Rosales Jaramillo, Cornelio AlejandroRodas Carpio, Ermes RamiroNieto Escandón, Pedro EmilioTorres Inga, Carlos SantiagoGordillo Guambaña, Burgos GeovannyAucapiña Cuenca, Cristian DanielMarin Peñaranda, Angel Danilo2018-06-212018-06-2120182224-7920https://revistas.reduc.edu.cu/index.php/rpa/article/view/2187/2016This research took place on the Irquis Farm, University of Cuenca, Victoria del Portete parish, Cuenca canton, province of Anzuay, Ecuador. This research studied the effects of penile spicule extirpation on weight gain and aggressiveness, ents: whole animals without castration, used as controls (T1); animals with extirpation of the gland´s spicules (T2); and chemically castrated animals, using 0.5 ml of 2 % alcohol with iodine, directly injected in each testicle (T3). A total of 90 animals were included, following a randomized block design with six treatments and five replicas. The diet consisted of forage mixture of 33-35 % dry matter, and a commercial feed supplement administered ad libitum. A covariance analysis (ANACOVA) was made, using the initial weight as co-variable. The final weight was significantly influenced by the treatment; the Tukey test resulted in greater final weight in T2, followed by T1. Their behavior was significantly different from T3 (P < 0.05). In relation to aggressiveness, expressed in carcass damage, no significant differences were observed, according to Chi square (P > 0.05).es-ESCobayoEspículas peneanasAgresividadARTÍCULO