Researchers tested whether adding two special supplements to chicken feed could help birds grow well even when the feed had less phosphorus than normal. They fed 400 young chickens different diets over six weeks and measured how much they grew, how efficiently they used their food, and checked their digestive health. The results showed that combining both supplements together worked best for helping chickens gain weight quickly in their first two weeks, and using both supplements with low-phosphorus feed helped them grow well throughout their entire lives. These findings suggest that these additives could help farms reduce phosphorus use while keeping chickens healthy and productive.
The Quick Take
- What they studied: Whether adding two special ingredients (phytase enzyme and acidifier) to chicken feed could help young chickens grow well even when the feed contained less phosphorus than usual.
- Who participated: 400 one-day-old male broiler chickens (Ross 308 breed) divided into 5 groups with different feed recipes. Each group had 80 chickens split into 4 smaller groups of 20 birds each.
- Key finding: Chickens that received both supplements together grew significantly faster in their first 10 days compared to other groups. When both supplements were added to low-phosphorus feed, chickens maintained excellent growth throughout their entire 6-week life, growing as well as or better than chickens on regular feed.
- What it means for you: This research suggests that farms might be able to reduce phosphorus in chicken feed without slowing growth, which could be better for the environment. However, this study was done in controlled laboratory conditions with specific chicken breeds, so results may vary on actual farms.
The Research Details
Researchers divided 400 baby chickens into 5 equal groups and fed each group a different diet for 42 days (about 6 weeks). Group 1 received standard feed with no additives. Group 2 got standard feed plus phytase (an enzyme that helps chickens digest phosphorus better). Group 3 received standard feed plus an acidifier (a substance that makes feed slightly more acidic). Group 4 got standard feed with both phytase and acidifier. Group 5 received low-phosphorus feed with both phytase and acidifier. The researchers carefully measured how much each chicken weighed, how much food they ate, and how efficiently they converted food into body weight. They also examined the chickens’ intestines, livers, and the bacteria living in their digestive systems to understand how the supplements affected their health.
This research design is important because it tests whether additives can help chickens perform well on reduced-phosphorus diets. Phosphorus is an important nutrient, but excess phosphorus in chicken waste can pollute water sources. By testing whether chickens can thrive on lower-phosphorus feed with these supplements, the research could help farms reduce environmental pollution while maintaining chicken health and productivity.
This study was well-designed with a large sample size (400 chickens), multiple treatment groups for comparison, and careful measurement of many different outcomes. The researchers examined not just growth but also digestive health and organ development. However, the study was conducted in a controlled research setting, so results might differ on commercial farms with different conditions. The study was published in a peer-reviewed journal, which means other scientists reviewed the methods and findings before publication.
What the Results Show
Chickens receiving both phytase and acidifier together showed the strongest growth during the first 10 days of life, gaining more weight per day than other groups. When chickens received low-phosphorus feed combined with both supplements, they maintained excellent growth throughout the entire 6-week period, with overall weight gain matching or exceeding chickens on regular feed. The combination of both supplements also improved how efficiently chickens converted their food into body weight—meaning they needed less feed to gain the same amount of weight. This efficiency improvement was most noticeable in the early growth phase (first 10 days) and continued through the middle growth phase (days 11-24).
Chickens fed only the acidifier had larger intestines relative to their body size and taller intestinal finger-like structures (called villi) that help absorb nutrients. Chickens on low-phosphorus feed with both supplements showed deeper intestinal pockets (called crypts), which may indicate active intestinal development. Importantly, the supplements did not harm the chickens’ livers or change the bacteria living in their digestive systems in negative ways. The bone quality and strength of chickens’ leg bones remained normal across all groups.
Previous research has shown that phytase enzymes can help chickens digest plant-based phosphorus better, and acidifiers can improve nutrient absorption. This study builds on that knowledge by showing that combining both supplements works better than using either one alone, especially when phosphorus levels are reduced. The findings align with the growing body of evidence that strategic feed additives can help farms reduce nutrient pollution without sacrificing animal performance.
This study was conducted in a controlled research facility with specific chicken breeds and carefully controlled conditions. Results may differ on commercial farms where conditions are less controlled. The study lasted only 6 weeks, so long-term effects are unknown. The research focused on one specific dose of each supplement (2000 FTU/kg phytase and 3 g/kg acidifier), so different doses might produce different results. Additionally, the study measured intestinal structure but didn’t fully evaluate how well chickens actually absorbed nutrients.
The Bottom Line
Based on this research, farms may consider using phytase and acidifier supplements together when reducing phosphorus in chicken feed. The evidence suggests this combination can maintain chicken growth and health while potentially reducing environmental impact. However, farms should start with small-scale trials before making large changes, as results may vary based on local conditions, feed ingredients, and chicken breeds. Confidence level: Moderate—this is solid research, but it was done in controlled conditions and should be validated on actual farms.
Poultry farmers and feed manufacturers should pay attention to these findings, especially those interested in sustainable farming or reducing environmental pollution. Environmental agencies concerned about phosphorus runoff from farms may find this research relevant. However, this research is specific to broiler chickens and may not apply to other poultry types or other animals. Home chicken keepers with small flocks may not benefit from these specialized additives.
Growth improvements appeared within the first 10 days of supplementation. Full benefits for overall growth were visible by the end of the 6-week study period. Farms implementing these changes should expect to see results within 2-3 weeks of starting supplementation.
Want to Apply This Research?
- If managing a poultry operation, track daily weight gain and feed conversion ratio (amount of feed needed per pound of weight gained) weekly. Compare these metrics between flocks fed with and without the supplement combination to measure real-world effectiveness.
- For farmers: Test the phytase and acidifier combination on a small portion of your flock first (10-20% of birds) while maintaining detailed records of feed costs, growth rates, and final body weights. Gradually expand use if results match research findings.
- Monitor bird health visually (activity level, feather quality, absence of disease signs) throughout the feeding period. Track feed consumption daily and weigh representative birds weekly. After 6 weeks, compare final weights and feed efficiency to your baseline data from previous flocks on standard feed.
This research was conducted on broiler chickens in controlled laboratory conditions and may not reflect results on commercial farms or with different chicken breeds. The study does not constitute veterinary advice. Farmers considering changes to feed formulations should consult with a veterinarian or poultry nutritionist before implementation. Results may vary based on local feed ingredients, water quality, climate conditions, and management practices. This research is intended for educational purposes and should not replace professional agricultural or veterinary guidance.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.