ISSUE FOCUS 22 FEED & ADDITIVE MAGAZINE September 2023 Milk production was more stable for cows fed with Valopro NRJ during the trial so persistancy is improved with Valopro NRJ. At the end of the trial, milk composition was similar between the two groups (+1.7 g protein/kg and +1.8 g protein/kg for Valopro NRJ and Control groups respectively and +1.1 g fat/kg for both Valopro NRJ and Control groups) so that energy corrected milk was improved. There was no difference between groups for milk urea, intake and body weight. CONCLUSION Results indicates that 30 g/cow/d of Valopro NRJ can significantly improve milk yield and ECM and is a suitable solution to increase profitability in dairy cows system. There is a significant economic advantage to monitor feed efficiency. It allows farmers to regularly adjust the nutrition of the herd in order to maximize income from milk production regarding feed price of the moment. The use of single or blend of phytogenics can be part of the global approach to increase feed efficiency. The implementation of this kind of products can be performed in two different ways: in top feeding or in diet optimization, to increase performance or decrease the feed cost of diets without degrading animal performance. A lower diet cost thanks to optimization is very interesting especially in contexts of low milk prices and high raw materials cost. Diet optimization with Valopro solutions also makes it possible to limit the environmental impact of the feed or diet by selecting more local raw materials or by-products with a lower environmental impact. miXscience has developed the MatriCiel tool to calculate the environmental impact of feed according to various criteria, including a Climate Change Impact Criterion in CO2 equivalent. These calculations depend on the context (area and period). References are available upon request. Product not available in all countries, local regulations should be consulted. Intended only for the export outside the European Union. Figure 1. Energy Corrected Milk evolution during the trial (kg/cow/d *p-value = 0.015
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