Consumo alimentar residual, digestibilidade aparente e comportamento ingestivo de touros da raça nelore

• Ano de defesa: 2014
• Autor(a) principal: Menezes, Rayanne Galdino
• Orientador(a): Fernandes, Juliano José de Resende
• Banca de defesa: Oliveira Júnior, Reinaldo Cunha de, Paula, João Teodoro de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Ciência Animal (EVZ)
• Departamento: Escola de Veterinária e Zootecnia - EVZ (RG)
• País: Brasil
• Palavras-chave em Português: Alimentação; Bovinos de corte; Confinamento; Eficiência alimentar; Ruminação; Seleção
• Palavras-chave em Inglês: Feeding; Beef cattle; Feedlot; Feed efficiency; Rumination; Selection
• Área do conhecimento CNPq: PRODUCAO ANIMAL::CRIACAO DE ANIMAIS
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/4009

Feed efficiency of cattle and its correlation with feeding behavior and apparent digestibility of nutrients is the objective of this work. Feed efficiency is one of the most important traits in livestock .Processes responsible for more than 25% of feed efficiency variation have not been clarified. Explain variation sources and identifying efficient animals are the most importantobjectives for the beef cattle production nowadays. An alternative tool to evaluate the feed efficiency is the residual feed intake (RFI), was developed in 1963, but only in the 90’sit started to be used to identify and select efficient animals. Feeding behavior is directly related to feed ingested quantity, which differs in efficient or inefficient animals . The feeding behavior and apparent digestibility of 120 Nellore animalswere evaluated in completely randomized design with respect to feed conversion ratio (FCR) and the three classes of residual feed intake: low, medium and high RFI. The age and initial body weight were 20 months and 397 ± 35 kg. The animals were placed in individual pens fitted with feeding troughs and dri nkers. The diet offered to the animals consisted of 23% forage and 77% concentrate. The experimental period lasted 84 days, with weighings every 28 days. All weighings were preceded by fasting for 16 hours. The behavior evaluation was performed in a 24 hour period. Samples were collected from the diet offered and the leftovers at the beginning of adaptation and weekly during the experimental period, moreover, were also collected stool samples during three consecutive days at different times in order to obtain a sample throughout the day.The duration time of all activities was similar among the different groups.The variables evaluated digestibility did not differ (P > 0.05) between animals of three classes of RFI. It can be concluded that the RFI has no correlation with feeing behavior and apparent digestibility of nutrients in the diet.