Several problems that laying hens have to pay attention to
Many places in China are accustomed to keeping white and white hens. Because of the physiological sensitivity of white hens and the randomness and extensiveness of feeding management, the oyster slaughter rate (which can be as high as 15% or more) remains high. Seriously affected the economic benefits of farmers and feeding enthusiasm. How to properly raise and manage chickens is particularly important depending on the characteristics of the species. 1, low-density feeding. Early chickens are weak and weak, and when the feeding position is insufficient, the birds with larger weight gain more granular pods, corn, etc. The chickens eat more of the powdery hydrogen-calcium and vitamins. Become thin, causing pubic bone and other stunting. Early stunting was extremely difficult to make up in the late period and the chickens were poor in orderliness. It was common for chickens to have prolapsed anal fistulas and licking of the anus. It is required that every chick at 0 to 7 days of age should have a 2.5 cm feeding position; 8 to 14 days of age at 3 cm; and 14 days at 3.5 cm. To group early, grouping in place at the age of 14 days, to ensure that the 35-day-old body weight of 350 grams or more, the uniformity of not less than 80%. 2. Ensure that the earlier the 9th week, the better the zygomatic bone length. The length of the sacrum represents the developmental state of the whole body. The longer the length of the sacrum, the larger the skeleton of the chicken, the more perfect the pubic bone development, the larger the gap, the less prolapse of the rectal prolapse and squealing. It is required that the iliac bone should reach 84-86 mm within 8 weeks, and the length of the sacrum should reach the above-mentioned standard at the latest 9 weeks. In order to ensure that the length of the iliac bone is up to standard, we must change the habit of seeing the age of chickens, use chicken premix to the patella length of 84 ~ 86 mm (chicken premixed calcium hydrogen phosphate and other non-phytate phosphorus rich, and young chicken feed The available phosphorus, such as calcium hydrogen phosphate, is relatively low, and it is necessary to use the added phytase to convert phytate to phosphorus. If the young chicken feed is replaced prematurely, it will affect the transformation due to the incompleteness of the chicken, which will affect the bone development.) According to the observation of culture, layer chickens whose body weight is up to standard and their length is not up to standard are obese, their egg production volume is small, they are prone to rectal prolapse, the peak height is not high, the peak period is short, and the whole rate of death is high; Not up to the standard and up until the standard, such laying hens are often too thin to open production later, but the peak height and duration will not have much impact; 12-week-old length and weight are synchronized, this chicken The subsequent potential for egg production is not bad. 3. Ensure that chicks and young chickens are balanced and comprehensive. The poorer nutritional feed, the greater the pressure on the flock to compete and the worse the flock uniformity. Farmers must first choose the quality of their feed when selecting feedstuffs, especially the chicks and young chickens. Take 5% premix as an example. Even if the premix is ​​expensive at RMB 800/ton, the full price feed is only RMB 0.04/kg. As for the length of the cheekbones, each chicken eats about 3 kilograms, each spending less than 0.12 yuan. It is precisely this rational investment that ensures the healthy development of the flock. The brooding stage requires that the crude protein content of the feed should be 19% for 0-35 days, metabolisable energy 2900 kcal/kg, available phosphorus 0.37%, calcium 0.9%, lysine 1.05%, and methionine 0.44%; 35 days to the tibia The crude protein content of the feed reaching the target length reached 18%, metabolic energy 2850 kcal/kg, available phosphorus 0.37%, calcium 0.9%, lysine 1.0%, and methionine 0.42%. 35 days ago recommended adding high quality soybean oil 1% to 1.5%, VC5 ~ 10g / 50 kg full price feed, 35 days old body weight up to standard withdrawal of oil, withdrawal VC, continue to use chick premix, until the length of the zygomatic bone. 4, control the light. 1> For autumn and winter chicks, it is necessary to grasp the weight of less than 1,400 grams or more. Do not artificially increase the light. Add about 15 minutes per week when the body weight is up to the standard. Do not add light to the spring. When the egg production reaches less than 90%, the total The lighting time should be controlled within 14 hours. 3> The window area of ​​the chicken house should be controlled within 9% of the area of ​​the chicken house. The south should reduce the use of the fully open chicken house. For the lighthouse, use a shade net. 5. The addition of soybean meal in the opening period should be gradual. In order to prevent the prolapse of the anus caused by an oversized egg, the crude protein should not be added after replacing the egg yolk material. For every 20% increase of the egg production rate of the chicken, 1% of the soybean meal should be increased as appropriate until the peak diet. 6, to ensure the supply of sulfur amino acids such as methionine. It is not possible to control the weight of eggs and reduce the incidence of prolapse of the anus simply by artificially reducing the addition of protein ingredients such as soybean meal. Each recipe is a product of amino acids and other nutrients in the large-formulated raw materials that are complementary to other nutrients in the premix used. Many farmers commonly use lower crude protein formulas because of fear of anal fistula. Because of the lack of sulphur amino acids in the diet, such as methionine, there is a more serious scrofula phenomenon. In order to ensure the supply of methionine, etc., for the addition of less than 18% of soybean meal, 500-1000 grams of methionine per ton of feed should be added, especially in summer. 7. Feeding in groups. Relative to the chicken's weight, the evenness difference is even more terrible, the solution is only the size of the separate feeding, small to be deployed above the cage alone feed, do not reach the standard, do not increase the stone and other calcium, and add 1% About high quality vegetable oil. 8, pay attention to the balance of protein energy. After the start of production, ensure that the feed metabolism is not lower than 2,700 kcal/kg, the protein/energy ratio is about 14.3~14.6 MJ/g (crude protein is 16%~16.5%), and 0.5%~1% of high-quality vegetable oil is added to ensure production. Eggs have plenty of energy. It is forbidden to use feed formulations with low protein, low energy, and high protein to energy ratios.
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