Grazing ducks in the grazing state have a large amount of calcium-rich live shellfish, so there is usually no problem of calcium deficiency, and captive laying ducks need to pay attention to calcium supplements. 1, choose a good source of calcium. Limestone and shells are generally used as the main sources of calcium, but the proportion should be appropriate. The ratio of lime and shell powder is appropriate to 2:3. Plus 1% of bone powder, the strength and smoothness of eggshell are the best. 2, calcium time should be appropriate. 15 weeks of age is the best time to start calcium supplementation. The supplemental calcium should be between the young duck and the laying duck, with an appropriate rate of 2.5%, and gradually increase thereafter. 3. The best amount of calcium in each stage of egg production. The reasonable supply of calcium to ducks: When the egg production rate is below 65%, calcium is 2.5%; when the egg production rate is between 65% and 80%, calcium is 3%; when the egg production rate is above 80%, calcium is 3.21%-3.5%. 4, make up the best calcium particles. With 50% of the shells and 50% of limestone, the ducks can absorb calcium well. In addition, the supply of vitamin D in the diet should be guaranteed, and the ratio of calcium to phosphorus should be controlled to 5-6.5:1. According to the egg production rate, it is necessary to ensure 14 hours to 17 hours of sunshine, which is beneficial to the absorption and utilization of calcium and increase the egg production rate.
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