Evaluación del Efecto de los Anabólicos: Zeranol y Boldenona en Toretes Brahman Mestizoz Alimentados con pasto Saboya Panicum maximun,

Abstract

In the Reina del Cisne Farm, located in Las Palmas-Piñas, El Oro Province, at 1014 m.a.s.l., the productive behavior of Brahman crossbred steers was evaluated by means of applying two anabolics, Zeranol and Boldenona. This treatment will be compared to a control treatment (with no anabolics). Eight animals were used in the treatment, and they were distributed under a completely randomized design. The experimental results were subjected to variance analysis and mean separation through Waller Duncan´s test. Highly significant differences were determined pro Zeranol from which the animals reached 407 Kg final weight; weight gaining 0,887 Kg/day; feeding conversion 13,63; U. S. $ 2,55 weight gaining cost/Kg; and getting a final body condition of 8,63 out of 9 points. Conerning Boldenona, 386,25 Kg final weight; was registered increasing 0,714 Kg/day; U.S. $ 3,10 weight gaining cost/Kg; and getting a final body condition of 7,88 points. Zeranol results compared to group control exceeded 41,00 Kg as final weights; the feeding conversion diminished to 7,62 saving U.S. $ 1,43 weight gaining, all of them in favor to the use of Zeranol, because it showed the best benefit cost (U.S. $ 1,39); therefore it is recommended to use the injectable anabolic Zeranol in priming Brahman crossbred steers.