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Wichtel, J., Keefe, G. P., & Riley, C. B. (2005). Oral melengestrol acetate treatment for out-of-season breeding in the sheep possessing an extended breeding season: is prostaglandin F2a beneficial? In G. C. Fthenakis & Q. A. McKellar (Eds.), Proceedings of the 6th International Veterinary Sheep Congress (pp. 328-329). Herisonissor, Crete.