Brian A. Crooker

Professor-Ruminant Nutritional Physiology
105B Haecker Hall
1364 Eckles Avenue
St. Paul, MN 55108-6118
+1 612 625 3185


  • Postdoctorate, Cornell University - Nutritional Physiology
  • Ph.D., University of Illinois - Dairy Nutrition
  • M.S., University of Maine - Animal Nutrition
  • B.S., University of Maine - Biochemistry

Research Interests

Regulation of nutrient use by food producing animals with a focus on lactation. Studies are designed to determine physiological, metabolic, and genetic factors that regulate and affect performance and efficiency of lactation. Effects of selective breeding, metabolic modifiers, and dietary modifications on lactational performance, body composition, endocrine profiles, and gene expression are determined. Holstein cows from a breeding project designed to produce superior (high producing, efficient) and inferior (low producing, less efficient) cows, which currently differ in milk yield per lactation by more than 4,000 kg, and contemporary cows are used in these studies. Current efforts with these cows and their calves are focused on the somatotropic axis (GH, IGF-I, and IGFBPs). We are also evaluating methods to successfully induce cows to lactate, that is to produce milk without calving.


  • ANSC 1011: Domestic Animals & Society (guest lecturer)
  • ANSC 4096: Professional Internship
  • BTHX 5000/8000: Animal Ethics (guest lecturer)
  • ANSC/CMB/VMED 8134 - Ethical Conduct of Animal Research (course coordinator)
  • ANSC 8211: Animal Growth & Development (guest lecturer)


  • Developed program addressing safety, use, and economics of bovine somatotropin.
  • Participate in efforts to address issues in animal welfare, biotechnology, and ethics.

Honors & Awards

  • National Milk Producers (R. M. Hoyt Memorial) Award for Outstanding Graduate Student in Dairy Science, 1985
Dr. Brian Crooker