Silky chicken is delicate in quality. It is rich in many amino acids and trace elements required by the human body. It can also be used as a medicine and has the effect of nourishing the kidney, benefiting qi and blood, and clearing away heat. Therefore, the development and utilization of silky chicken has a broad prospect for development. However, at present, the problem of low egg production is widespread in black bone chickens. The annual egg production is only 80 to 100 pieces, and individual high-yields can reach 140. After the general production, the average egg production rate is only 30% to 40%. , The egg production rate of the current three yellow chickens is about 20% lower. One of the main reasons leading to this lower egg production rate is that it has a strong nesting behavior. It shows that 15 to 20 eggs will be produced in the nest for 7 to 30 days, and the adult hen will be nested every year for 8 to 8 days. 10 times. To this end, domestic and foreign scholars conducted a large number of experimental studies, and obtained some effective techniques for controlling black bones in the nest. Specific technical measures are described below.
1 physical control method
1.1 Cold water bath method First, dip swarm chickens into cold water basins and isolate them with baskets to reduce chicken activity. Method two: immerse hens in small shallow water tanks with head and neck exposed to the water and use wooden slats between the legs. The joints are tied so that they are not flooded and flooded. Each half an hour can be repeated several times a day, usually 3-5 days.
1.2 pull out the maggots and chickens to wear a nasal method one, the hens were pulled out of the two wings of the three feather mane hair and have a small amount of bleeding, pull 2 ​​to 3 days away from the nest foraging, 10 days recovery of egg production; method two, will The long feathers on the tip of the wings pull off a nostril that crosses the chicken and stays unplugged after a few days. This method has a certain wake-up effect on the early nesting hens.
1.3 The cut-off tail fat method can be raised at the tip of the tip of the cock (commonly known as the tip of the chicken gill) on the tail gland 2 cm from the tip of the tail, cut a small spot with a sterilized pair of scissors, coated with salt; may also be sterilized Acupuncture needle vertically acupuncture point 3cm from the tip of the tip of the small lip at the end of the fat, to acupuncture does not enter so far, and left and right twisted several times during the day to stay in the needle, pull out the evening, back into the flock, effective for 3 days.
1.4 Rope strapping method With a leg of a rope hen, it is lifted halfway, making the chicken stand uneasy on one leg, panicking and urging to hold it.
1.5 Acupuncture palm method In front of the chicken's two-palm palm, use a sterilized coarse sewing needle to pierce 6mm deep to stimulate and hold the hair, 1-2 times a day, and wake up in 3 to 5 days.
1.6 Waking up frame method This is the method commonly used in production. An awake and hung hug is a large cage made of wooden boards. The bottom plate is made of fine wood and has a certain slope so that the chicken can't crouch. The black chicken that nests is caught in the cage and keeps the chicken away. Its familiar nest box, and can not comfortably crouching, using this method about 3 to 5 days to wake up.
1.7 Induction stimulating method Apply salt water to the cocks, place one end of the electrode into the mouth of the chicken, and the other end is in contact with the crow's beak. The 12-volt voltage stimulates the broody hen and continues to energize for 10 seconds. Intermittently for 10 seconds and then for 10 seconds. After several stimuli, the hens can wake up.
1.8 Cage Isolation and Light Stimulation The researchers found that both the cage isolation and the light stimulation method enabled the nesting hens to start waking up on the third day, and the waking up rates on the seventh day reached 40% and 70%, respectively.
2 Drug regulation
2.1 To feed the nest hens with human Dan, each of the chickens will have 13 capsules in the morning and in the evening. They can be fed for 3 to 5 days.
2.2 Oral pain tablets or metamizole was given. Each chicken was fed with 1 tablet (0.5 g) a day and could be held for 3 days.
2.3 Intramuscular injection of 0.02% copper sulphate injection, 1 ml per chicken, 1 or 2 times per day.
2.4 Irrigation of vinegar, each chicken fed 10ml vinegar daily, once a day, once every 2 to 3 days.
2.5 To feed white wine, each bun is fed with 2 tablespoons of white spirit to promote drunkenness. After sobering up, they can resuscitate the nest.
2.6 Apply cool oil, wipe the cool oil on the hen's face, make the chicken panic, and promote rousing. Be careful not to wipe in your eyes.
2.7 Quinine hydrochloride was fed and quinine hydrochloride tablets (1-2% each) were fed (0.12g/tablet) per day for 1 to 3 days.
2.8 Isoniazid was fed in the first dose of 0.08g per kilogram of body weight. For the returning hens, they were dosed on the 2nd and 3rd days, and the dose was halved compared to the first dose. Application of this method up to 95% hold up rate, but the drug has a certain degree of toxicity, the application of strict dose control, if there is poisoning, vitamin B6 can be taken internally, and with other symptomatic drugs.
2.9 Oral administration of chlorpromazine 150 mg, or salvicine 3 mg, or oral administration of 150 mg chlorpromazine and 30 mg salitrazine per day may inhibit prolactin secretion, reducing the nesting period from 22 days to 3 to 5 days. .
3 hormone regulation
3.1 injection of testosterone propionate, per kilogram of body, re-injection of testosterone propionate 12.5mg, generally 1 to 2 days after injection, waking, if not hold one more injection.
3.2 Injecting triple hormones, 0.1-0.2 ml per chicken, and 10-12 hours after injection.
3.3 Injection of human chorionic gonadotropin, each intramuscular injection of 200 ~ 500IU, once daily.
4 Immunoregulation Passive immunization of chickens with antibodies against prolactin (PRL) and vasoactive intestinal peptide (VIP) can quickly and effectively terminate the nesting behavior.
5 Genetic regulation Because the nesting of birds is controlled by genes, nesting can be controlled through breeding. In the long run, cultivating nest-resistant or low-lying chickens is the best way to solve the problem. Research on the control of the breeding of Jinshui black-boned chickens on their nesting has found that it is effective to control the nesting of black-bone chickens through conventional breeding, but with the increase of breeding generations, the progress of breeding will be slow, in the early stage of breeding. Progress has been large, and the egg production performance of the fourth generation chickens has continued to rise, while the egg production performance of the fifth generation chickens has declined slightly. It can be seen that conventional breeding methods need to control the duration of nesting and it is difficult to completely eliminate nesting.
Nesting behavior is one of the important maternal performances of the mother bird, but it brings great economic losses to the modern poultry industry. Because people still lack a deep understanding of the nesting mechanism, some wake-up techniques applied in production practice are empirical and lack theoretical basis. Further research is needed. In the normal feeding and management of black-bone chickens, for their strong nesting characteristics, the hens in the nest should be observed constantly during the laying period, and the hens found in the nest should promptly take appropriate measures to wake up and shorten the nests. The duration allows the hens to resume egg production as soon as possible.
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