Media type: E-Article Title: Pregnancy rates in cows and heifers inseminated at predetermined times using progesterone-releasing intravaginal devices Contributor: Ellicott, Allen R.; Thompson, Carl E.; Hill, James R. Published: Elsevier BV, 1977 Published in: Theriogenology, 8 (1977) 6, Seite 315-321 Language: English DOI: 10.1016/0093-691x(77)90183-2 ISSN: 0093-691X Keywords: Equine ; Animal Science and Zoology ; Food Animals ; Small Animals Origination: Footnote: