Morphological changes of the calamus of growing remiges feathers in pigeons by Martínez-Calles, María del Rosario, Garrido-Fariña, Germán Isauro, González-Díaz, Francisco Rodolfo, Nieto-Bordes, José Luis, Juárez-Mosqueda, María de Lourdes, Soto-Zárate, Carlos Ignacio, Higuera-Piedrahita, Rosa Isabel, García-Tovar, Carlos Gerardo