age. The percentage of withdrawal depends on the size of the flock. Generally, it should account for 5% of the total flock of chickens (more than 5,000 chickens can be selected from 2% to 3%, 1000 to 5000 Chickens can be collected in 5%), and should not be less than 100, and small groups should not be less than 50. The test chickens were weighed and recorded separately.
Weighing time: on the same day of the week to ensure accurate weighing. Only in this way can we truly understand the growth and development of the flock.
The weighted results were compared with the standard weight of the week, and then the feeding amount was adjusted next month so that the birds were always in a proper weight range.
In the process of weight management, from 4 weeks of age, the skeleton development was measured once every 2 weeks to observe whether it was consistent with the development of body weight. Generally, the length of the sacrum (that is, the part from the paw to the ankle joint) is measured. At least 90% of the length of the scapula should be a standard length, and the length should not exceed 5% of the standard value.
Timely and reasonable transfer group to determine the size of the chicken group based on the test results, physical strength, timely and reasonable adjustment of the flock, group management, according to the development of small groups to regulate the level of feeding. The chickens with discriminating mistakes, poor development and obvious illnesses should be eliminated in time, the dead chickens should be dealt with promptly, and the caged laying hens should be replenished in a timely manner to ensure that the number of chickens per cage is consistent. The chickens with weaker constitution and smaller individuals were intensively reared and the time for reloading was postponed so that they could reach the standard as soon as possible, thereby improving the overall evenness.
Adjusting Feeding Density Feeding density is a very important aspect of determining flock uniformity. When the stocking density is too high, the flock is limited in activity, the chickens are chaotic, the competition is fierce, and the food intake and drinking water are uneven, the growth is slow, and it is easy to make some chickens lose weight and affect the evenness of the flock; if the density is too small, the raising cost is increase. According to the chicken house and equipment configuration, the breeding density is recommended as follows: Ground leveling, 7 weeks to 14 weeks of age, 10 to 12 per square meter, 15 weeks to 20 weeks of age, 6 per square meter 8 to 8; on-line flat raising, 7 to 14 weeks of age, 12 to 14 per square meter, 15 weeks to 20 weeks of age, 8 to 10 per square meter; three-dimensional cages, 7 weeks of age~ At 14 weeks of age, 20 to 24 per square meter, 15 weeks to 20 weeks of age, 12 to 16 per square meter.
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