Egg duck rearing scientific calcium supplement

In order to improve the laying rate and the commodity rate of egg products of captive laying ducks, we should not only meet their needs for protein and energy nutrition, but also supplement calcium scientifically. This includes the following aspects:

Limestone and shell are the main sources of calcium, but the proportion of stone powder to shell powder should be appropriate. The ratio of stone powder to shell powder is 2 ∶ 3. When 1% bone meal is added, the strength and smoothness of the eggshell are the best.

The time of calcium supplement is suitable for captive laying ducks to start laying eggs at about 100 days old, and the best time to start calcium supplementation is 15 weeks old. Calcium supplement should be between young ducks and laying ducks, 2.5% is appropriate, and then gradually increase.

The optimum amount of calcium supplement for each laying stage the utilization rate of calcium in laying ducks is about 65%, and it takes 4.8 to 5.12 grams of calcium to lay an egg. Practice has proved that when the laying rate is less than 65%, the calcium is 2.5%; when the laying rate is 65% and 80%, the calcium is 3%; when the laying rate is more than 80%, the calcium is 3.2% 3.5%.

It is best to supplement granular calcium for a long time in the digestive tract, and can evenly supply calcium in the stage of eggshell formation. at the same time, granular calcium has a grinding effect similar to sand in the stomach, which can promote the digestion and utilization of feed. Practice has proved that 50% granular shells combined with 50% limestone can make laying ducks absorb calcium well.

The supply of vitamin D in the diet should be guaranteed (liquid cod liver oil or vitamin AD capsules can be used), and the ratio of calcium to phosphorus should be controlled at 5 ∶ 1 to 6.5 ∶ 1, which is beneficial to the absorption and utilization of calcium.