Spring laying hens prevent excessive calcium supplementation

Laying hens need a lot of calcium and phosphorus in the laying period. About 90% of the calcium is used for bones and eggshells. About 80% of the phosphorus forms bones together with calcium. The rest of the calcium and phosphorus are distributed in the tissues of the whole body. The eggshell of the laying hen accounts for about one tenth of the egg weight, of which 90% of the eggshell is calcium carbonate. A weight of about 50 to 60 grams of egg water content of calcium carbonate 4.5 ~ 5.4 grams, according to the utilization rate of calcium is 60% conversion, for each egg produced about 10 grams of calcium carbonate, 3.5 grams of pure calcium. However, the body body calcium is limited to about 15 grams. According to the egg production requirements, the hen body (including bone calcium) is only enough to produce 3 to 4 eggs, so a large amount of calcium is needed. But when supplementing calcium, you must choose the source of calcium. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

Can not feed raw bone powder nAw China feed industry information network - based on feed, service animal husbandry

Since the production process of processed bone powder is different, the quality of the products varies greatly, so there is a distinction between steamed bone meal and raw bone powder. Steamed bone meal is a product obtained by processing, removing most of the protein and fat, and pressing, drying and pulverizing. The steamed bone meal is white or silvery gray, and has no odor. It contains 30% calcium, 14.5% phosphorus, 7.5% crude protein, and 1.2% crude fat. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

The so-called raw bone powder is a kind of inferior bone powder produced under the condition of simple equipment. It is to simply rinse the miscellaneous bone and cook it in a large pot for several hours without pressing or degumming, then remove the pot, dry it, and smash it. This bone powder has an odor, black or dark gray, containing 23% calcium, 10.5% phosphorus, 21% crude protein, and 5% crude fat. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

If this raw bone powder is used for long-term feeding of laying hens because it has not been treated with high temperature and high pressure, bone calcium is combined with bone glue, and the absorption and utilization of calcium by 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, which will lead to a decline in the laying ability of the laying hen, which will cause significant economic losses to the chicken production. Therefore, chicken farmers, especially large-scale chicken farms, must pay attention to avoid feeding chicken with raw bone powder. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

Second, can not feed sheep bone powder nAw China feed industry information network - based on feed, service animal husbandry

In places where there are more sheep, people often process the sheep bone into sheep bone powder and add it to the livestock and poultry feed instead of other bone powder. This is okay for most livestock, and the effect is good, but not for laying hens. Because the eggshell of the egg is formed in the chicken body, the temperature is not too high. The sheep bone powder is hot. When absorbed by the laying hen and involved in the formation of the eggshell, the temperature in the chicken will increase. This will not only affect the formation of the eggshell, but also reduce the egg production rate. Therefore, laying hens cannot feed sheep bone meal. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

Three best choice coarse grain calcium source nAw China feed industry information network - based on feed, service animal husbandry

During the laying of the egg, the calcium added to the diet should be supplied in the form of shells or coarse-grained limestone, because this granular calcium leaves the muscles at a slower rate and works well for strengthening the eggshell strength that forms the eggshell at night. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

Stone powder. That is limestone powder, natural calcium carbonate. Generally containing about 38% pure calcium, it is the cheapest mineral feed for calcium supplementation. Other pure commercial calcium carbonate, chalk and old lime also have the same effect as stone powder. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

Shell powder. Use shell powder as a calcium source feed, should pay attention to the use of shells that have been stacked for many years on the seashore, because after a long time of accumulation, the organic matter attached to it has disappeared, and there are few bacteria; fresh shells should be disinfected because of protein spoilage and attached bacteria. There are many viruses, and it will cause diseases to chickens without disinfection. Generally, the shell powder contains about 96.4% of calcium carbonate, which is equivalent to 38.6% of calcium. nAw China Feed Industry Information Network - based on feed, serving animal husbandry

After choosing a suitable calcium source, you should also pay attention to calcium supplementation: not more calcium is added to the hens. Generally, hens need about 4.4 grams of calcium for every egg they produce. If the amount of calcium in the diet exceeds 4%, it will cause urate to accumulate in the body, causing dyspepsia and even gout symptoms. It will make the palatability of the feed worse, and the feed intake and egg production of the flock will decrease. Therefore, the content of calcium in the laying hens is generally 3.0% to 3.5%. The feeding source can be placed separately, and the chickens can be used for feeding or mixed with the feed. Under stress, vitamin C can also be added to promote the secretion of calcium from the bone marrow, and it can also activate vitamin D3, which not only helps to improve the quality of the eggshell, but also increases the contents of the egg. The amount of vitamin C in the diet is preferably 50 mg per kg of feed. nAw China Feed Industry Information Network - based on feed, serving animal husbandry