Heat stress and ACTH administration on cortisol and insulin-like growth factor I (IGF-I) levels in lactating Holstein cows - Titto, C.G.; Negrão, J.A.; Titto, E.A.L.; Canaes, T.S.; Titto, R.M.; Leme-dos-Santos, T.M.; Henrique, F.L.; Pereira, A.M.F. (2015)