Rendimiento de la canal y ganancia de peso en vacas de descarte con inducción del anestro por vías quirúrgica versus mecánica

Abstract

The purpose of this research is to assess the weight increment of crossbred cull cows with intra-uterine device (IUD) versus cows surgically neutered. To determine the efficacy of treatments, cows were grouped as follows: Gl: 15 cows (control), G2:19 cows neutered, and G3:15 cows IUD. Animals were fed on natural pasture, being Gatton panic the most abundant. Weight controls were registered at the beginning of the assay, and then every thirty days during a period of 120 days. Finally, to register the carcass performance of the groups, cows were slaughtered with a previous fast of 12 hours. Significant liveweight differences were observed between Gl and G3 (120 days): 77.6 vs. 108 kg (p<0.05), and between G2 and G3 (120 days): 81.4 vs. 108 kg (p<0.05). Statistical differences in carcass performance were observed between Gl and G2:51.02 vs. 52.94% (p<0.05). No significant differences were observed between Gl and G2 (120 days): 77(120 days): 77.6 vs. 108 kg (p<0.05), and between G2 and G3 (120 days): 81.4 vs. 108 kg (p<0.05). Statistical differences in carcass performance were observed between Gl and G2:51.02 vs. 52.94% (p<0.05). No significant differences were observed between Gl and G2 (120 days): 77):77.6 vs. 81.4 kg. Results indicate that animals from group G3 gained more weight in comparison to Gl and G2. Regarding carcass performance, groups G2 and G3 revealed a better efficiency. It can be concluded that the use of IUD leads to a better cost-benefit relationship.