ISSUE FOCUS FEED & ADDITIVE MAGAZINE June 2023 35 shifting feeding times to the cooler parts of the day may also help, alongside spreading mealtimes over longer periods of the day than would be necessary in more normal THI conditions. YEAST-BASED SOLUTIONS The role of yeast-based solutions to combat the impact of heat stress on livestock health, welfare, and performance, has also been shown to have positive protective qualities, as assessed through several institution and on-farm studies. Program Heat Stress, for example, developed at Phileo by Lesaffre, focuses attention on the yeast probiotic Actisaf® Sc 47, the yeast postbiotic Safmannan ®, and the organic selenium enriched yeast Selsaf®, each of which have been shown to have a beneficial impact on protecting dairy cows and calves from the worst impacts of heat stress. Trials with Actisaf® Sc 47 (Moallem et al., 2009) , carried out during moderate-to-high heat stress (77>THI>83), recorded a 1.5kg/day increase in milk production and a 600g/day increase in dry matter feed intake for treated cows compared to control milkers. Actisaf® Sc 47, combined with Safmannan®, has also delivered a strong immune response in dairy cows during heat stress, in contrast to the downgrading of immune functions which typically appear under such conditions. The successful reducMilk yield kg/day 43 37 31 25 +4.1% 36,3 37,8 ROI 10:1 Control Actisaf Graphic 1. Actisaf increases Milk yield under heat stress
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