ISSUE FOCUS 30 FEED & ADDITIVE MAGAZINE February 2023 About Aurelien Piron Aurelien Piron is working for Lallemand Animal Nutrition for 12 years as ruminant technical manager. Aurelien is in charge of technical support for ruminants feed additives range (deployment of on farm services, training for field salesmen, joined RandD program and field experiences with customers). He is also involved in several marketing, technical and RandD projects within Lallemand. After a master of science in Animal Production performed in University of Angers (France), he worked during 2,5 years in a premix company as technical and applied RandD manager. As his parents are dairy and beef producers in a typical French family farm, Aurelien spends a lot of time on dairy and beef farms. of forage and on its own degradability (Guedes et al., 2008; Guedes et al., 2015; Chaucheyras-Durand et al, 2010, Ding et al, 2014). Research studies have evaluated the possibility to model the effect of S. cerevisiae CNCM I-1077 on dynamic model. It clearly demonstrates that the effect of a rumen modifier based on its mode of action, can be integrated into a nutritional software and accurately predict the effect on animal performance. Overall, combined data trials indicate a 3% improvement of feed efficiency with the live yeast supplementation, with higher effect under rumen challenged conditions (up to 7% increased feed efficiency, corresponding to a 6:1 up to 9:1 return on investment for the producer under these challenging situations (figure 4). CONCLUSION Fiber represents the majority of milk energy for dairy cows. Fiber degradability is linked: • to the quality of the plant material, which depends on both the crop inherent characteristics and its growing environment, and • to the fiber digestion process once it is fed to the animal (mainly located in the rumen). So, the degradation of fiber is influenced by farming practices and rumen dynamics. Indeed, the rumen can be pictured as an engine that, thanks to its unique microbiome, turns fibers into milk energy. Management and feeding practices that ensure optimal rumen environment (pH, microbial balance…) and function can help improve the efficiency of the ‘rumen engine’ for optimal farm revenue. Figure 4. Live yeast effects of dairy cow feed efficiency (average of several trials).
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