Desempenho produtivo e características de carcaça de garrotes nelore terminados em semiconfinamento submetidos à suplementação mineral com flavomicina com adição ou não de monensina

Abstract

The use of additives to improve production animal performance has been extensively studied and has a wide acceptance by the community of breeders. With this in mind, the objective was to evaluateto evaluate the association with flavomycin and monensin in male Nellore, not castrated cattle, finished in semi-confinement system, and its effects on the average daily weight gain, the trim level and the yield of the carcass. The experiment lasted 68 days, in D0 the animals were separated in two groups: NF: 54 Nellore treated with flavomycin; and NFM: 57 Nellore treated with flavomycin plus the addition of 200mg of monensin. Both were set in two lots of Brachiaria decumbens cv. Basilisk and were treated with feedat 7:00 a.m. and 16:00 p.m., so as to provide 4kg/animal/day.There was no effect (p>0,05) on slaughter weight between the two groups. Monensin influenced (p<0,05) the total weight gain, represented by a difference of 7,700 kg at the end of the experiment. It has affeceted (p<0,05) the averagy daily gain with monensin use. The ration with monensin alter (p<0,05) the porcentage of weight gain of the treated animals, and the NFM were 2% higher. As expected, adding monensin did not influenced (p>0,05) the carcass yield and also not changed (p>0,05) the trim level. Finnancially, the addition of monensin represented a proat of R$ 16,60 per animal, therefore, its addition to ration was viable for the producer.