Commonly used three kinds of restriction methods Limiting rearing of broiler breeder chickens during the rearing period can prevent excessive fat deposition in the chickens and keep them at optimal weight. Restricted feeding of broiler breeders is generally started from 4 weeks of age. There are three types of restriction methods: daily feed restriction, every other day of restricted feed, and weekly limit feed. Restricted daily feeding method: feed a certain amount of feed per day, or specify the number of feedings and the time of feeding. This method has less stress on chickens and is suitable for 2-3 weeks before the young chicks are transferred to the rearing period (ie, 3-6 weeks old) and 3-4 weeks before the broiler chicks are transferred to the laying sheds (20-24 weeks). Age, but also for high-speed feeding machinery. Next day feed restriction: Feed the two days together, feed one day, and stop feeding one day. This method has a relatively high feed-restricting intensity and is suitable for the stage where the growth rate is fast and the weight is difficult to control, such as 7-11 weeks old. In addition, this method can also be used for chickens that are overweight, especially cocks. However, it should be noted that the total amount of feed for two days must not exceed the peak load. At the same time, drinking water should be restricted on the day of stopping feeding to prevent the birds from drinking too much water under fasting conditions. Weekly diet: Feed 5 days a week, stop for 2 days, and do not feed on Sundays and Wednesdays. This method limits the strength of feeding is small, generally used for 12-19 weeks of age. Good control of the breeding environment Current restrictions on broiler breeder chickens typically use quantitative feed restriction, which limits the protein and energy intake of chickens by controlling the amount of feed. In this case, because the chicken's feed intake is under control, about half of the chickens are interested in drinking water. The large amount of drinking water and the water brought out by the neck feathers can easily cause dampness in the bedding. Feces are fermented under high-humidity conditions to produce harmful gases such as ammonia gas and hydrogen sulfide. If the ventilation is poor, the accumulation of these harmful gases will cause deterioration of the environment. In this environment, the flock has been destroyed, its resistance to diseases has been reduced, and its infectiousness against infectious diseases such as Newcastle disease and mycoplasma has increased. Wet hot material is also a breeding ground for parasite eggs. Therefore, we should do a good job of environmental control. The first is to limit the flock to water, in addition to the high temperature season, feed on the feeding day 1 hour before feeding, to stop the water 1 hour after eating, do not feed on the water three times a day, each time 1 hour. The second is to pay attention to ventilation, diligent replacement litter, do not allow excessive accumulation of feces and fermentation. The third is to strengthen management, maintain the health of the flock, avoid diarrhea, can add some antibacterial health care drugs in the feed. Avoiding nutritional deficiencies For the breeding chickens in the restricted-feeding stage, if the vitamins, minerals, and other essential components of chicken growth and development are still fed at regular concentrations, insufficient intake will inevitably lead to reduction of the intake of essential substances. Cause a series of nutritional deficiencies. Common nutrient spasms, neurological symptoms, spasms, poor growth, etc., are more pronounced when the chicken is stressed. In view of this situation, the following points must be taken into account when formulating feeds for rearing breeder chickens: Use of quality additives. Increase the amount of additives, such as vitamins can increase by 30% on a normal basis. Feed is now ready for use. When in stress, the amount of vitamins and minerals doubles. Improve drug use The range of use of general drugs is based on factors such as the normal feed intake of chickens. If dietary supplements are added to feeds at the normal drug use concentration during the feed restriction period, the intake of drugs will be reduced due to reduced feed intake. The therapeutic and preventive effects of drugs cannot be exerted, causing certain diseases to occur. Breeding chickens in the rearing period are largely related to the multiple and difficult to control coccidiosis after restricted feeding. Therefore, when using feed-mixed drugs, the use should be increased by 30% on a regular basis, or the provisional feeding should be temporarily changed to free-feeding to ensure that the chicken can consume enough of the drug. Preventing chickens from squeezing and swelling due to snatching In the restricted-feed period, the breeder tends to show a strong sense of hunger after a long period of time, especially if it is not fed. Whenever they are fed again, in the short time from the beginning, the chickens will gather in one place to grab the food sooner. If the chickens are not dispelled in time, the chickens will die, or some of the chickens will eat too much food. Drinking water in a timely manner can easily lead to death. Therefore, when feeding, we must strive for speed, and try to feed when we do not see light. Supply sufficient drinking water before feeding, and water should not be far away from the trough. In this way, the occurrence of bloating can be avoided. 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