The growth and development of broiler chickens is like building a house, with different "construction priorities" at different stages. Simply put, it can be summarized as: the first week determines their lifespan, the middle stage controls growth rate, and the later stage promotes rapid fattening.
The table below clearly shows the key points and characteristics of broiler chicken weight development at different ages:
|
Stages |
Core Development Focus |
Key Weight Targets and Characteristics |
Main Feeding Goals |
|
Brooding Period (0-3 weeks) |
Internal organs, immune system, skeletal foundation. |
Weight gain at the end of the first week is crucial; the target is 200 grams. Every 1 gram increase in weight at the end of the first week will result in an additional 10-15 grams at slaughter. |
Ensure weight targets are met at each age to lay a solid foundation for later growth. |
|
Mid-Stage (4-6 weeks) |
Skeletal framework, muscle tissue. |
Weight gain enters a rapid growth phase, but the rate of increase needs to be appropriately controlled.Weight should reach 380-450 grams by the end of the 4th week. |
Provide a nutritionally balanced diet to build a good skeletal structure and prevent disease caused by excessive weight gain. |
|
Fattening Period (6 weeks - Slaughter) |
Muscle growth, fat deposition |
Growth efficiency is highest, with extremely rapid weight gain. Modern broilers can exceed 3 kg at 56 days of age. |
Increase feed energy levels, allow free access to feed, achieve rapid fattening, and reduce the feed conversion ratio. |
Brooding Period (0-3 weeks):
Laying a Solid Foundation, "The First Week Determines the Future"
This is the most crucial period in a broiler's life, especially the first week.
"The first week determines the future":
The weight at the end of the first week is the gold standard for measuring the quality of early management. Reaching the target weight of 200 grams means that the chick's internal organs (such as heart, lungs, and intestines) and immune system are well-developed, providing a physiological foundation for subsequent rapid growth.
Compensatory Effect:
If the weight is not up to standard in the first week, the resulting growth lag is difficult to fully compensate for later. Studies have shown that a 1-gram difference in weight at the end of the first week can result in a 10-15-gram difference at slaughter.
Mid-Stage (4-6 Weeks Old):
Skeletal Development with Balanced Growth.
Entering the mid-stage, the skeletal system of broilers enters a rapid development phase. The focus at this time is no longer on maximizing absolute weight gain, but rather on ensuring a strong and robust skeleton.
Weight Control:
Modern broiler breeds have enormous growth potential at this stage, but uncontrolled, rapid weight gain can put immense stress on the cardiovascular system and legs, increasing the risk of ascites, sudden death syndrome, and leg problems.
Scientific Management:
Therefore, appropriate feed restriction (such as controlling feed intake or adjusting feed nutrient levels) is typically implemented during this stage to allow for steady weight gain within the standard range, ensuring healthy development of the skeleton and internal organs. For broiler breeders, weight control at this stage is even more crucial for future reproductive performance.
Fattening Period (6 weeks to slaughter):
A Sprint to Increase Weight and Maximize Efficiency.
This is the period of fastest growth and highest feed conversion efficiency in a broiler's life.
Rapid Weight Gain:
The strong foundation laid in the earlier stages will be fully realized in this final phase. The broiler's weight will increase rapidly; for example, from about 40 grams at hatching, it can weigh over 2.5 kg at 56 days old.
Nutritional Strategy Adjustment:
To support this explosive growth, the diet needs to be adjusted from a "skeletal diet" to a "fattening diet."This is usually achieved by adding oils and other substances to increase the feed's energy level, allowing the broiler to efficiently convert nutrients into muscle and an appropriate amount of fat, achieving optimal slaughter weight and meat quality.
The weight standards vary greatly between different breeds (such as fast-growing white-feathered broilers and slow-growing brown-feathered broilers). Which breed do you primarily raise? Or do you have specific weight data (such as weight at a certain age) so I can help you determine if it meets the standards.
