Turnover of carbon isotopes in tail hair and breath CO2 of horses fed an isotopically varied diet.
Ayliffe LK, Cerling TE, Robinson T, West AG, Sponheimer M, Passey BH, Hammer J, Roeder B, Dearing MD, Ehleringer JR. Turnover of carbon isotopes in tail hair and breath CO2 of horses fed an isotopically varied diet. Oecologia. 2004 Mar; 139(1):11-22.