The latest Galaxis™ Frontier research out of the University of Wisconsin-Madison suggests that the benefits of rumen-native microbes may reach far beyond digestion. In a study led by Dr. Jimena Laporta (Tabor & Guadagnin et al., 2025 JDS), researchers explored how native rumen microbes influence whole-animal physiology, including the mammary gland, colostrum and milk composition, and energy metabolism. The transition from the dry period to lactation is one of the most metabolically demanding times in a dairy cow’s life.
Her body must rapidly shift gears, mobilizing energy from body reserves to support milk production while minimizing the risk for metabolic diseases like ketosis or milk fever. Ensuring that her rumen microbiome is performing optimally during this window is critical for supporting metabolic balance, immune function, and a strong start to lactation. Earlier research showed that providing cows with Galaxis Frontier starting in the close-up period increased colostrum (Logan Real, 2022) and milk production during early lactation (Bulnes et al., 2024). This new study builds on those findings and helps explain why.
The UW-Madison team found that rumen-native microbes didn’t just affect rumen function, they also appeared to support mammary gland development and colostrogenesis, revealing a potential mechanism behind the previously observed production gains. Researchers evaluated Galaxis Frontier in 60 pregnant multiparous Holstein cows that were blocked by parity and assigned to one of three groups: a control group that received no intervention, a group that received Galaxis Frontier both before and after calving (from 4 weeks prepartum to 100 days in milk), and a group that began receiving it on day one after calving. They tracked changes in body weight and condition, milk production, and blood energy markers throughout the transition period and early lactation. Colostrum and weekly milk samples were collected, and biopsies of mammary tissue were performed at 2 and 8 weeks after calving to track structural changes in early lactation and composition of the fluid.
Overall, here’s what the research found in cows receiving Galaxis Frontier: The mammary gland was more developed. Treated cows tended to have more milk-producing cells and more alveoli, the tiny cells and structures that make milk, and this was especially visible around peak production. This suggests Galaxis Frontier helped maintain udder development and capacity beyond the immediate post-partum period. Importantly, this response was seen both in cows that started on Galaxis Frontier prepartum and those that started on Galaxis Frontier on day one after calving.