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KMID : 1025520010430050695
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Journal of Animal Science and Technology
2001 Volume.43 No. 5 p.695 ~ p.706
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Effects of Soluble Carbohydrate on Ruminal Fermentation and Microbial Growth in Continuous Culture
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Abstract
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´this study was conducted to investigate the effects of soluble carbohydrate on ruminal fermentation and microbial growth in continuous culture system. It was consisted of two experiments and the results of this study are as follows.
First experiment was conducted to investigate incorporating pectin into the basal diet to assess effects on its ruminal fermentation and bacterial mass yield. There were no significant differences (P$gt;0.05) in rumen parameters {rumen pH, total lactate, soluble carbohydrate and volatile fatty acids (VFAs)) except for ruminal NH₃-N concentration.
Ruminal NH₃-N was significantly decreased with increasing pectin levels (P$lt;0.05). Although total volatile fatty acid decreased with the increase of pectin level, branched chain fatty acid tended to increase compared with control (P$gt;0.05). Although dietary pectin inclusion did not significantly influence bacterial mass yield, reduced NH₃-N in the effluent and increased NAN flow (P$lt;0.01) was observed. Fiber digestibility trended to increase with inclusion of pectin. Second experiment was conducted to investigate the effects of soluble carbohydrate sources on ruminal fermentation and microbial growth. The treatments were beet pulp (BP). apple pomace (AP) and citrus pulp (CP) and each of them was incorporated at 10% level into the diet. (as fed base) and formulated to be isonitrogenous with urea. BP was lower than AP and CP in pectin content. Although there were no significant differences in ruminal fermentation characteristics. ruminal pH was lower in AP and CP than BP (P$gt;0.05). Ruminal NHS N concentration was highest in CP among the treatments. Bacterial mass yield and NAN flow were higher in AP and CP than those of BP. Fiber digestibility was not significantly different among treatments, but was higher in AP and CP than that of BP (P$gt;0.05). Overall. ruminal microbes efficiently captured NH₃-N which was produced from degradation of protein using dietary soluble carbohydrate, and also increased NAN flow.
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