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KMID : 1025520010430050707
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Journal of Animal Science and Technology
2001 Volume.43 No. 5 p.707 ~ p.720
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Effect of Yucca Extract on In Vitro Fermentation by Mixed Ruminal Microorganism
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황일환/Hwang, I. H.
이상석/Chalermglin, Piya/홍승희/최유지/하종규/Lee, Sang S./Hong, S. H./Choi, Y. J./Ha, Jong K.
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Abstract
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An in vitro experiment with mixed ruminal microorganism was conducted to investigate the effects of Yucca extract(YE) and substrate on medium pH, gas production, number of bacteria and protozoa, enzymatic activities, and VFA at different incubation times. The factorial design consisted of 2 main factors(substrates: 1㎜ ground straw and 4mm cracked corn) with 3 minor factors(YE levels: 0, 30 and 90 ㎎) in 5 incubation times(0, 12, 24, 48 and 72 hr). All incubations were repeated three times. The supplementation of YE generally reduced gas production, ammonia concentration, the number of bacteria and protozoa and DM digestion with minor effect on medium pH and VFA production. Compared to rice straw as a substrate, corn produced more gas, decreased medium pH. increased bacterial numbers, and was more digestible. Current results indicate that YE has direct and indirect effect on the types and numbers of ruminal microbes and hence on ruminal fermentation
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