The nutritional needs of captive laying ducks are entirely dependent on the supply of full-priced commercial feed. To maintain the egg production rate and increase the egg production rate of the captive ducks, it is necessary to pay attention to calcium supplements in addition to meeting the needs of protein and energy nutrition. First, as long as the normal development of calcium, part of the circle of laying ducks began to produce eggs around the age of 100, therefore, 15 weeks of age is the best time for calcium. Calcium should be between the young duck and the laying duck, with an appropriate rate of 2.5%, and gradually increase thereafter. Second, the best calcium in each stage of egg production ducks of calcium utilization rate of 65% or less, the calcium is 2.5% is appropriate, and then gradually increase. Third, choose a good source of calcium Calcium source is more extensive, generally limestone, shells as the main source of calcium, and the proportion of more economic than appropriate. Practice has proved that: the proportion of stone powder and shell powder is appropriate to 2:3, and feeding 1% of bone powder, the strength of the eggshell is the best. Fourth, the shape of calcium supplement granules Calcium in the digestive tract for a long time to stay in the eggshell formation phase can be even when the calcium, granular calcium in the stomach similar to the grinding effect of sand, can promote the digestion and utilization of feed. Practice has shown that using 50% shells in combination with 50% limestone can help ducks absorb calcium well.
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