It is one of the important methods to manage the growth and development of chickens by weighing and obtaining the average weight and evenness (coefficient of variation) information of the birds in each column and accurately estimating the information. Quality management is one of the most important and basic management tasks in the production of broiler breeders. From the first day to the elimination of the flock, we must pay attention to the body mass every day, regardless of the breeding period or the laying period. The correct quality information is crucial to the production performance of the flock.
Weighing purpose
Monitoring the growth and development status and evenness of chickens, assessing the condition of chicken populations, providing important information for chicken breeders to adjust feeding and management, so that the chickens grow according to the set goals and achieve optimal production. performance.
Weighing principle
The birds were weighed at least once a week using a standardized, accurate, and repeatable weighing procedure. Through the feeding amount and feed distribution management, the target body weight and uniformity of each week of the flock are controlled.
Weighing requirements
The same standard as the day of feeding or feeding, weighing, interval days, scales, etc.; the same calculation method as the coefficient of variation, uniformity, body weight recording method; the same weighing system and calibration method; the same day of the week Same time, same place, same person, same sampling method, same weighing procedure. In order to make the sample as representative as possible and to increase the accuracy of body mass estimation, if the breeding period is more than 1000 chickens per individual, this column or the house should be sampled and weighed at two different locations; The flock should be sampled and weighed at three different locations; sampling and weighing should be done in the middle of each bar or house, not at the door or on the side of the barn or fence; use a catcher bar, for example. All chickens enclosed in the pen must be weighed to eliminate the influence of human factors.
Weighing method
A representative chicken was sampled and weighed. The growth and development of the flock was assessed by comparing the actual body mass and the corresponding body weight of the standard age. There are two main types of weighing systems, manual scales and electronic scales. In order to make the repeat weighing of each flock reliable, the same weighing system should be used for each weighing. Regardless of the type of weighing system used, employees must be gentle when catching chickens, and need to consider the welfare of poultry and be properly trained.
Manual weighing system. There are many different types of artificial weighing systems, such as the use of hanging scales for manual weighing, when the weighing scale is about 20 grams, the maximum weighing capacity is 5 kilograms; traditional scales such as mechanical or hands need to manually record data , and data processing requires manual calculations.
Electronic weighing system. The electronic scale can record the weight of each chicken in the smallest scale, and can automatically calculate and print the statistical data of the flocks, such as the total number of weighed birds, the average weight of the flock, the variance and range, and the coefficient of variation.
Weighing time
Eggs are weighed at least once a week starting from 1 day of age and throughout the egg production period. The chicks should be weighed weekly after entering the house. One-day-old, seven-day-old and 14-day-old can be grouped and weighed; individuals should be weighed after 14 days of age. At least 3 boxes of chicks are to be weighed in each column when entering the house; to accurately calculate the average weight of the chicks, the number of live chicks per box and the weight of the chick box must be known; a box of chicks per pen is taken when the chicks enter the house. Individual weighing is performed to assess the chicks' quality, which helps to establish early management procedures for the chicks. After 7 days, at least 2% of the chickens or no less than 50 chickens should be weighed for each column. Weighing determines the average body weight of the flock; comparing the average to the standard body mass to formulate the feeding plan. If calculating the evenness (coefficient of variation) of the flock, individual flock must be weighed; if the conditions permit the individual body mass of the flocks to be recorded as early as possible, generally 20,000 - 30000. The weighing time in normal circumstances, the breeding period is the same day or week before the feed is fed on the same day of the week, or 4 hours to 6 hours after the feed is collected.
Weighing steps
Manual weighing. When using artificial scales to weigh the flock, the weight of each chicken should be recorded on the weighing scale. After the birds were weighed, the average body weight, body mass range (maximum body mass minus minimum body mass) and coefficient of variation were calculated. The average body mass and coefficient of variation should be plotted as a mass-mass curve, and compared with the standard body mass, and the difference between the body mass and the target body mass can help determine the amount of future feeding.
Electronic weighing. If using the electronic weighing method, the statistics of the flock (average body mass, body mass range and coefficient of variation) are automatically calculated and statistical results are generated automatically. As with manual weighing, the average body mass and coefficient of variation of the flock should be compared between the adult mass curve table and the standard body mass. Differences from the standard will help determine the future feeding level of the flock.
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