Características de crescimento e qualidade da carne de novilhas de corte de diferentes classes de consumo alimentar residual

• Ano de defesa: 2009
• Autor(a) principal: Reis, Simone Frotas dos
• Orientador(a): Paulino, Pedro Veiga Rodrigues
• Banca de defesa: Paulino, Mário Fonseca , Detmann, Edenio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Bovinos; Carcaça; Maciez
• Palavras-chave em Inglês: Cattle; Carcass; Softness
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::EXIGENCIAS NUTRICIONAIS DOS ANIMAIS
• Link de acesso: http://locus.ufv.br/handle/123456789/5636

Residual feed intake (RFI), as an index to evaluate feed efficiency, has been widely used, because is independent of growth traits of the animals. However, the relationship between RFI groups, nutritional and growth parameters are insufficient and the data are contradictory. Therefore, were evaluated, to growth traits, nutrients digestibility and performance thirty one beef heifers, three-cross, of three different genetic groups: CRANN- ½ Caracu ¼ Angus ¼ Nellore (n=9), CRVN- ½ Caracu ¼ Valdostana ¼ Nellore (n=13) and RCN- ½ Red Angus ¼ Caracu ¼ Nellore (n=9). The initial age and initial body weight of the animals were 22 months and 342±14 kg; 311±16 kg; 352±14 kg, to genetic groups CRANN, CRVN and RCN, respectively. The animals were allocated in individual pens in feedlot for 84 days, receiving a diet of roughage: concentrate ratio of 40:60. They were separated in three different efficiency groups (high, medium and low CAR), according to their residual feed intake. The residual feed intake was defined as the difference between an animal s actual feed intake and its expected feed requirements for it's gain. No difference were observed for RFI groups (P>0.05) in performance (1.40 kg/day) and apparent digestibility of nutrients, that were similar (P>0,05) between the RFI groups. The means values for apparent digestibility for the nutrients were; dry matter (64.00%), crude protein (60.01%), ether extract (72.90%), neutral detergent fiber (54.80%), nonfiber carbohydrate (78.91%). The growth traits; backfat thickness, Longissumus muscle area and rump fat thickness, evaluated by ultrasound, also were similar in the different residual feed intake groups. The carcass traits and meat quality do not differ between residual feed intake groups (P>0.05). The selection by residual feed intake is interesting, since the low CAR (efficient animals) have the same quality pattern of the meat and carcass than high CAR (inefficient animals).