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Santos JEP, Thatcher WW, Chebel RC, Cerri RL, Galv\u00e3o KN. The effect of embryonic death rates in cattle on the efficacy of estrus synchronization programs. <i>Anim Reprod Sci<\/i> 2004; 82-83: 513\u2013535.","DOI":"10.1016\/j.anireprosci.2004.04.015"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Cabrera VE. A simple formulation and solution to the replacement problem: a practical tool to assess the economic cow value, the value of a new pregnancy, and the cost of a pregnancy loss. <i>J Dairy Sci<\/i> 2012; 95: 4683\u20134698.","DOI":"10.3168\/jds.2011-5214"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Garc\u00eda-Ispierto I, L\u00f3pez-Gatius F, Santolaria P, Y\u00e1niz JL, Nogareda C, L\u00f3pez-B\u00e9jar M, De Rensis F. 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