Use of ultrasound echography on-the-farm to detect abnormalities of the urogenital tract of sows F. MADEC, Françoise MARTINAT-BOTTE, Y. FORGERIT, M. LE DENMAT and J.C. VAUDELET Ann. Zootech., 36 3 (1987) 305 DOI: 10.1051/animres:19870322