On this spring episode of The Moos Room, Brad dives into the seasonal return of flies and shares results from a recent horn fly vaccine study conducted at the University of Minnesota’s WCROC. Horn flies—common in pasture-based systems—cause significant irritation, blood loss, and production losses in cattle, and their rapid life cycle makes them difficult to control, especially with increasing insecticide resistance.

The study evaluated a Medgene horn fly vaccine designed to disrupt the fly’s ability to take a blood meal, ultimately reducing reproduction. Researchers vaccinated about half of the cows and heifers across organic (pasture-based) and conventional (dry lot) systems and tracked fly populations throughout the summer. While no differences were observed for face flies or stable flies—as expected—the vaccine showed promising results for horn flies. There was little effect in conventional cows, but in pasture-based animals, especially heifers, vaccinated groups experienced a consistent 30–40% reduction in horn fly numbers compared to controls.

Overall, the findings suggest that horn fly vaccination could be a valuable new tool—particularly for grazing and organic dairy systems—to help manage fly pressure and improve animal well-being over time.

Questions, comments, scathing rebuttals? -> themoosroom@umn.edu or call 612-624-3610 and leave us a message!

Linkedin -> The Moos Room
Twitter -> @UMNmoosroom and @UMNFarmSafety
Facebook -> @UMNDairy
YouTube -> UMN Beef and Dairy and UMN Farm Safety and Health
Instagram -> @UMNWCROCDairy
Extension Website
AgriAmerica Podcast Directory

Brad shares a spring dairy update and breaks down newly released national performance metrics from the Council on Dairy Cattle Breeding, offering a snapshot of what the U.S. dairy herd looks like today. He also touches on a major industry headline—Zoetis’ planned acquisition of Neogen’s animal genomics business—and what that could mean for dairy genetics going forward.

A big part of the episode focuses on the red-hot calf market, especially for beef-on-dairy crosses. Brad highlights eye-popping prices from Minnesota sale barns, where Holstein bull calves and beef-cross calves are bringing in far more than producers would have expected just a few years ago. He reflects on how dramatically the economics of beef-on-dairy have changed and what that could mean for breeding decisions on dairies this year.

The second half of the episode dives into the new national herd data, including milk production, components, somatic cell counts, herd size, and breed distribution across the country. Brad walks through where Holsteins, Jerseys, crossbreds, Brown Swiss, Guernseys, Ayrshires, and Milking Shorthorns stand today, and which states are leading in cow numbers and herd size. It’s a practical, numbers-driven look at dairy trends in the U.S. and a useful update for anyone interested in genetics, herd demographics, and where the industry is heading.

Questions, comments, scathing rebuttals? -> themoosroom@umn.edu or call 612-624-3610 and leave us a message!

Linkedin -> The Moos Room
Twitter -> @UMNmoosroom and @UMNFarmSafety
Facebook -> @UMNDairy
YouTube -> UMN Beef and Dairy and UMN Farm Safety and Health
Instagram -> @UMNWCROCDairy
Extension Website
AgriAmerica Podcast Directory

Brad explores a recent study comparing two common calf-feeding methods: open buckets and nipple buckets. While most U.S. dairies rely on open buckets because they allow calves to drink quickly and reduce chore time, the research looked at how these systems affect calf growth, digestion, and behavior.

The study followed individually housed calves fed six liters of milk per day until weaning at eight weeks. Calves fed with open buckets finished their milk much faster, often in under two minutes, while nipple-fed calves took about five minutes because the system mimics natural suckling. Despite the difference in drinking speed, both groups had similar growth rates and physical development.

However, behavior and digestion told a more interesting story. Calves fed with open buckets consumed more starter grain and spent more time ruminating, but they also showed more non-nutritive oral behaviors like sucking on pen fixtures or other calves—likely because their natural suckling drive wasn’t satisfied. Nipple-fed calves showed fewer of these behaviors, had slightly firmer feces, and exhibited metabolic signals suggesting improved digestion.

Brad breaks down the trade-offs for dairy producers: open buckets offer efficiency and faster feeding, while nipple buckets may better support calf welfare and natural behavior. The episode highlights how feeding systems can influence calf behavior, digestion, and management decisions on dairy farms.

Questions, comments, scathing rebuttals? -> themoosroom@umn.edu or call 612-624-3610 and leave us a message!

Linkedin -> The Moos Room
Twitter -> @UMNmoosroom and @UMNFarmSafety
Facebook -> @UMNDairy
YouTube -> UMN Beef and Dairy and UMN Farm Safety and Health
Instagram -> @UMNWCROCDairy
Extension Website
AgriAmerica Podcast Directory