Endocrine Causes of Seasonal and Lactational Anestrus in Farm Animals : A Seminar in the CEC Programme of Co-ordination of Research on Livestock Productivity and Management, Held at the Institut Für Tierzücht Und Tierverhalten, Mariensee, Bundesforschumgsanstalt Für Landwirtschaft (fal) October 2–3, 1984

F. Ellendorff, F. Elsaesser (auth.), F.