The Moos Room™

This episode examines how heat stress affects water intake in dairy cows—and why farms must prepare their watering systems for increasingly hot weather.
A review of studies from 1985–2024 found that Holstein cows producing roughly 65–70 pounds of milk averaged about 24 gallons of water per day under thermoneutral conditions. During heat stress, intake increased by approximately 10 liters, or 2–3 gallons, per cow per day. Each one-unit increase in the temperature-humidity index was associated with another 1.5 liters of water intake. Although heat-stressed cows produce less milk, they drink more because the additional water supports evaporative cooling and body-temperature regulation.
Data from the University of Minnesota’s dairy herd revealed a more complicated picture. smaXtec sensors showed that cows averaged around 23 gallons per day, but estimated intake declined during summer. Possible reasons include warmer drinking water, pasture water access, competition at waterers, and changes in drinking behavior. Cows generally drank only four or five times per day, consuming roughly 14–20 liters at each visit. Peak drinking also shifted from midafternoon in winter to around 7 p.m. in summer, often after milking.
These patterns highlight the importance of examining when cows drink—not just daily totals. Farms should ensure adequate water flow, tank capacity, access, and cool water during peak-use periods. Sensor readings are most valuable when compared with each cow’s normal behavior and interpreted alongside weather, milk production, rumination, health events, and management changes.
The central message is that water intake can be a useful indicator of heat stress, but unexpected changes should prompt investigation rather than an automatic conclusion. As extreme heat becomes more common, dairy water systems must be designed for peak demand rather than historical averages.
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 preliminary results from a University of Minnesota study examining feed intake, methane emissions, and feeding behavior in Holstein and crossbred dairy heifers. Using precision feeders, methane-monitoring equipment, and activity sensors, the research team compared Holsteins with ProCROSS and GrazeCross heifers.
The early findings show that methane production generally increased with feed intake. Smaller GrazeCross heifers consumed less feed and produced less methane and carbon dioxide, while ProCROSS heifers had the highest feed intake. However, methane produced per unit of dry matter intake did not differ significantly among the breed groups.
Brad also discusses how often heifers visited the feed bunk, how much time they spent eating, and what sensor data revealed about rumination and activity. These preliminary results highlight how body size, breed, and feeding behavior may influence heifer management and environmental efficiency.
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 takes a closer look at heat stress in dairy calves and cows. This episode highlights several recent studies on how temperature-humidity index affects calf behavior, lying time, respiration rates, shade use, and growth performance.
Brad discusses research from the University of Guelph, The Ohio State University, and Mississippi State showing that heat-stressed calves spend less time lying down, stand more often, breathe harder, and may gain less weight when shade is not provided. He also reviews a Texas A&M study using precision livestock technology to monitor drinking behavior, rumen temperature, and heat stress responses in robotic milking herds.
The big takeaway: heat stress in calves deserves more attention. Simple strategies like shade cloth, better ventilation, and more thoughtful housing design may help improve calf comfort, growth, and long-term performance.

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

Back from the ADSA annual meeting in Milwaukee, Brad shares highlights from several calf-focused dairy studies. This episode covers new research on colostrum management for beef-on-dairy crossbred calves, including how feeding practices differ between retained dairy heifers, beef-on-dairy calves, and calves not kept on farm.
Brad also reviews a study comparing fixed-age weaning with starter-intake-based weaning in Holstein and Angus-Holstein calves, plus new work using ear tag sensors to track calf behavior, rumination, eating, and activity through 150 days of age. The episode wraps up with research from the University of Florida on colostrum yield, quality, and genetics, including how season, parity, calf sex, gestation length, and days dry can influence colostrum outcomes.
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 two studies He presented at the American Dairy Science Association annual meeting. First, he examines records from more than 150,000 lactations to compare genetic predictions for somatic cell score and clinical mastitis. The results suggest that PTA for somatic cell score is more useful for predicting and ranking cows by observed somatic cell count than PTA for mastitis.
He also discusses a study comparing Holstein and crossbred heifers for feed intake, methane emissions, rumination, and feeding behavior. Although methane produced per kilogram of feed was similar across breed groups, smaller crossbred heifers consumed four to five pounds less dry matter per day. The findings highlight how genetics, breed, sensors, and precision feeding data could help producers improve herd health and heifer management.

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