Broiler breeds have the characteristics of strong feeding ability, rapid growth and development, strong metabolism, easy deposition of fat, and inconsistent development of various systems. If they are allowed to eat freely during the breeding period, on the one hand, the weight of the chicken will be too fat, too large, and the exercise system and the reproductive system will not be in harmony with the overall development, so that the breeding rate will be reduced, the rate of dead amamuring will increase, and the hens will lay eggs after the breeding. Reduced quantity, increased number of deformed eggs, poor cock fertilization; therefore, in order to prevent chickens from overweight, overweight, consistency of coordinated maturation and maturation, and effective control over the average weight of the flock, restrictions must be imposed (feed restriction). . First, limit feeding 1. Methods The degree of feed restriction is mainly based on the average weight of the flock, health conditions, feed nutrient levels and environmental factors, etc. The feed supply is adjusted weekly to meet the nutritional needs of the flock. There are three main methods: (1) The daily restriction method means that the amount of feed needed for weight gain in the chicken group is averaged to one time per day. This method is suitable for chickens from 4 to 7 weeks of age and 20 weeks of age. Group 2 daily feed restriction method is to feed once every 2 days, and to feed the feed for two days required for weight increase in the chickens this week. This method is suitable for 7-12 weeks old chickens; 3 The “2nd and 5th†restriction methods are to stop the feed within 2 days per week (separate feed days from each other) and feed 5 days. Each feeding day must be fed in one feed. The amount of feed is chickens this week. One-fifth of the total amount of feed needed for weight gain, this method is suitable for 15 to 19 weeks old flocks. 2. Key points Breeding of broiler breeders in the rearing period should mainly focus on two technical indicators, namely, the average weight and evenness of the flock: 1 The average body weight is the main indicator for measuring the increase in chicken population weight. The sampling and weighing of broiler breeders is a tedious, meticulous and very important task for feeding restriction. It is one of the important indexes to measure the effect of feed restriction. Weighing on an empty stomach every weekend, randomly selecting chickens of 5% to 10% of total population, weighing them one by one, calculating the average body weight, and determining the feed amount of chickens for the next week; generally, weekly feeding 3-5g/only appropriate, excessive weight should be less or no material increase, but can not reduce the material; when the weight is lower than the standard to increase the amount of more than appropriate, but should not exceed 10g / only. Any changes in the feeding program should refer to the average weight of the flock, the size of the bones, the degree of obesity, and the degree of feather coverage within 2-3 consecutive weeks. 2 Flock uniformity is an important indicator of the developmental differences among individuals in a flock. It is generally easier to achieve weight management goals in management, but it is not so easy to achieve high uniformity (weight uniformity and sexual maturity uniformity) in rearing breeders. Weight uniformity is measured as the percentage of the total number of samples in the range of "average body weight 15%". More than 80% of the population homogeneity at the end of the breeding period is a qualified chicken population. We should group the whole group before and after weight reduction of the chicken population weight uniformity in about 4 weeks, and then we will weigh and group the whole group before the 8th and 12th weekends, so that the uniformity at 15 weeks will be Achieving a very high level is conducive to subsequent weight control and even sexual maturity. After 15 weeks, the control of body condition and sexual maturation uniformity was mainly achieved through the uniform increase of weekly weight gain. Second, do other management To ensure high-quality diet and drinking water; timely grouping, a small group of 400-500 is appropriate; maintain a suitable density of 8-10 per week for 7-15 weeks, and 3.6-4.8 per month after 16 weeks of age; Adequate intake space, 7-15 weeks of age not less than 10 / slot, maintain good environmental control conditions and litter, light management; regularly do a good job of drug prevention. In short, to achieve the goal of broiler breeder breeding, it is necessary to do a good job in the average weight and evenness of the flock. Correct weighing, accurate calculation, standard feeding, sufficient material level and fast feeding, maintaining good body condition and evenness of the flock, and developing healthy qualified flock for better performance during the laying period Production performance provides a strong guarantee. 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