178 Fixed-time artificial insemination in virgin beef heifers using a seven-day progesterone-based protocol: gonadotrophin-releasing hormone versus oestradiol salts

- Author Affiliations

^A National Institute of Agricultural Technology, Chacra Experimental Integrada Barrow (MDA-INTA), Tres Arroyos, Buenos Aires, Argentina

^B Veterinary Consultant, Orense, Buenos Aires, Argentina

^C CONICET/INTA, Tres Arroyos, Buenos Aires, Argentina

^D National University of Tres de Febrero, Caseros, Buenos Aires, Argentina

^E Health Sciences Research Center, Anáhuac University of México, Naucalpan de Juárez, México, México

^F Conservation, Genetics & Biotech, LLC, Valley City, North Dakota, USA

^G Mayville State University, Mayville, North Dakota, USA

^H Livestock Research Section, Alberta Agriculture and Forestry, Edmonton, Alberta, Canada