The path to peak production: Development of laying hens.
The growth and development of laying hens is a complex and well-structured process that encompasses several key phases, each with its specific importance in ensuring that the birds reach their full productive potential. The provided graph visually shows how each of the body systems of the hens develops over their first 25 weeks of life, with each system being crucial at different stages of their growth. Below, we will explore each of these phases in detail.
1. Digestive development.
The development of the digestive system is one of the first priorities in the life of laying hens. During the first weeks, this system develops rapidly to ensure that the birds can efficiently absorb the essential nutrients needed for their growth. Around week 5, the digestive system reaches its peak development, indicating that at this stage, the digestive apparatus is prepared to support the increased demand for nutrients that will be necessary for subsequent growth processes, such as muscle and skeletal development.
2. Strengthening the immune system.
Simultaneously with digestive development, the immune system of the hens also strengthens significantly during the first weeks of life. This early development is crucial as it provides the necessary protection to resist infections and diseases, a vital factor in ensuring the birds’ long-term survival and health. Immune strengthening during these initial stages is essential to establish a solid foundation that will allow the birds to successfully face the challenges they will encounter as they grow.
3. Skeletal growth.
Skeletal development is one of the most important and complex processes in the growth cycle of laying hens. This development reaches its peak between weeks 10 and 15, a critical period during which bones are forming and strengthening. During this phase, the physical structure necessary to support body weight and the muscle growth that will intensify later is established. A strong skeleton is essential not only for the bird’s mobility and overall well-being but also for its future egg production capacity.
4. Muscle development.
After skeletal development has peaked, muscle growth becomes the priority. This process intensifies between weeks 12 and 15, coinciding with the decline in skeletal growth. Muscle development is essential for increasing body mass, which is particularly important for productivity in terms of meat in birds destined for meat production or those requiring good body condition for egg production. Proper muscle development ensures that the birds have the strength and endurance necessary for their productive function.
5. Cortical bone formation.
Cortical bone, which provides the structure and strength necessary for the physical support of the body, continues to develop even after the peak of main skeletal development. This type of bone is essential for ensuring the physical integrity of the bird, allowing it to support the continuous growth of muscle tissue and the weight added as the bird matures. The ongoing formation of cortical bone is crucial for maintaining long-term bone health, especially in birds that will be subjected to intensive egg production.
6. Medullary bone development.
Medullary bone has a specialized function in laying hens, as it is directly related to the production of calcium necessary for eggshell formation. This type of bone begins to develop later in the growth cycle, reaching its peak just before the reproductive period begins. Proper development of the medullary bone is essential to ensure efficient egg production with high-quality shells, which is crucial for the productive success of laying hens.
7. Fat deposition.
Fat deposition in hens intensifies as they approach sexual maturity. This process reaches its peak towards the end of the growth cycle and is important for several reasons. First, fat reserves provide a crucial source of energy for the birds, especially during egg production. Additionally, the amount and distribution of fat can affect the quality of the final product, whether in terms of meat or the eggs produced. Therefore, proper management of fat deposition is vital to ensuring efficiency and quality in production.
8. Reproductive development.
Finally, the reproductive development of the hens intensifies in the last weeks of the growth cycle, just after the peaks of skeletal and muscle development have been reached. This process prepares the birds for egg production or reproduction, depending on the purpose of the poultry operation. Proper reproductive development is essential to ensure high egg-laying productivity and to maintain the overall health and well-being of the hens throughout their reproductive life.
9. Physiological decline.
As laying hens age, they experience a decrease in digestive efficiency, bone strength, and egg production. Nutrient absorption becomes less efficient, increasing the risk of body condition loss, while reduced bone density raises susceptibility to fractures. Additionally, the laying rate gradually declines along with eggshell quality. Proper management at this stage is key to maintaining productivity and the well-being of the birds.
The growth and development cycle of laying hens is an intricate process in which different body systems develop in synchrony to ensure that the birds reach their full potential. Each phase of this development is carefully timed to support the next, ensuring that the hens have the structure, strength, and health necessary for their productive function. Understanding this cycle is essential to optimizing the management and feeding of laying hens, which ultimately leads to successful and sustainable poultry production.
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