Development and evaluation of a mathematical model to predict the nutritional value of rations for cattle liable to rumen fiber mass restrictions / Desenvolvimento e avaliação de um modelo matemático para predição do valor nutricional de rações para bovinos sujeito às restrições da massa de fibra no rúmen

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

A mathematical model based on Cornell Net Carbohydrate and Protein System (CNCPS) was developed and adapted to evaluate beef cattle rations at tropical climate conditions. The presented system differs from CNCPS in the modelling of insoluble particles digestion and passage kinetics, which allowed to estimate ruminal fiber mass and its effects on animal performance. The equations used to estimate metabolizable protein and net energy requirements for gain, net energy requirement for maintenance and total efficiency of metabolizable energy utilization were obtained from scientific articles published in Brazil. The parameters of the regression equations in these papers were estimated using data from Bos indicus purebred and crossbred animals raised under tropical conditions. The model was evaluated by using a 368 information database originally published on 11 Doctoral thesis, 14 Master of Science dissertations and 4 scientific articles. From this database, 107 information were selected in order to compare the proposed system with CNCPS. Outputs of the model were considered adequate, and its predictive power was superior than CNCPS, mainly on higher levels of fiber intake.

ASSUNTO(S)

digestion kinetics cinética digestiva bioenergetics fiber bovine bovino bioenergética nutricao e alimentacao animal fibra

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