@article{sper_whitacre_bailey_schramme_orellana_ast_vasgaard_2012, title={Successful reduction of a monozygotic equine twin pregnancy via transabdominal ultrasound-guided cardiac puncture}, volume={24}, ISSN={["0957-7734"]}, DOI={10.1111/j.2042-3292.2011.00254.x}, abstractNote={Summary 
In horses, twin pregnancy is pathological and represents a potentially life-threatening condition to the mare and foal. Twinning occurs in approximately 2% of pregnancies. Of these, the majority of cases are dizygotic twins, resulting from 2 ovulations and monozygotic twins are rare. A 12-year-old Quarter Horse mare was presented for breeding management with shipped cooled semen and embryo transfer. Seven days post ovulation, a single late morula/early blastocyst was recovered and transferred immediately to a recipient mare. Thirty-six days after transfer, transrectal ultrasound examination revealed the presence of 2 embryos. A transcutaneous reduction of one of the fetuses was performed successfully at 128 days of gestation. This report is the first to describe a successful reduction of monozygotic twins by transcutaneous ultrasound-guided cardiac puncture.}, number={2}, journal={EQUINE VETERINARY EDUCATION}, author={Sper, R. B. and Whitacre, M. D. and Bailey, C. S. and Schramme, A. J. and Orellana, D. G. and Ast, C. K. and Vasgaard, J. M.}, year={2012}, month={Feb}, pages={55–59} }
 @article{schramme-josson_2009, title={Diagnosis and management of twinning in mares}, volume={31}, number={5}, journal={In Practice (London, England)}, author={Schramme-Josson, A.}, year={2009}, pages={226–231} }