After the breeder enters the due date, in order to meet the needs of the rapid development of the flock, the feeding restriction gradually decreases, and the strict feed restriction methods such as April 3 and May 2 in the previous period have been transitioned to the daily feeding. The discharge rate is accelerated and the material amount is gradually increased. It is appropriate to increase the amount of material in each week from 5 to 8 grams per chicken, normally 2 to 3 times per week, each time the chickens do not exceed 3 grams each time, and the appropriate amount of starting material is gradually reached because this stage If the restriction is too strict, it will lead to extreme delay in sexual maturation. If overfeeding after 19 weeks to 20 weeks, it will lead to structural abnormalities of the broiler chickens. The reserve material gradually transitions to the pre-production material: the rapid development of the breeder's pre-production period requires that the nutrient level in the feed must be increased, the crude protein level in the reserve material is low (about 15% to 16%), the crude fiber content is high, and the amino acid level is low. Calcium content is low, various indicators can not meet the nutritional needs of the pre-production period; therefore, in the 18 weeks or so must transition from the reserve material to the pre-production material, it can promote the development of follicles, the formation of medullary bone (medium bone is a reserve of calcium (Library) allows the young hens to store sufficient nutrients and stamina in the body before the birth, and at the same time, the pre-production stage (generally 18 to 23 weeks) can increase the use of pre-produced material in the pre-production stage to increase the high-calcium fodder Adaptability to minimize the occurrence of nutritional diarrhea.
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