Desempenho e viabilidade econômica da suplementação proteica de novilhos de corte em pasto no período das águas e transição águas-seca

• Ano de defesa: 2012
• Autor(a) principal: Pereira Junior, Wolney Alvim
• Orientador(a): Paulino, Mário Fonseca
• Banca de defesa: Zervoudakis, Joanis Tilemahos , Veloso, Cristina Mattos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado Profissionalizante em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Bovinos; Forragem; Ganho de peso
• Palavras-chave em Inglês: Cattle; Forage; Weight gain
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5978

The objective of this experiment was to evaluate performance and economic viability of protein supplementation of grazing beef cattle in the dry-wet transition season. Eight non-castrated Nellore steers with body weight in fasting of 371±11.3 kg were used in the experiment. The experimental treatments were the following: MS Mineral supplement; PMS 20% FS Protein mineral supplementation with 20% CP composed of corn, soybean meal, urea and mineral mixture with daily average intake of 410 g/animal; PMS 40% UR protein mineral supplementation with 40% of CP, composed of corn, urea and mineral mixture with average daily intake of 223 g/animal; and PMS 40% UP Protein Mineral Supplementation with 40% of CP, composed of corn, urea, protect urea and mineral mixture with daily average intake of 236 g/animal. It was used a complete random design with 20 replicates per treatment and the test of Tuckey in the statistical analysis of the data. There was a difference in the results (P<0.05) of PMS 40% UP compared with MS with daily average gains of 1.06 kg/animal for PMS 40% UP and 0.95 kg/animal for MS, respectively. There were no differences in the daily average gain (DAG) (P>0.05) between PMS 40% UP, PMS40% UR and PMS 20% FS. There was difference (P<0.10) in the fat accumulation rate in longissimus dorsi muscle in the treatment PMS 40% UP, which presented 0.018 mm of fat accumulation/day in relation to the treatment PMS 40% UR, which presented 0.011 mm of fat accumulation/day. Fat accumulation rate in longissimus dorsi did not differ (P>0.10) among treatments PMS 40% UP, PMS 20% FS and MS. It was not found any effect (P>0.10) on any of the treatments on fat accumulation rate in the rump region (FARP8). All treatments presented a positive net margin. The best net margin was observed for treatment PMS 40% UP, that is, R$123.92 per animal/period, whereas the smallest was observed in treatment PMS 20% FS, that is, R$98.91 per animal/period. The greatest differential of net margin in relation to treatment MS was found in treatment PMS 40% UP, R$9.29 per animal/period or 8,1% of additional revenue. When simulating pasture production integration with confinement system, it was found that supplements PM and PMS 20% did not reduce permanence time of animals in confinement. Animals supplemented with PMS 40% UR can reduce confinement period by two days, saving R$9.60, whereas those supplemented with PMS 40% UP can reduce condiment period by five days saving R$24.00.