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Study on Supplementing Effects or Feeding Systems of Molasses and Urea on Methane and Microbial Nitrogen Production in the Rumen and Growth Performances of Bulls Fed a Straw Diet

Huque, K.S.    (Animal Production Research Division, Bangladesh Livestock Research Institute   ); Chowdhury, S.A.    (Animal Production Research Division, Bangladesh Livestock Research Institute  );
  • 초록

    An experiment with growing bulls were conducted to determine the effect of supplementation of a straw (S) with 15% molasses and 3% urea as an intimate mix (UMS) on its dry matter (DM) intake and digestibility (DMD) and reduction of methane ( $CH_4$ ) production from fermentation in vitro of the straw. In the next experiment, the feeding of the UMS was compared with that of the feeding of molasses and urea in meals (DS) or in lick blocks (DSUMB) as supplements to straw. The UMS feeding increased daily intake of straw DM ( $89.5 g{\cdot}kgW^{-0.75}$ , p $508mg{\cdot}kgW^{-0.75}{\cdot}d^{-1}$ , p $65g{\cdot}kgW^{-0.75}$ , 55 g and $8.0mg{\cdot}kgW^{-0.75}{\cdot}d^{-1}$ , respectively). It also increased the digestibility of DM ( $594g{\cdot}kg^{-1}$ , p $641g{\cdot}kg^{-1}$ , p $619g{\cdot}kg^{-1}$ , p $CH_4$ emitted per g of DOM apparently fermented in the rumen (DOMR) was 91.0 ml in the 'S' and reduced (p $516g{\cdot}kg^{-1}$ , p $490g{\cdot}kg^{-1}$ , respectively) in association with the increased microbial N yield in the rumen (14.1, 5.62 or $17.0g{\cdot}kg^{-1}$ DOMR, respectively, p 0.05, respectively). It can be concluded that molasses and urea feeding as an intimate mix with straw (UMS) increased its digestion and intake in association with a reduced methane emissions in the rumen. When compared with that of their feeding in meals or in lick blocks as supplements to straw the UMS gave the highest straw in take and digestion and live weight gains of growing bulls concurring the finding that the UMS system may be the best way of molasses and urea feeding to ruminants fed straws.


  • 주제어

    Straw .   Methane .   Microbial Nitrogen .   Growing Bulls.  

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