Several discussion topics about laying hen feed and laying hen breeding

The subject of "practical breeding Technology and Feed Formula Design of laying Hens" officially opened in the 100 forums of the Animal Husbandry Forum. This is also an opportunity for me to exchange and learn. I hope to receive your advice, attention and support from my predecessors and colleagues in the industry. I would like to express my thanks in advance. In order to make this section unique, better serve and solve problems for laying hen feed enterprises and farmers, this paper puts forward several discussion topics: 1, the main factors affecting the benefit of laying hens and improvement measures; 2, the non-disease factors and improvement measures leading to the decline of laying rate of laying hens; 3, the true requirement and influencing factors of methionine in high-yield layers 4. Calcium metabolism, true requirement and feed calcium digestibility of high-yield laying hens. 5. Why is the fecal water content of laying hens much higher than that of chicks and young hens? The main factors affecting the fecal water content of laying hens and the improvement measures. The stage has been set up. It's a good opportunity. I hope you can communicate more-- how to discuss it, in this section?-- I hope you can share your valuable experience and opinions. I would like to throw a brick at first. Why is the fecal water content of laying hens much higher than that of chicks and young chickens? -- mainly because: 1. The feed of laying hens contains high calcium, but the needs of laying hens for calcium are uneven. A large amount of calcium is needed to form eggshells at night, and part of the absorbed calcium is fully utilized and used to store calcium. During the day, only a maintenance amount of calcium is needed. After calcium absorption, most of the calcium in the feed is excreted from the kidney except for some supplementary storage calcium, and the solubility of calcium is low. In order to get rid of excess calcium, you need to drink a lot of water to help with excretion. 2. The need for protein in laying hens is also uneven. A large amount of protein is needed to form egg white in the morning, but only in the afternoon and evening. In this way, in the afternoon and evening, in addition to a small part of the protein in the feed is used to replenish body storage, most of the protein is converted into energy metabolism, and the nitrogen contained in it is excreted through the kidney. Similarly, the solubility of uric acid is also very low. Large amounts of water are also needed to help with excretion. 3. The demand for electrolyte sodium ion of laying hens is 25% higher than that of chloride ion, while the content of chlorine in table salt, as sodium and chloride ion, is 50% higher than that of sodium, and the chlorine in large raw materials is about twice as high as sodium ion. Therefore, when using salt to supplement sodium ions and meet the needs of sodium ions, chloride ions have been seriously excessive (often ignored), and layers also need to increase drinking water in order to expel excess chloride ions. Improvement measures: 1. Feed a diet high in protein (18%) and low in calcium (1.5%) in the morning, and low in protein (11%) and high in calcium (4.5%) in the afternoon and evening; 2. Include electrolyte balance in the feed formula design: laying hens diet added 0.2% salt + 0.12% sodium bicarbonate. -- Hello, brother Xie! Several farmers reflect the phenomenon of not going up more than 90% during the peak period, and some eggs are not good at whitening. Basic situation: breed: Highland brown (pink shell layer breed) age: 170d (24 weeks old) weight: 3.23.5jin laying rate: 80-85% feed intake: 100-105g/ daily calcium source supplement: shell powder large raw material: corn 62 soybean meal 25 shell powder 8 premix 5, the source of supply is basically the same, please give more advice. Hello, Brother Hu! Where is the high school now? I haven't been in touch for a long time. Did you do well? In the future, more contacts (13308411176) do not remove more than 90% of the phenomenon during the peak period, and some eggs are not good at whitening. If this batch of chickens has not had an epidemic before and their development is basically normal, it is certain that the health care work of young chickens has not been done well, and the fallopian tubes and ovaries of some laying hens have been infected by intestinal pathogenic bacteria, that is to say, some chickens have inflammation in their fallopian tubes and ovaries. Egg shell whitening is the manifestation of tubal inflammation, if the ovary has inflammation, the follicles can not normally develop, ovulate and lay eggs. Solution: anti-inflammation of fallopian tube (the method has been detailed in the daily feeding and management of laying hens); increase the addition of dihydropyridine (total 150ppm) and betaine (0.2% of total betaine hydrochloride). For those layers whose ovaries have been infected, it is impossible to recover from laying eggs in the future (because the ovaries do not have this repair function), the only way is to pick them out and eliminate them. (if there are still some chickens that are not well developed, the elimination work will be postponed.) I might as well give it a try and remember to tell me what the result is. -- the whole use environment is the same, and the problem of shell powder is what I have been worried about all the time. The main reason is that the probability of this phenomenon is not high at present, and it should occur at the start of production. At the same time, it should be more obvious when the temperature is highest from July to August? -- A rare opportunity! Study hard! Study Mr. Hu's pulpit conscientiously! I hope to be your student. -- Thank you for your teaching. I will study hard and hope to be a good formulator. Hehe-- well, the opportunity is rare! Study hard! Study hard. Thank you, landlord.