First, choose 1. Rooster's choice of cock should be large, majestic, mulberry crown large and blue-purple, chest wide and straight, bones strong, loud vocal, aggressive, strong mating ability. 2. The hen's choice hen should be mulberry crown large and blue-purple, anal large and moist and soft, often half-open state, the distance between the pubis is large enough to accommodate more than 3 fingers, the abdomen is large and soft, late and fast plumage, breast muscle Developed, delicate and smooth skin, stout legs, strong, claw straight, poor hold. Second, mating is currently generally used homogenous matching to purify and rejuvenate. In addition, the hens that laid eggs for the first year were selected as breeding chickens. There are two kinds of mating methods: natural mating and artificial insemination. Are there two forms of natural mating?(1) Large group breeding. Bring the rooster to the proper ratio of male and female and let the male and female chickens naturally mate. In this way, the fertility of hens is high, and the management is also simple. They are mostly used in commodity production groups. (2) Small group breeding. According to the needs of breeding or seed production, a small group of chickens with a ratio of 8 to 15 hens should be selected. The breeding of caged silky fowls should be subject to manual collection and insemination in order to make full use of excellent roosters to increase the fertility rate. The suitable ratio of male and female chickens is 1:60-80. The average amount of ejaculate for a cock is 0.6 to 1 ml. Each insemination volume of a hen was 0.025-0.035 ml of fresh semen, and 0.03-0.05 ml of diluted semen from 1:1 to 3. The insemination frequency of hens was 4 to 5 days, and the frequency of sperm retrieval was 3 to 7 times per week. The preservation temperature of fresh semen is 36-39°C. Semen collection method: training mature sexual rooster 1 or 2 times a day, continuous training for 5 to 7 days, timely elimination of semen without semen or sexual reflexes, and cutting off the diameter of the anus around 5-7 cm before harvesting In the feathers, the assistant holds the two legs of the rooster with both hands, so that the rooster's head is backwards, the tail is toward the sperm extractor, and the rooster body is kept horizontal; the spermatozoa's left hand strokes several times in the direction of the tail feathers, and then the left hand is homeopathically flipped. The palm of the hand turns the tail feathers to the dorsal side, and clamps both sides of the cloaca with the thumb and forefinger. The right thumb and index finger rapidly vibrate to massage both sides of the lower abdomen of the cloaca. At this time, the cock pulls out the degenerated penis, and the sperm extractor uses the left thumb and The index finger is pressed slightly on both sides of the cloaca to allow the semen to drain smoothly, and the spermatozoa are held in the right hand holding the collection cup. Insemination method: the assistant holds the hen's wings with her left hand and raises her anus upwards. The chicken head is lifted downwards. The right palm is placed under the pubic bone. A slight pressure is applied to the abdomen. The fallopian tube inside the cloacae is pulled out. The inseminator will be inserted into the mouth of the vagina 2 to 3 cm, the semen slowly injected, the assistant at the same time to relax the pressure on the hen's abdomen to avoid semen spillage. China Agricultural Network Editor
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