PS-17-028 Volume measurement of female Sprague-Dawley mammary tumors induced by N-methyl-N-nitrosourea: Comparing ultrasonography and caliper A. Faustino-Rocha * , C. Teixeira-Guedes, J. Pinho-Oliveira, R. Soares-Maia, R. Arantes-Rodrigues, B. Colaço, R. Ferreira, P. Oliveira, M. Ginja * UTAD, Dept. of Veterinary Sciences, Vila Real, Portugal