Supporting feed conversion during heat stress

Dr. Connor Padgett, PhD, Poultry Technical Sales Manager

With the temperatures rising in most regions, concern for heat stress events in Poultry barns is also on the rise.   Heat stress can have a negative impact on several aspects of a chicken’s well-being; one consequence that can significantly impact poultry production and profitability is feed efficiency.  With chickens starting to feel the physical impact of heat stress as early as April and May in some regions, solutions are needed to assist their physiological defenses.

Nutritional supplements are available to address heat stress in broilers. Particularly, feed supplementation with yeast cell wall compounds such as mannan-oligosaccharide and 1,3/1,6 β-glucans has been shown to modulate immunity, preserve gut function and improve growth performance. This scientific knowledge is the foundation of Safmannan, a selected yeast fraction rich in mannan-oligosaccharides and β-glucans.

Trial 1:


450, 1-day-old male broilers on a corn-soybean diet, were randomly assigned to 3 different groups for this 42-day floor pend trial where heat stress conditions were 95 ± 3.6°F for the first week and then decrease of 5.4°F per week until it reached 78.8 ± 3.6°F. SafMannan was supplemented at 1lb/T.

Sohail et. Al 2012

safmannan FCR

Trial 2:


300, 1-day-old male broilers were randomly assigned to 3 different groups of 100 (10 pens of 10 birds each). Group 1 (negative control; No heat stress and no supplementation). Group 2 (positive control; heat stress, no supplementation). Group 3, heat stress; supplemented with Safmannan at 0.5lbs/T. After 42 days, feed conversion was evaluated.

safmannan FCR2

Trial 3:


60 Day commercial grow-out field trial, Southeast Integrator


During a 60-day target grow-out period, this on/off trial alternated supplementation with Safmannan in two-week time periods. Safmannan was supplemented at 1 lb/T in the finisher diets during the weeks specified below.


Two week periods of Control vs SafMannan in Finisher Diets

Wk ending 7/20 – Control

Wk ending 8/3 – SafMannan

Wk ending 8/17 – Control

Wk ending 8/31 – SafMannan

Wk ending 9/14 – Control

safmannan FCR3

It is widely known that heat stress can have detrimental effects on broiler performance and overall bird health. Therefore, a multi-faceted approach is necessary in most situations to help mitigate the negative effects of heat stress. In order to effectively mitigate these effects, a multi-hurdle approach which includes proper management, program monitoring, and effective tools such Safmannan are necessary. Safmannan is a premium, sustainable, nature-based solution that has been specifically selected and scientifically validated to improve natural defenses and intestinal mucosal integrity.



In instances of heat stress, Safmannan serves as a biological approach to those physiological problems induced by heat stress. This supplement helps to mitigate these negative zootechnical performance effects, resulting in improved feed conversion in broilers across multiple growth targets. Overall, this results in improved performance, bird health and animal welfare.

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