Laying hens laying period
1 The effect of calcium on laying hens in the laying period
Calcium is an important mineral element to ensure high yield and stable production of laying hens. Laying hens require large amounts of calcium during laying, and about 90% of them are used for bones and eggshells. The eggshell is mainly composed of inorganic matter and organic matter. The inorganic matter is mainly calcium carbonate (about 95%). The quality of the eggshell depends largely on the supply of calcium in the diet and the absorption and utilization of calcium by the laying hen. Happening. Adult hens maintain a daily intake of 0.17g of calcium, and an egg requires 2.0-2.2g of calcium. The absorption rate of calcium in the first half of the laying period is 55%-60%, and the post-production period is reduced to 40%. Eggs need to eat 4.0-4.4g calcium, but the calcium in the chicken is only about 15g. According to the egg production, the hen body (including bone calcium) only needs 3-4 eggs, so it needs a lot of supplement. calcium. If the intake of laying hens is insufficient calcium, the flocks are susceptible to rickets, the eggshell quality and egg production rate decrease, and a certain number of soft shell eggs and thin shell eggs appear, especially at the peak of laying eggs. Prominent because the quality of the eggshell is largely dependent on the bone condition of the chicken, and the laying hen dynamically undergoes calcium metabolism due to the formation of the eggshell. For hens with high egg production rate, if the supply of calcium is not enough, a thin eggshell will appear after 4 days, and then the ribs may collapse, resulting in osteoporosis in the cage. The increase in calcium in the diet does not further increase the egg production rate, but can improve eggshell weight and eggshell thickness. However, when the calcium content in the diet exceeds 4%, it will seriously affect the performance of the chicken. On the one hand, it will cause the accumulation of urate in the body, causing dyspepsia and even gout symptoms; on the other hand, the palatability of the feed will change. Poor, flock feed intake and egg production decreased.
2 Adding calcium during laying period
The need for calcium has also changed due to seasonal and feed intake, egg production rates, and age. In general, it is advisable to use a feed containing 3.0%-3.5% calcium from 5% egg production to 280 days old, and it is reasonable to increase or decrease the addition of stone powder in summer and winter. The specific method of adding calcium during laying period: 1 The calcium source is mainly stone powder, which can be placed separately. Any chicken can be eaten freely or mixed with feed. 2 Under stress, VC can be added, and VC can promote calcium from Secretion in the bone marrow can also activate VD3, which not only helps to improve the quality of the eggshell, but also increases the contents of the egg; after 3280 days of age, the amount of calcium added is increased to about 3.8%, generally an additional 1% - 1.5% stone powder.
Calcium is an important mineral element to ensure stable production and high quality of laying hens and egg quality. Laying hens need to adopt different calcium addition modes at different stages. Regardless of the mode, it is necessary to pay attention to the calcium/phosphorus ratio, because phosphorus is not directly required for eggshell formation, but it is necessary to supplement calcium in the bone marrow, and any unilateral deficiency can cause serious damage. At the same time, it is also necessary to pay attention to the addition of VD, because VD plays an important role in the absorption and synthesis of calcium. Choosing high-quality calcium source and reasonable calcium supplement are important measures to effectively improve the performance and economic benefits of laying hens.
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