الفهرس 
Introduction
suger beet topsOnly 14 pages are availabe for public view
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Abstract
This study was planned to evaluate some underutilized feed resources (SBT and RS) as feedstuffs for ruminants through processing it into silage. Sugar beet tops and RS were used in different rations for making silage mixtures with and without silage inoculant (SilAll 4<U+00D7>4) with addition of yellow corn and urea in some mixtures. Quality of the prepared silages was tested at 4, 6, 8 and 12 weeks of ensilage period through determination of pH value and concentrations of lactic, acetic, butyric acids and ammoniaN digestibility. Series of digestibility trials were conducted on 8 bucks (20 kg BW). Rumen fermentation parameters of bucks fed the experimental SBT silage mixtures (pH value, total VFA and ammoniaN concentrations) were evaluated for 2 days at 0, 3, 6 and 9 h post feeding. Some blood serum metabolites (total proteins, albumin, globulin and glucose) as affected by feeding the different SBT/RS silage mixtures were determined. The lowest silage pH value was recorded for IIb SBT/RS silage mixtures, while the highest was for ureated one. The highest content of lactic acid was recorded for IIb SBT/RS silage mixtures, while the lowest was for IVa SBT/RS silage mixtures. The lowest content of acetic, butyric acids and ammonian was recorded for IIb SBT/RS silage mixtures, while the highest was for ureated one. The high voluntary DM intake was recorded for bucks fed IIb and Ib SBT/RS silage. The highest DC of DM, CP, NDF, and ADF was recorded for IIb and Ib SBT/RS silage. For rumen pH value the highest value was recorded for ureated SBT/RS silage throughout sampling time, while the lowest was observed for IIb and Ib SBT/RS silage. Consequently the highest concenteration of total VFA was recorded for both IIb and Ib SBT/RS silage.