The aim of the study was to compare the Metabolizable Energy (ME) values of some roughages which were calculated from regression equations using in vivo and in vitro parameters and to determine the most suitable regression equations using in vitro parameters. For this purpose, in vivo ME values and in vitro Crude Nutrients (CN), Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), enzyme soluble/insoluble organic matter (ELOS/EULOS) and 24 h Gas Production (GP) amounts of 40 roughages were used. In the study, in vitro ME values of roughages were calculated by regression equations where in vitro parameters were used and these results were compared with their in vivo ME values. According to the obtained results, in vitro ME values were estimated more better with equations where, NDF or especially ADF was used than with equations where, CN or ADL was used. Besides, the prediction was improved in regression equations which were constituted by the combination of crude nutrients and ELOS/EULOS or combination of crude nutrients and GP. However, it can be suggested that, using of ADF instead of Crude Fiber (CF) in equations would be more correct.
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Hulya Ozkul, Yilmaz Sayan, Muazzez Polat and Tulug Capci, 2005. Comparison of Metabolizable Energy Values of Roughages Determined by Regression Equations Using in vivo and in vitro Parameters . Pakistan Journal of Biological Sciences, 8: 696-700.
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