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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Cin?tica de tr?nsito e de degrada??o ruminal da fibra de silagens do res?duo da cultura de abacaxi em bovinos / Kinetics of transit and ruminal degradation of fiber of silages of the residue pineapple crop in cattle

Oliveira, Graciele Ara?jo de January 2011 (has links)
Folha de aprova??o n?o presente na vers?o entregue. / Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T12:07:32Z No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T12:09:38Z (GMT) No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-11-18T12:09:38Z (GMT). No. of bitstreams: 2 graciele_araujo_oliveira.PDF: 736032 bytes, checksum: 8f4728012526a950d2e16deec5ce1e59 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2011 / O estudo foi conduzido com o objetivo de determinar os par?metros cin?ticos de degradabilidade in situ da mat?ria seca (MS) e da fibra em detergente neutro (FDN) e de passagem de materiais oriundos da silagem do res?duo da cultura do abacaxi (partes a?reas). Foram utilizados quatro tratamentos: 1- silagem do res?duo da cultura do abacaxi sob compacta??o de 600 Kg/m?, 2- silagem do res?duo da cultura do abacaxi sob compacta??o de 700 Kg/m?, 3- silagem do res?duo da cultura do abacaxi sob compacta??o de 900 Kg/m?, 4- silagem do res?duo da cultura do abacaxi sob compacta??o de 1000 Kg/m?. Ap?s a ensilagem do material oriundo da planta??o, avaliaram-se a cin?tica de tr?nsito de part?culas e cin?tica de degrada??o ruminal. Para a cin?tica de tr?nsito de part?culas foi utilizado como indicador o cromo para marcar a fibra. As taxas de passagem foram determinadas por meio da recupera??o dos indicadores nas fezes do animal. No ensaio de degrada??o foram incubadas as amostras em bolsas de n?ilon nos tempos 0, 6, 18, 48 e 96 horas. O comportamento apresentado nas curvas de regress?o das vari?veis analisadas descreve uma alta correla??o entre elas, ou seja, o tempo em que a silagem fica retida no r?men exerce influ?ncia na sua digestibilidade e na sua taxa de degrada??o. De fato, quanto maior o tempo em que um alimento estiver no r?men, mais a??es digestivas ele sofrer? e por consequ?ncia vai ser mais digerido. Embora a silagem sob press?o de compacta??o de 900Kg/m? apresente uma maior fra??o potencialmente digest?vel, recomenda-se o uso da silagem sob press?o de compacta??o de aproximadamente 750Kg/m?, devido ao menor custo e por apresentar menor tempo m?dio de reten??o r?men ret?culo e reple??o ruminal, aumentando assim a din?mica ruminal de degrada??o e passagem. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, [2011]. / ABSTRACT The study was conducted to determine the kinetic parameters of in situ dry matter (DM) and neutral detergent fiber (NDF) and the movement of materials from the waste silage of pineapple crop (aerial parts). It was used four treatments: 1- crop residue silage pineapple under compression of 600 kg/m?, 2- silage crop residue pineapple under compression of 700 kg/m?, 3- silage crop residue pineapple under compression 900 kg/m?, 4- silage crop residue pineapple under compression of 1000 kg/m?. After ensiling the material from the plantation, it was evaluated the kinetics of passage of particles and kinetics of ruminal degradation. For the kinetics of passage of particles was used as an indicator to mark the chromium fiber. Leakage rates were determined by means of the indicators of recovery in the feces of the animal. In the degradation assay samples were incubated in nylon bags at 0, 6, 18, 48 and 96 hours. The behavior presented in the regression curves of the variables describing a high correlation between them, in other words, the time when the silage is retained in the rumen influence on its digestibility and its rate of degradation. In fact, the longer that a food is in the rumen, he will suffer more digestive actions and therefore will be more digestible. Although silage compression pressure 900kg/m? present a higher potentially digestible fraction, we recommend the use of silage compaction pressure of about 750kg/m?, due to lower cost and have lower average retention rumen and reticulum ruminal fill, thus increasing the dynamic ruminal degradation and passage.

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