Vidal, B., Silva, G., Santos, J., Dias, F., Lima, A., Viana, E., Neves, W., Viana, G., Gomes, M., & Cavalcante, T. 2013 Oct 30. Estrus Identification Through Colpocytology in Sows in Intensive Free-Range Breeding. Journal of Veterinary Advances. [Online] 3:10