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By Luis Vargas
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Turix model is a new mechanistic dynamic model that can be used for feed evaluation under tropical conditions. The objective of this study was to use this model, along with in situ and in vitro sugar cane experimental data from a previous study, to evaluate sugar cane kinetics through estimation of three parameters associated with ruminal bacterial growth which were: kM,SmL, the substrate uptake; kLM, the bacterial growth from intermediate metabolite; and YVFAP,FS, the volatile fatty acids related products yield. Values of these parameters for the integral cane and its fractions NDF and ADF were: a) kM, SmL, 16.20, 50.47 and 21.97 mL h-1 (mg M)-1; b) kLM, 96.00, 543.00 and 1 680.00 h-1; and c) YVFAP, FS, 1.02, 0.40 and 0.23 g g-1, respectively. Results from the model adjustment showed a slow microbial substrate uptake and a low M yield for integral cane. The higher substrate uptake was obtained for NDF, while the higher M yield was obtained for ADF. In addition, the model and its benefit for kinetic evaluation of sugar cane was determined using its biological structural validity, model testing and sugar cane system evaluation. More studies are required to evaluate the Turix model usefulness in the feed analysis since more experiments develop new approaches in the ruminal system evaluation.

About the author

El Dr. Luis Vargas es profesor investigador del Colegio de Postgraduados, Mexico. Se dedica a la investigación y a la imparticion de cursos sobre modelacion de procesos dentro de los sistemas de producción. Es el fundador y coordinador de la red de modelos bio-matematicos, bioeficiencia ( Es autor y coautor de articulos cientificos sobre modelos y asesor de estudiantes de maestria y doctorado dentro del Colegio de Postgraduados, así como en otras instituciones (correo:

Dr. Luis Vargas is a research professor at the Postgraduate College, Mexico. It is dedicated to research and teaching of courses on modeling processes within production systems. He is the founder and coordinator of the network of bio-mathematical models, bioeficiencia ( He is author and co-author of scientific articles on models. Also, he is amaster's and Doctor`s student advisor at Postgraduate College and other institutions (email: