gut function and improve growth performance, powerful mechanisms that could reverse or compensate the physiological alterations induced by heat stress. Safmannan (hereafter called YP: yeast postbiotic) is a premi- um quality yeast postbiotic that comes from a primary culture of Saccharomyces cerevisiae and is high in MOS and ß-1,3/1,6-glucans content. In this context, a postbiotic entails selected fractions from specific inactivated yeast cells, and when given to the animals at adequate amounts can bring health benefits. YP, supplemented at 250 g/t or 500 g/t of feed, can counteract the negative effects caused by heat stress, which has been studied and extensively over the last decade across a wide range of production systems and conditions.
Feed intake up, survival rate increased Heat stress can negatively impact a range of zootechnical parameters, including feed intake. Trials in severe heat stress conditions (THI of 32) in China (2017) showed that the birds that were supplemented with the YP had a significantly higher feed intake (90 grams per day), compared to the control group (84 grams) (p < 0.05). An important parameter for poultry producers is feed conversion ratio (FCR), which has to be as low as possible to secure farm profitability. Heat stress can increase FCR. A number of trials showed that YP can significantly decrease FCR of birds under severe heat stress conditions (Figure 1). Heat stress can also cause death, something to be prevented at all times. In numerous trials, the bird survival rate has increased when YP was added to the diet of the birds (Figure 2).
ROI of up to 10:1 An integrated approach including housing, feeding regimes and nutritional strategies is needed to better anticipate and hence prevent losses when the heat stress index (THI) rises. Safmannan, is a powerful dietary solution that helps reduce
Figure 1 - Effect of yeast postbiotic Safmannan on FCR under severe heat stress (D0 – D42, THI ≥ 32).
Control 100%
91% 92% 93% 94% 95% 96% 97% 98% 99%
90%
Mexico, 2015 *p < 0.01
Mexico, 2016 *p < 0.01
China, 2017 *p < 0.05
Brazil, 2017 *p < 0.05
1.996 1.739 1.75 1.71* 1.676* 1.902* 1.51* Safmannan 100% 1.57
84% 87% 89% 91% 93% 95% 97% 99%
99% 98%*
heat stress related effects in poultry, increase animal welfare and prevent feed losses. Based on the trials shown in Figure 1 and 2, the ROI of this postbiotic comes to an average of 6.5:1, up to an ROI of 10:1 for some situations. This makes this yeast postbiotic an important component of a global integrated heat stress mitigation programme. Not only to reduce heat related stress in birds but also financial related stress for poultry producers
Figure 2 - Effect of yeast postbiotic Safmannan on bird survival under severe heat stress (THI ≥ 32).
Control Safmannan
94%* 91% 90% 91%
Middle East, 2012
D0 – D42
Mexico, 2016 D0 – D42 *p < 0.01
Brazil, 2017 D35 – D42 *p < 0.05
References are available on request
▶ HEAT STRESS | MAY 2021 17
% of control group
PHOTO: PHILEO BY LESAFFRE Survival (%)
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