Esmaeili, Hossein Shakeri, Amir Pasha Rad, Zia Nosrati Arani, Ehsan Baghal Villanueva-Saz, Sergio Ruiz, Héctor Lacasta, Delia Causes of abortion in Iranian sheep flocks and associated risk factors Vet. res. commun. 10.1007/s11259-022-09986-5 2022 2022