Desempenho e viabilidade econômica de tourinhos de diferentes grupos genéticos, suplementados no pasto com fonte mineral ou energético-mineral, com posterior terminação em confinamento

• Ano de defesa: 2017
• Autor(a) principal: Guimarães, Tiago Pereira
• Orientador(a): Restle, João
• Banca de defesa: Rstle, João, Leão, Karen Martins, Bilego , Ubirajara Oliveira, Okada, Eliane Sayuri Miyagi, Ribeiro, Marinaldo Divino
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Zootecnia (EVZ)
• Departamento: Escola de Veterinária e Zootecnia - EVZ (RG)
• País: Brasil
• Palavras-chave em Português: Massa de foragem; Medidas morfométricas; Perfil sanguíneo; Raças de bovinos; Suplemento
• Palavras-chave em Inglês: Beef cattle; Supplements; Morphometric measurements; Blood profile; Economic viability
• Área do conhecimento CNPq: MEDICINA VETERINARIA::REPRODUCAO ANIMAL
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/8120

The aim of this study was to evaluate the performance and economic viability of young bulls backgrounded in rotated pasture of Cynodon spp. cv. Tifton 85, in the rainy season. Eightyone bull calves with average age of 12 months and average weight of 252±33 kg were used. The experiment was conducted in a completely randomized design in a 2x3 factorial arrangement, using mineral supplement (MS) and energy-mineral supplement (EMS), and three genetic groups Nellore (NEL), ½Canchim½Nellore (CAN) and ½Brangus½Nellore (BRN). The average forage availability was 13.6 kg DM/day per animal. The consumption of MS was statistically similar between genetic groups with overall mean of 0.073 kg/day per animal. The consumption of EMS was higher for the BRN with 2.10 kg/day, followed by CAN with 1.57 kg/day and lower for NEL with 1.28 kg/day. Average daily weight gain (ADG) and total weight gain were higher for animals receiving EMS than those receiving MS (P<0.05). In the MS treated animals, the BRN had ADG of 0.64 kg, and the NEL and CAN were similar with average of 0.46 kg/day. For animals that consumed EMS, the CAN had higher ADG with 0.97 kg, and the NEL and BRN were similar with average of 0.86 kg/day. Levels of glucose, cholesterol, total protein, albumin and creatinine were not changed by the type of supplement or genetic groups. Higher levels of urea were found in NEL and CAN animals with MS. The BRN were more compact, with greater development of chest and hindquarters, the CAN had intermediate development of thorax and hindquarters, and presented greater growth in length, while the NEL had higher growth in height and lower in thorax and hindquarters. The highest spending on MS per animal/day was for the NEL (R$0.14), the lowest for the BRN (R$0.06), and intermediate for the CAN (R$0.07). For animals treated with EMS the highest spending per animal/day was for the BRN (R$1.95), the lowest for the NEL (R$1.14), and intermediate for the CAN (R$1.40). The cost of EMS was higher in all genetic groups in relation to MS. The net income per animal with MS was better for the BRN with R$282.04, followed by the CAN with R$197.18, and lower for the NEL with R$117.21. For bulls that received EMS, the CAN had the best net revenue of R$317.40 per animal, followed by BRN with R$175.55 and lower for NEL with R$165.30. The NEL and CAN bulls that received EMS had a higher economic return than those treated with MS, whereas BRN had a better return for animals treated with MS. The energy-mineral supplement provided better performance of animals. The use of energy-mineral supplement during the rainy season in Tifton 85 grass is recommended only for Nellore and ½Canchim½Nelore bulls, for ½Brangus½Nelore the mineral supplement is recommended.