Values for protein/fat ratio and milk urea nitrogen in milk from dairy cows in northern Alajuela and Heredia, Costa Rica. Ciencias Veterinarias [Internet]. 2017 Jan. 14 [cited 2024 Apr. 29];34(2):67-80. Available from: https://www.revistas.una.ac.cr/index.php/veterinaria/article/view/9030