Values for protein/fat ratio and milk urea nitrogen in milk from dairy cows in northern Alajuela and Heredia, Costa Rica. Cienc. vet. [Internet]. 2017 Jan. 14 [cited 2025 Apr. 24];34(2):67-80. Available from: https://www.revistas.una.ac.cr/index.php/veterinaria/article/view/9030