Avaliação da cinética de trânsito gastrintestinal de volumosos utilizando diferentes modelos matemáticos e indicadores em bovinos

• Ano de defesa: 2008
• Autor(a) principal: Abreu, Claudilene Lima de
• Orientador(a): Pereira, José Carlos
• Banca de defesa: Leonel, Fernando de Paula , Cunha, Daniel de Noronha Figueiredo Vieira da , Lana, Rogério de Paula
• 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: Cinética de trânsito; Fontes volumosas; Indicadores; Modelos matemáticos
• Palavras-chave em Inglês: Kinetics of transit; Sources bulky; Indicators; Mathematical models
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5762

The objective of this research was to assess the kinetics of gastrointestinal transit of bulky using different mathematical models and indicators in cattle. It was used four Flemish-Zebu steers, fistulated in the rumen, distributed in experimental design 4 x 4 Latin square, and kept in confinement in individual stalls receiving daily 1 kg of concentrate and forage freely. The experimental treatments consisted of four sources of fiber, which were: silage corn (Zea mays), sugar cane (Saccharum officinarum), hay of ramie (Boehmeria nivea) and hay from tifton (Cynodon spp). The concentrate diet consisted of ground corn, soybean meal, urea and mineral supplement. We used the models G1 → G1 → O, proposed by Grovum and Williams (1973), G1 (n) → The proposed by Dhanoa et al. (1985) and G2 → G1 → The proposed by Pond et al. (1988) to estimate the passage rate of particles and the models proposed by G1 → Colluci et al. (1990) and G2 → proposed by Ellis et al. (1994) to estimate the rate of movement of fluids. We used the chrome mordant and Ytterbium as indicators of solid phase and cobalt-EDTA as indicators of the liquid phase. Comparisons between models were made by means of waste analysis and standard deviation standardized asymptotic. Among the models and markers studied to assess the kinetics of particles, the model G1 (n) → O (multicompartmental, proposed by Dhanoa et al., 1985) and the indicator registered chrome best fit for the passage rate of particles from sources Fiber distinct. The model G2 → (time-independent, proposed by Ellis et al. 1994) obtained better results, showing that the dependence of time to have a mixture of fluids existing with being inserted into the compartment.