1.
Calamari CV, Ferrari S, Leinz FF, et al. Evaluation of two methods for early pregnancy diagnosis in ewes: transrectal ultrasonography and pregnancy detector for small ruminant (DPPR-80®). Braz. J. Vet. Res. Anim. Sci. 2003;40(4):261-266. doi:10.1590/S1413-95962003000400004