Enhancing Broiler Performance with Mannanase: A Study Summary

A recent investigation has unveiled that mannanase, a specialized enzyme intended to decompose complex carbohydrates in soybean meal (SBM), can considerably improve broiler performance, especially in energy-restricted diets with moderate to high SBM levels.

The Role of Soybean Meal in Poultry Nutrition

Soybean meal is a prevalent protein source in poultry feed, but it contains indigestible compounds known as mannans. These compounds can adversely affect nutrient absorption and increase energy loss by triggering immune responses. Mannanase plays a crucial role in mitigating these issues by breaking down mannans, thereby decreasing gut viscosity and enhancing nutrient uptake.

Research Insights: Methodology and Findings

Researchers from China Agricultural University, alongside partner institutions, examined the interaction between varying SBM levels and mannanase within low-energy broiler diets. They conducted a controlled factorial experiment with Arbor Acres broilers, using three different SBM concentrations: 35.66%, 17.83%, and 8.92%. Each diet was supplemented with or without 100 mg/kg of mannanase, with a consistent 50 kcal/kg deficit in metabolizable energy.

Results of Mannanase Supplementation

The findings indicated that mannanase improved growth performance, particularly at SBM concentrations of 17.83% and 35.66%. Metrics such as body weight and feed conversion ratios saw significant enhancement, alongside more efficient energy utilization and superior nitrogen retention.

Gut Health Benefits

At the gut level, mannanase facilitated better protein and amino acid digestibility, lowered gut viscosity, promoted villus development, and fortified intestinal barrier function. Additionally, inflammatory markers diminished, suggesting an overall stable immune environment within the gut. The microbial analysis revealed a reduction in harmful bacteria like E. coli and a favorable shift towards beneficial microbial metabolic pathways.

Substrate Dependence

Notably, these advantages diminished when the SBM concentration decreased to 8.92%, indicating that the enzyme’s effectiveness relies significantly on the availability of its substrate (mannans).

Implications for Feed Producers

In summary, this study presents a pragmatic solution for feed producers and poultry integrators seeking to cut costs or energy inputs without compromising growth performance. By strategically incorporating mannanase into diets with moderate levels of SBM, producers can enhance feed efficiency, support avian health, and reduce the environmental impact of poultry production.