Use of computer simulation to teach a systems approach to metabolism

• Published in: Journal of animal science Vol. 86; no. 2; pp. 483 - 499
• Main Authors: Johnson, H.A, Maas, J.A, Calvert, C.C, Baldwin, R.L
• Format: Journal Article
• Language: English
• Published: Savoy, IL American Society of Animal Science 01.02.2008; Am Soc Animal Sci; Oxford University Press
• Subjects: amino acids; Animal Nutrition Sciences - education; Animal Nutritional Physiological Phenomena - physiology; Animal productions; Animals; Biological and medical sciences; Cattle; Cattle - metabolism; Cattle - physiology; Computer Simulation; computer software; cow feeding; dairy cows; dietary protein; dietary supplements; Education, Veterinary; educational methods; endocrine system physiology; Energy Metabolism - physiology; Female; Fundamental and applied biological sciences. Psychology; Humans; information systems; Instructional design; lactation; Lactation - metabolism; Metabolism; milk synthesis; milk yield; nitrogen metabolism; nutrient requirements; nutrient-nutrient interactions; Nutrition; Science education; simulation models; somatotropin; Teaching - methods; Terrestrial animal productions; university programs; user interface; Vertebrates; Farming animal; dairy cow; Nutrition; Computer simulation; Dairy cattle; classroom; Metabolism; Vertebrata; Mammalia; Artiodactyla; Simulation model; Ungulata; computer simulation model
• ISSN: 0021-8812; 1525-3163
• DOI: 10.2527/jas.2007-0393

Use of a systems approach, as embodied in the computer simulation model of metabolism of a dairy cow, Molly (Baldwin, 2005), is ideal for teaching nutrition. This approach allows the overall complexity of the comprehensive system to be broken down into smaller manageable subunits that are easier to visualize. Quantitative interactions among nutrients supplied and metabolic production processes can be observed over extended time periods. Using Molly, undergraduate animal science students are able to observe detailed effects of changing dietary inputs, altering genetic milk production potential, and exogenously manipulating metabolism on metabolism of the whole cow. This paper demonstrates how Molly is used in the classroom to teach a systems approach to nutrition using example simulations. Three simulation examples demonstrate exercises examining effects of recombinant bovine somatotropin administration, dietary protein, and amino acid supplementation and nitrogen efficiency on milk production and cow metabolism. These and similar examples have been used to teach nutrition, metabolism, and lactation to undergraduate students for the past 20 yr.