The aim of the present study was to evaluate the chemical composition and in situ m i n a l degradability of different Sugar Beet Pulp (SBP) sources produced in Noh-East Iran. Chemical composition of the samples includng Cmde Protein (CP), Neutral Detergent Fiber (NDF), AcidDetergent Fiber (ADF), Ether Extract (EE) and total ash were determined. In situ m i n a l degradability parameters of DM and NDF were determined using four minally fistulated Holstein steers. Significant dfferences were found among various SBP samples for DM, CP, NDF, ADF and ash contents and fiber compounds (NDF and ADF) were the most variable components. Content of NDF varied from 2303.4873% with a mean of 34.5% and Standard Deviation (SD) of 7.1% ADF content ranged from 11.43-24.26% with an average of 17.3%. In addition, comiderable variation was obsenred in degradation parameters includng rapidly degradable fraction (a), slowly degradable fraction (b), fractional degradation rate (c), Potential Degradability (PD) and the Effective Degradability (ED) of DM and NDF. The a-fraction of DM varied markedly from 0.012-0.584 with a mean of 0.401 (+O.l58). Moreover, c-value of NDF ranged from 0.042-0.074 h-\\\' with average of 0.054. It was concluded that the chemical composition and m i n a l degradation parameters of SBP dffers considerably among various SBP sources.

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