The Impact of Nutrient Distribution on Broiler Performance: A Study by Penn State University
Broiler chickens, which are raised in large houses through long distribution lines, can experience variations in feed quality, which in turn affects their growth and health. A recent study conducted by researchers at Penn State University in the United States delves into the effects of nutrient distribution on broiler chicken performance, processing yields, and bone mineralization.
Field Observations and Key Findings
During their observations, researchers noted a significant difference in feed quality across different sections of the poultry house. Jon Boney, a Fellow of Poultry Nutrition at the College of Agricultural Sciences, observed that the front of the house, where feed is initially distributed, had a higher quality compared to the back end. This led to the crucial question: How does this physical quality variation impact the nutrition the birds receive?
The study's findings, published in the December issue of the Journal of Applied Poultry Research, revealed that variations in two key nutrients along the feed line significantly impact broiler chicken growth performance. These nutrients are:
- Amino Acid Density: This refers to the amount of essential amino acids, the building blocks of proteins, in the feed. The research found that diets with higher amino acid density led to better growth outcomes.
- Phytase Activity: This is an enzyme that helps chickens absorb phosphorus from plant material. Interestingly, the study found that phytase activity levels did not significantly impact growth, feed efficiency, or bone health.
Methods and Results
The researchers conducted a controlled experiment by feeding young commercial broiler chickens different diets with varying levels of amino acid density and phytase activity. The enzyme phytase was carefully removed at the feed mill and added later to ensure precise dosing.
The results were striking. Birds fed diets with higher amino acid density gained more body weight, exhibited better feed efficiency, and produced higher breast meat yields. Conversely, the phytase activity levels did not have a significant impact on growth or bone health.
Practical Applications for Producers
The study's findings have important implications for poultry producers. According to Boney, monitoring amino acid density is more effective than monitoring phytase activity in assessing feed-quality consistency in large poultry houses. The length of the feed line and the quality of the feed pellets can lead to nutrient inconsistencies, affecting the growth and health of broiler chickens.
Boney emphasizes the importance of consistent feeding methods in the growing poultry industry. By minimizing nutrient segregation, producers can ensure that all birds have access to the same nutrients, leading to more uniform growth rates and healthier flocks. This, in turn, helps processing plants meet orders more efficiently.
Funding and Conclusion
The research was funded by the PA Poultry Research Checkoff program and the US Department of Agriculture's National Institute of Food and Agriculture. The study highlights the critical role of nutrient distribution in broiler chicken performance, offering valuable insights for producers to optimize feeding practices and improve overall flock health.
