NEWS 16 FEED & ADDITIVE MAGAZINE March 2024 Spring turnout creates many dietary challenges for dairy herds that can result in butterfat depression and fertility issues. However, negative effects can be reduced by balancing rumen function and energy supply, says Dr. Richard Kirkland, ruminant nutritionist for Volac Wilmar Feed Ingredients. “As cows transition from a controlled winter ration to grazed grass, the rumen has to adapt to the differing and more-variable forage source. The diet change alone can cause challenges to rumen function and milk production stability. Additionally, the low fibre and rapid fermentability of early, leafy grass growth can disturb the rumen's pH balance and cause the grass to pass through the digestive system too quickly, increasing the risk of acidosis,” says Dr. Kirkland. “While early grass growth is high in energy, variable spring grazing conditions make it harder for energy supply to be consistently maximised, with a drop in fertility and milk production key risks.” During early lactation, cows cannot eat enough to meet the high energy demands of milk production, leading to a negative energy balance. This means they rely on body fat stores to support the genetic drive for milk production, resulting in a loss of body condition. Research from the University of Nottingham indicates that for each 0.5-unit loss in condition during this period, conception rates can fall by around 10%. “Digestible fibre sources such as soya hulls, citrus and sugar beet pulp will help balance the starchy energy sources and aid rumen function and milk fat, though offer less of the rumen ‘tickle’ factor than higher-fibre forages. With lower energy concentration than cereals, the greater bulk of forage sources will limit the potential to deliver those vital additional megajoules,” explains Dr. Kirkland. Read more>> Digestible fiber sources and rumen-protected fat supplements support fertility In collaboration with international agri-food products life cycle assessment (LCA) specialists, Blonk Consultants and Phileo by Lesaffre conducted a best-in-class dairy farm LCA, including a critical review with industry experts. The results indicate a significant reduction in the carbon footprint (CO2eq per kg of FPCM) by up to 5% during the period of supplementation. According to the company's statement, benefits are not limited to GHG intensity; they also have a positive impact on land use, eutrophication, and more. Julie Duclos, Global Species Manager at Phileo, emphasises the significance of Actisaf® Sc 47, stating, "This yeast probiotic is a trailblazer; Actisaf Sc47 efficiency and positive impact on farm profitability have been widely proven. Showcasing environmental efficiency through a Life Cycle Assessment from cradle to farm gate, with a very robust process, clearly demonstrates its effect on milk production carbon footprint. Actisaf Sc47’s positive impact on feed efficiency, performance, and carbon footprint makes it a promising solution for dairy farmers dedicated to sustainable practices. Phileo remains steadfast in our commitment to fostering innovation and providing reliable information that supports the sustainable development of the agricultural industry." The company states that, as the first yeast probiotic to undergo such a comprehensive assessment, Actisaf® Sc 47 not only reduces the carbon footprint but also proves its efficacy in addressing broader environmental challenges in dairy farming. Read more>> Yeast probiotic supplement reduces milk's carbon footprint
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