Efficacy of a combined protocol for re-insemination of open cows after early pregnancy diagnosis using ultrasonography and its effect on fertility Journal title: Open Veterinary Journal Authors: A.O. Gaja| Department of Surgery and Theriogenology, Faculty of Veterinary Medicine, University of T... Subject(s): Biochemistry, Immunology, Microbiology, Parasitology, Veterinary Science, Endocrinology, Pathology and Forensics