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Research Article
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Comparison of Metabolizable Energy Values of Roughages Determined by Regression
Equations Using in vivo and in vitro Parameters |
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Hulya Ozkul ,
Yilmaz Sayan ,
Muazzez Polat
and
Tulug Capci
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ABSTRACT
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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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