6 EFFECTIVE WAYS TO PREVENT BONE DEGENERATION IN LAYING HENS
Bone degeneration in laying hens is one of the common problems in modern poultry farming, especially in high-yield flocks or those with extended production cycles. This condition not only affects the mobility of hens but also directly impacts egg production performance, eggshell quality, and overall farm profitability.
In practice, many laying hens show signs such as difficulty walking, weak legs, frequent falls, or spending more time sitting or lying down than standing. These are typical symptoms of bone degeneration in laying hens, occurring when the bone structure of the legs is damaged due to mineral deficiencies, especially calcium.
In laying hens, more than 90% of the body’s calcium is stored in the bones. This calcium reserve is also an important source used to form eggshells when dietary intake is insufficient. If the deficiency persists, the calcium stored in bones is continuously mobilized, making bones weak and brittle and leading to bone degeneration in laying hens.
To reduce the risk of bone degeneration in laying hens and maintain stable flock health throughout the laying period, farmers should apply the following measures:
1. Adequate calcium supplementation during the growth stage
Providing sufficient calcium for pullets is crucial for developing strong bones, thereby preventing the risk of bone degeneration before the birds enter the laying phase. In particular, the period from 16 to 18 weeks of age is considered critical for preventing bone degeneration in laying hens, as this is when the body begins preparing for egg production.
The most common calcium source today is limestone due to its low cost and ease of inclusion in diets. However, calcium supplementation must be done at the right time and dosage. Excessive or premature supplementation may negatively affect the birds’ later mineral absorption capacity.
Therefore, farmers should formulate appropriate diets that meet bone development needs while avoiding unnecessary mineral excess.
2. Adjusting calcium levels throughout the laying cycle
The calcium requirement of laying hens is not fixed; it changes depending on the growth stage and egg production rate. When egg production increases, calcium demand also rises to support eggshell formation.
In practice, calcium content in limestone varies considerably, ranging from 22% to 38% depending on the raw material source. Therefore, farmers should select stable limestone sources with clearly analyzed nutritional composition to ensure diet consistency.
Pure calcium carbonate is considered the best calcium source due to its high absorption rate and low impurity content. In addition, storing sufficient limestone for the entire laying cycle helps avoid variation in raw material quality between batches.
3. Balancing essential minerals for bone health
Not only calcium, but many other minerals also play important roles in bone health and egg production performance.
Phosphorus supports bone formation and maintenance. Magnesium is involved in mineral metabolism in the body. Sodium and chloride help maintain electrolyte balance and normal physiological functions in hens.
Trace minerals such as manganese are also essential for bone formation and eggshell quality. If the diet is imbalanced in these minerals, calcium absorption can be significantly reduced, increasing the risk of bone degeneration and lowering production efficiency.
Therefore, formulating a balanced and complete mineral diet is essential in modern laying hen farming.
4. Vitamin D supplementation to enhance calcium absorption
Vitamin D plays a very important role in helping the body absorb and utilize calcium effectively. Without sufficient vitamin D, even if the diet contains enough calcium, the body cannot absorb it properly, leading to bone mineral deficiency.
Currently, many vitamin D products are available on the market with varying quality and effectiveness. Therefore, farmers should choose reputable products with clear origins and use them according to manufacturer recommendations.
Proper vitamin D supplementation not only strengthens bones but also improves eggshell quality, reducing thin-shelled or easily cracked eggs during collection and transport.
5. Combining fine and coarse limestone appropriately
A widely applied nutritional solution is combining fine and coarse limestone in the diet of laying hens.
Fine limestone is quickly absorbed, while coarse limestone remains longer in the digestive tract, providing a steady calcium supply throughout eggshell formation, especially at night when hens do not eat.
However, the optimal ratio of fine to coarse limestone may vary depending on breed. White-egg and brown-egg layers may differ in mineral absorption capacity. Therefore, farmers should follow guidance from breed suppliers to apply the most suitable ratio for their flock.
6. Organic acid supplementation to maintain calcium absorption in older hens
In flocks with long production cycles or high egg output, calcium absorption capacity often declines with age. This increases the risk of bone degeneration in later stages of the laying cycle.
Proper supplementation of organic acids can improve gut environment, enhance mineral absorption, and support bone health in older laying hens.
This is considered an effective supportive solution in modern production systems, especially as many new breeds are now designed for up to 500 eggs per lifetime.
Bone degeneration in laying hens significantly affects flock health, eggshell quality, and farm profitability. The main cause is calcium deficiency and dietary mineral imbalance.
To effectively prevent bone degeneration, farmers must ensure adequate supplementation of calcium, vitamin D, and essential minerals, while applying appropriate nutrition strategies for each production stage.
When protected from bone degeneration, laying hens maintain strong skeletal systems, stable mobility, consistent egg production, and good eggshell quality, thereby contributing to sustainable poultry farming efficiency.
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