On our campus in Moscow, ID, we have several fistulated cows used for research. The cannula (or "window") in the cows allows for access to the stomach contents for various analysis and research. These cows are visible in their pasture on the west side of campus and are one of our easily recognizable research projects. We have reproduced our Real Life fistulated cows in our Virtual Campus.
Several researchers at the University of Idaho are using the fistulated cows for research. One of these researchers is Mark McGuire, Ph.D PAS. He has used the cows for studies of lipid and protein metabolism related to milk synthesis.
You can access .pdf copies of Dr. McGuire's research here:
Nutrient Physiology, Metabolism and Nutrient-Nutrient Interactions
Methodology for the In Vivo Measurement of the Delta-9-Desaturation of Myristic, Palmitic, and Stearic Acids in Lactating Dairy Cattle
Differential Biohydrogenation and Isomerization of [U-13C]Oleic and [1-13C]Oleic Acids by Mixed Ruminal Microbes