Efficient broiler production without antibiotic growth promoters

The research study carried out at Southern Poultry Research in Georgia, USA has compared the effect of HP AviStart with
bacitracin methylene disalicylate (BMD), a commonly used and well-researched antibiotic growth promoter (AGP).
AGPs have long been used in broiler feeds due to their ability to improve body weight gain and lower feed conversion ratios,
leading to more efficient production. Changing consumer preferences, however, have created a need to eliminate antibiotics
from many diets, resulting in loss of performance.

HAMLET PROTEIN developed HP AviStart to maintain broiler performance in AGP-free diets. Key considerations when
formulating AGP-free diets are the digestibility of the feed and elimination of dietary anti-nutritional factors. Due to the
immature digestive tract of broilers at hatching, there is a risk that many nutrients will pass through the digestive tract without
being absorbed. This not only decreases performance and efficiency but can also cause poor gut health due to harmful bacteria
that feed on these undigested nutrients in the hind gut.

HP AviStart is a highly digestible soy protein produced by the enzymatic co-processing of soybean meal and yeast. This
reduces the anti-nutritional factors in soybean meal, resulting in an easily digested protein source that allows broilers to reach their potential for healthy growth.

Facts on the feeding trial

  • 1,800 Cobb 500 broilers
  • Duration of 42 days with 12 replicates per treatment (50 birds/pen)
  • Broilers were fed three different diets: control, feed with 5% HP AviStart, and feed with BMD at 50 grams/ton. The diets are listed in Table 1
  • Starter diets were fed in crumble form (day 0-14). Grower (day 14-35) and finisher (day 35-42) diets were fed in pelleted form.
  • HP AviStart was included in the starter feed only (day 0-14) while BMD was used throughout the growing cycle (day 0-42)
  • No anticoccidials or ionophores were used in the feed. All chicks were spray vaccinated with a commercial coccidia vaccine at the recommended level prior to placement

HP AviStart performs as well as BMD

Results show that the inclusion of 5% HP AviStart in the starter feed alone equals the performance of BMD when added at 50 g/ton during the entire growing cycle. This makes HP AviStart an excellent choice for maintaining growth and feed efficiency with AGP-free diets.

4,3 point improvement in feed conversion rate and 53g increase in body weight at 42 days

In addition to equaling the performance of BMD, a broiler starter feed with 5% HP AviStart resulted in 53g extra body weight gain and reduced FCR by 4,3 points at 42 days of age compared to the control diet.

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Product benefits

Right after hatching, chicks rely on their yolk sac while they learn to scratch for food. When their starter feed contains HP AviStart, they can digest essential nutrients from day 1.


Feed you brain

We often publish articles on young animal nutrition topics in international journals and magazines. Browse the Feed Your Brain article archive to read our own and other relevant articles from these publications.



Providing the right nutrition in the first life stage determines the overall lifetime performance of the animal. Our soy-based specialty ingredients improve health, welfare and performance of young animals. That is how we deliver a strong return on investment to producers around the world.