Fósforo disponível em dietas com ou sem ractopamina para fêmeas suínas em terminação tardia

• Ano de defesa: 2010
• Autor(a) principal: Campos, Priscila Furtado
• Orientador(a): Ferreira, Aloízio Soares
• Banca de defesa: Donzele, Juarez Lopes , Brustolini, Paulo César
• 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: Suínos em terminação; Exigências nutricionais; Desempenho; Carcaça
• Palavras-chave em Inglês: Finishing gilts; Nutritional requirements; Performance; Carcasse
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::AVALIACAO DE ALIMENTOS PARA ANIMAIS
• Link de acesso: http://locus.ufv.br/handle/123456789/5654

With the objective to evaluate levels of available phosphorus in diets with or without ractopamina, were used 112 gilts with high genetic potential for meat deposition with initial weigh of 94.00 ± 2.28 kg distributed in a completely randomized block design, in a 4x2 factorial scheme (0,109; 0,209; 0,309; e 0,409% of available phosphorus and 0 or 10 ppm with ractopamine) with eight treatments, seven replications and two animals per experimental unit. There was not interaction between levels of phosphorus and ractopamina. The levels of available phosphorus have influenced the daily weight gain and the daily phosphorus intake with increase in a linear form. The feed conversion improved in a quadratic form until with the increase of the available phosphorus levels, until the estimated level of 0.33% of available phosphorus. The ractopamina provided increase in the daily weigh gain and decrease in the feed conversion. The alkaline phosphatase decreased in a linear form with the increase of the available phosphorus levels. The levels of available phosphorus have influenced the bone resistence with increased in a quadratic form until the estimated level of 0.32%. The contents of ash, calcium and phosphorus in the bone increased in a quadratic form until the estimated levels, respectively 0.270; 0.277 e 0.295% of available phosphorus. It was concluded that the level of available phosphorus for gilts of high potential for meat deposition, from 94 to 125 kg, is 0.33%, with corresponds to an available phosphorus intake of 8.67 g day, in diets with 10 ppm of ractopamine.