Constraints to milk production in grazing dairy cows in Brazil and management strategies for improving their productivity - Abdalla, Adibe Luiz; Louvandini, Helder; Bueno, I. C. S; Vitti, Dorinha Miriam Silber Schmidt; Meirelles, Cyro Ferreira; Gennari, Solange Maria (Preventive Veterinary Medicine, 1999)