A solution of cholesterol in arsenic trichloride is colored pink, the color rapidly changing to cherry-red, accoding^([sic]) to Kahlenberg (Journ. biol. Chem. through Rép. pharm. XXXV. 282), while isocholesterols produce a blue color, which gradually changes to purple, dark red and finally to green.
Source: wiktionary
It is of interest that horse sebum contains squalene, whereas the seba of ruminants, including sheep, goat, llama and dromedary, contain isocholesterol.
Source: wiktionary
Guinea pig, mouse and rabbit. All these seba are similar in lacking squalene, isocholesterol and triglycerides, exhibiting low values for free fatty acids and containing lathosterol (Wheatley, 1953, 1956; Wheatley & James, 1957).
Source: wiktionary