Vidal, B., 		Silva, G., 		Santos, J., 		Dias, F., 		Lima, A., 		Viana, E., 		Neves, W., 		Viana, G., 		Gomes, M., & 		Cavalcante, T.
(2013).
 Estrus Identification Through Colpocytology in Sows in Intensive Free-Range Breeding.
<em>Journal Of Veterinary Advances, 3</em>(10), 281-284.
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