This episode was recorded in Fort Wayne, Indiana, during the 2025 Tri-State Dairy Conference.

Dr. Boerman notes we know cows experience a negative metabolizable protein balance in early lactation, which means they’re mobilizing skeletal muscle to make up for that. Dr. Boerman and her group have been interested in strategies to measure how much muscle they’re mobilizing, when they’re losing it and when they gain it back. (3:51)

Cows are ultrasounded during the dry period to determine longissimus dorsi muscle reserves, then divided into low vs high muscle groups. Weekly ultrasounds follow them through lactation. Animals with high muscle reserves during the dry period mobilized muscle before calving, which resulted in increased calf birth weights. Animals with less muscle during the dry period can gain muscle during that time and have more muscle reserves at calving than they had in the middle of the dry period. Dr. Boerman discusses possible nutrition interventions to manage muscle depletion and accretion, as well as timing of muscle loss and gain. (5:14)

The panel discusses how cows were assigned to high- and low-muscle groups and how representative those groups might be to the general population of dairy cows. Dr. Boerman mentions they’ve recently started evaluating primiparous cows as well to see if they perform differently than multiparous cows. (10:33)

Dr. Boerman notes that cows are mobilizing between 30 and 35% of their longissimus dorsi depth during lactation and muscle biopsies have shown a reduction in muscle fiber size. They also measure 3-methyl histidine and creatinine as biomarkers of muscle loss and gain. The panel discusses increased calf birth weights and impacts on colostrum for high-muscle groups. Body condition score is not a good predictor of muscle depth. (16:52)

The group discusses how parity might impact protein loss and gain, the influence of genetics on these muscle measurements, how health events might affect muscle mobilization and what kind of hormonal regulation might be occurring to control muscle losses and gains. (23:41)

Dr. Weiss shares about a project from his group where muscle and fat losses were measured by dilution. They fed 20% protein diets using soy alone or with supplementation of rumen-protected amino acids. He emphasized the differences between heifers and cows, similar to what Dr. Boerman’s group has observed as well. (29:54)

Dr. Boerman shares some ideas of what kind of experiments she’d like to conduct next to continue this line of research. (33:42)

Panelists share their take-home thoughts. (35:29)

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Balchem’s Bourbon & Brainiacs event took place at the Frazier History Museum during the 2025 ADSA annual meetings in Louisville, Kentucky.

After introductions, Dr. Lucy shares about the ADSA monthly podcast, Dairy Digressions, which he hosts. He discusses listener demographics, the diverse paths to becoming a dairy scientist and inspiring young people to pursue a career in dairy science. The panel goes on to discuss the camaraderie and friendships developed and nurtured at ADSA meetings. (2:44)

Dr. Kononoff asks the panel their thoughts on how to protect students, given the current and potential future funding concerns for science. Dr. Lucy notes he believes science will prevail. Dr. St-Pierre comments we have portrayed science as infallible, when it’s really self-correcting, and the machine of a university is faculty and students. Dr. Kononoff, originally from Canada, discusses the uniqueness of the land-grant system in the US. (8:31)

Dr. Lucy shares some of his favorite parts of being an ADSA member. (17:44)

Dr. Williamson, a neuroscientist, suggests the dairy industry could learn from human behaviorists regarding marketing their products. Dr. Ordway agrees, as someone who did not grow up in the agriculture industry. (20:42)

Dr. St-Pierre talks about presenting at his very first ADSA meeting when he was still learning to speak English. He goes on to discuss how meetings and students have evolved over the years. (23:03)

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This episode was recorded in Fort Wayne, Indiana, during the 2025 Tri-State Dairy Conference.

Dr. Carpenter gives an overview of her presentation. She summarizes an Extension risk management project regarding heifer development, assisting dairies in benchmarking their heifer growth and development. Key focus points include reducing morbidity and mortality and timely breeding to achieve goals for age at first calving. Dr. Carpenter also emphasized heat detection and conception, as well as recordkeeping as important considerations for success. (4:10)

Dr. Carpenter shares findings from a beef-on-dairy feeding experiment where any calf that had two or more lifetime respiratory events had lower carcass weight and lower return on investment. The panel discusses industry uptake of using lung ultrasounds to evaluate respiratory events. (11:53)

Guests talk about different feeding concepts in heifer development and trends in age at first calving over time. (14:31)

The panel dives into home-raising versus custom-developing heifers. Dr. Carpenter notes Penn State has great resources regarding custom rearing of dairy heifers. Pros and cons of both systems are discussed, and the panel also touches on rearing of beef-on-dairy calves as well. (19:17)

The group returns to the topic of age at first calving. Reducing variation at age at breeding is important, and producers should consult with their nutritionists and veterinarians for a team approach to success. (24:44)

Dr. Carpenter and Dr. Tebbe talk about how producers are dealing with replacement heifer shortages. (27:24)

Panelists share their take-home thoughts. (31:48)

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