yeast, has shown promising results when used as part of a rounded nutri- tional strategy.
Studies carried out with the yeast probiotic, Actisaf Sc47, have shown significant improvements in rumen function. Moallem et al. (2009) recorded a rise in dry matter intake and milk yield, for example, when the product was fed to cows facing a heat stress challenge. These results could be explained by important changes in blood parameters, like glucose. This is a major source of energy in cows, being used by the mammary gland to produce lactose. Increased blood glucose in heat-stressed cows might not only explain an increase in milk production in trial animals but also the development of better all-round health due to more metabolic energy being made available for their basic maintenance requirements.
Poultry Heat stress is also a major issue for the poultry industry, especially in relation to maintaining the performance of high- growth broilers. Over the past decades, genetic selection has enabled the poultry sector to achieve heavier broilers at the slaughterhouse (2.8 kg at 42 days in 2013 vs. 1.7 kg in 1960). Birds have been selected for their capacity to grow and higher feed intake. However, the impact heat stress has on the birds is also related to their weight. The more heavier the birds, the more negative impact heat stress will have on them. It’s widely recognised, in fact, that heat stress can have a det- rimental impact on broilers’ gut integrity, reducing their natu- ral capacity to address inflammatory processes caused by pathogens such as Clostridium and E. coli. Trials run in this context, using the selected yeast frac- tion, Safmannan, have shown the supplement to be helpful in improv- ing broilers’ natural defences and in- testinal integrity. Given to birds as a feed supplement, Safmannan has also been proven to help mitigate the negative zoot- echnical conse- quences of heat stress, resulting in
2
improved feed conversion, growth performance and survival (Figure 2). The product is therefore acknowledged as a posi- tive benefit to heat-stressed broilers, delivering improve- ments in their zootechnical performance, health and welfare.
Superior nutrition While the obvious commercial objective for livestock produc- ers is to raise animals for food, the best enterprises also en- sure their production systems are based on giving their cho- sen species essential care and respect. Unless farm animals are well-fed and healthy, and maintained in conditions which allow them to be settled and content, the end result will nev- er be truly sustainable. Our part in this process at Phileo by Lesaffre, is to be constantly searching for ever-improving animal health and welfare solu- tions. We’re committed to pushing the boundaries of animal care, believing in the future advancement of animal health, driven by the development of superior nutritional products as a major contribution to livestock welfare and productivity. While societal demands concerning animal health, product quality and environmental integrity keep rising, so our ambi- tion to develop science-based solutions, equipped to deliver a positive impact on farm animals, will continue to intensify.
Yeast-based solutions have been proven to help alleviate the impact of heat stress in sows.
p < 0.05
▶ SUSTAINABILITY AND WELFARE | OCTOBER 2020 11
FCR
Mortality d35-42 (%)
PHOTO: SHUTTERSTOCK
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