Chicken can not add calcium

Laying hens require a large amount of calcium and phosphorus during the laying period. About 90% of calcium is used in bones and eggshells. About 80% of phosphorus forms bones together with calcium. The rest of calcium and phosphorus are distributed in tissues of the body. Egg shells account for about one-tenth of the egg weight, and 90% of the shells are calcium carbonate. A weight of about 50 to 60 grams of egg calcium carbonate content of 4.5 to 5.4 grams, according to the utilization of calcium conversion of 60%, each producing an egg about 10 grams of calcium carbonate, 3.5 grams of pure calcium. However, body calcium in chickens is limited to about 15 grams. According to egg production, hens (including bone calcium) are only required to produce 3 to 4 eggs, so they need a lot of calcium. However, in the calcium supplement, we must choose the source of calcium. 1. Don't be able to feed raw meal Because the production process of processed bone meal is different, the quality of its products is very different, so there is the difference between steamed bone powder and raw meal. Steamed batter is a product that has been processed, removed of most of the protein and fat, and pressed, dried and crushed. Steamed bone powder is white or silver grey, no odor, 30% calcium, 14.5% phosphorus, 7.5% crude protein, 1.2% crude fat. The so-called bone meal is a kind of inferior bone meal that is produced under conditions of poor equipment. It is a simple flush of the bones and then cooked in a cauldron for several hours without pressure or degumming. Then remove the pan, dry it, and pulverize it. This bone powder has an odor, black or dark gray, 23% calcium, 10.5% phosphorus, 21% crude protein, 5% crude fat. If you use this kind of bone meal for a long time to feed hens because it has not been treated with high temperature and high pressure, bone calcium is combined with bone glue, and the calcium absorption and utilization of chicken body is much worse than that of steamed bone powder. A long time will cause the imbalance of calcium and phosphorus in the chicken body, resulting in a decline in laying ability of laying hens and causing significant economic losses to chicken production. Therefore, chicken farmers, especially large-scale chicken farms, must pay attention to avoid feeding chicken with raw bone meal ingredients. 2. Can not feed sheep's bone powder In places where there are more sheep, people often process sheep bone into sheep bone powder and add it to livestock and poultry feed to replace other bone meal. This is okay for most livestock and poultry, and it works well, but it is not enough for laying hens. Because the egg shell is formed in the chicken body, the temperature should not be too high. The sheep bone powder is hot. When taken up by laying hens and involved in egg shell formation, the temperature in the chicken will increase. This will not only affect the formation of egg shells, but will also reduce the egg production rate. Therefore, laying hens cannot feed sheep bone powder. 3. The best choice for coarse-grained calcium sources During the laying of eggs, the addition of calcium to the diet should be supplied in the form of shells or coarse-grained limestone, because this granular calcium leaves the stomach much slower, strengthening the formation of egg shells at night. Eggshell strength works well. Stone powder. Limestone powder, natural calcium carbonate. Generally containing about 38% of pure calcium, is the cheapest calcium mineral feed supplement, and other more pure commercial calcium carbonate, chalk and old lime also have the same effect as stone powder. Shell powder. When shell powder is used as a calcium source feed, attention should be paid to the use of seashells that have accumulated on the seashore for many years, because after a long period of accumulation, the incidental organic matter has disappeared and there are fewer germs; fresh shells should be disinfected because of the corruption of proteins and the attached bacteria. , More viruses, unsterilized often cause disease in chickens. General shell powder contains about 96.4% calcium carbonate, equivalent to 38.6% calcium. After choosing the right source of calcium, calcium should also pay attention to: calcium supplementation of hens, not more. Generally, about 4.8 grams of calcium per hen are needed to produce one egg. If the calcium content in the diet exceeds 4%, on the one hand, urate will accumulate in the body, causing indigestion to cause diarrhea and even symptoms of gout; on the other hand, It will make the palatability of the feed poor, and the feed intake and egg production of the flock will decrease. Therefore, the calcium content in laying hens is generally 3.0% to 3.5%, and the feeding source can be placed separately, and the chickens can be eaten or mixed in the feed. Under stress, vitamin C can also be added, which can promote the secretion of calcium from the bone marrow, and can also activate vitamin D3, which not only contributes to the improvement of the egg shell quality, but also can increase the egg content. The amount of vitamin C in the diet should be 50 mg per kilogram of feed. (Hejian City Livestock Husbandry Bureau)