Aditivos antimicrobianos e processamento de grão na terminação bovinos de corte confinados

• Autor(a) principal: Camilo, Fernando Rossi
• Data de Publicação: 2017
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/6889
• topic: Ionophoros; Não-ionophoros; Desempenho; Fermentação ruminal; Ionophores; Non-ionophores; Performance; Ruminal fermentation; ZOOTECNIA::PRODUCAO ANIMAL

The experiment 1 objectives were to evaluate the isolated and combined effects of the virginiamycin (VM) and monensin sodium (MON) on performance, feed intake, feed efficiency, ruminal fermentation, and carcass characteristics of beef cattle fed with high concentrate diet, the experiment 2 had the objective evaluate ruminal parameter the bulls Nelore with use the isolated and combined effects of the virginiamycin (VM) and monensin sodium (MON) and the experiment 3 had the objective to determine the optimal moisture content for reconstituted ensiled corn grain, evaluating final moisture concentrations of 27%, 30%, 33%, and 36%. In Exp. 1, 339 crossbred bulls Nellore x Guzera; were used in a randomized complete block design with five treatments and seven replicates. The blocks were defined by initial body weight. The animals were allocated in group pens for 103d, including 28d adaptation period. Treatments were defined by levels of VM and MON (mg/kg of DM) as follows: 30MON; 15VM+30MON; 25VM+30MON; 34VM+ 30MON e 34VM. In the phase of adaptation was no statistical (P>0.05) in body weight initial, body weight final, and average daily gain. Already to dry matter intake have the statistical difference (P<0.05) to compare 30MON vs 34MON e 34VM vs 34VM+30MON, in the phase adaptation the dose association 34VM+30MON have the smaller dry matter intake. In Exp. 2, 15 Nellore bulls with ruminal cannula were used in a randomized complete block design with 5 treatments and 3 replicates. Animals were blocked by initial body weight. The animals were kept in individual pens for 35 days has received the same diet to Exp.1. The sample liquid ruminal was collected in days 0, 7, 14, 21, and 28 for evaluation pH, VFA, N-NH3, and protozoan. After this period was realized the digestibility. The values of pH, NH3-N, and VFA were no differences (P>0.05) for contrast and linear and quadratic regression, except for acetic acid concentration that was difference (P<0.05). The protozoa concentration total had effect in contrast 34VM vs 34VM+30MON (P<0.05), being that the dose 34VM provide more concentration. In the Exp.3 sixty cattle (Bos taurus) were randomized complete block design with 6 treatments and 10 replicates was used. The treatments were corn grain reconstituted with water until they reach to final moisture concentrations of 27 (HMC27%), 30 (HMC30%), 33 (HMC33%), and 36% (HMC36%) and grains were allowed to ensile for 101 days. The steam-flaker corn and dry-rolled corn also were usually with treatment. Were no statistical difference (P<0.05) in performance the cattle confined for 89 days. Already in experiment in vitro the gas production the high moisture corn. To usually the high moisture corn in diet the cattle no increased the performance. Already the processing corn were availed in vitro, high moisture result in high fermentation and gas production.