A short-term comparison of wheat straw and poplar wood chips used as litter in tiestalls on hygiene, milk, and behavior of lactating dairy cows oleh M. Simoni, N. Mezzasalma, R. Pitino, C.L. Manuelian, C. Spadini, M. Iannarelli, S.L. Montanaro, A. Summer, C.S. Cabassi, M. De Marchi, F. Righi