Given the BrdU incorporation into DNA of cells, using the Western blot method for detection would be quite challenging. Typically, the immunohistochemistry method is employed for this purpose. When it comes to the application on small intestine samples, the following citation of B5002 via immunohistochemical detection may be useful for protocol reference:
Title: "The ubiquitin ligase ITCH coordinates small intestinal epithelial homeostasis by modulating cell proliferation, differentiation, and migration." Published in Differentiation. Jan-Feb 2018;99:51-61. PMID: 29309986