Ultrasonographic measurement of the equine fetal vitreous body length for predicting days to parturition in Pura Raza Española horses. Ciencias Veterinarias [Internet]. 2019 Oct. 3 [cited 2024 Apr. 29];37(2):1-10. Available from: https://www.revistas.una.ac.cr/index.php/veterinaria/article/view/12501