Hwang, I.H.
(School of Agricultural Biotechnology, Seoul National University)
,
Kim, H.D.
(School of Agricultural Biotechnology, Seoul National University)
,
Shim, S.S.
(School of Agricultural Biotechnology, Seoul National University)
,
Lee, Sang S.
(School of Agricultural Biotechnology, Seoul National University)
,
Ha, J.K.
(School of Agricultural Biotechnology, Seoul National University)
This experiment was conducted to evaluate the effects of supplemental unsaturated fatty acids (UFA) on fermentation characteristics, especially on gas production, cellulose degradation and volatile fatty acid (VFA) concentration by mixed ruminal microorganisms. In order to attain this objective, uns...
This experiment was conducted to evaluate the effects of supplemental unsaturated fatty acids (UFA) on fermentation characteristics, especially on gas production, cellulose degradation and volatile fatty acid (VFA) concentration by mixed ruminal microorganisms. In order to attain this objective, unsaturated fatty acids including oleic acid (C 18:1), linoleic acid (C18:2) and arachidonic acid (C22:4) were added at varying level. Mixed ruminal microbes used in this experiment were obtained from the rumen of a cannulated Holstein cow. Medium pH values after 7 d incubation were significantly affected by type and level of unsaturated fatty acids (p<0.01). All of UFA inhibited total gas production, and especially treatment of arachidonic acid at the levels of 0.01% gave the lowest gas. production after 7 d incubation (p<0.01). Comparison of the population of protozoa revealed that UFA did not have any significant effect on the total protozoa number. The addition of UFA did not effect dry matter degradation. Volatile fatty acid (VFA) composition of the culture was influenced little by UFA, although the considerable amount of iso-type VFA were detected in UFA supplemented incubations. The ratio of acetic acids to propionic acids, however, was lower than control in all the treatments after 7 d incubation (p<0.01).
This experiment was conducted to evaluate the effects of supplemental unsaturated fatty acids (UFA) on fermentation characteristics, especially on gas production, cellulose degradation and volatile fatty acid (VFA) concentration by mixed ruminal microorganisms. In order to attain this objective, unsaturated fatty acids including oleic acid (C 18:1), linoleic acid (C18:2) and arachidonic acid (C22:4) were added at varying level. Mixed ruminal microbes used in this experiment were obtained from the rumen of a cannulated Holstein cow. Medium pH values after 7 d incubation were significantly affected by type and level of unsaturated fatty acids (p<0.01). All of UFA inhibited total gas production, and especially treatment of arachidonic acid at the levels of 0.01% gave the lowest gas. production after 7 d incubation (p<0.01). Comparison of the population of protozoa revealed that UFA did not have any significant effect on the total protozoa number. The addition of UFA did not effect dry matter degradation. Volatile fatty acid (VFA) composition of the culture was influenced little by UFA, although the considerable amount of iso-type VFA were detected in UFA supplemented incubations. The ratio of acetic acids to propionic acids, however, was lower than control in all the treatments after 7 d incubation (p<0.01).
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문제 정의
Although relatively extensive research efforts have been made in the past to elucidate effects of fatty acids, studies reporting the effects on fermentation by isolated mixed rumen microbes are not easily found in the literature. Therefore, the objective of this experiment was to examine the effect of unsaturated fatty acids on fermentation characteristics, especially on gas production, cellulose degradation and VFA concentration by mixed rumen microbes.
데이터처리
The analyses of variance of all data from this experiment were accomplished with ANOVA procedure of SAS program. The linear and quadratic effects of variables according to incubation time were analyzed with regression procedure of SAS program (1985).
The analyses of variance of all data from this experiment were accomplished with ANOVA procedure of SAS program. The linear and quadratic effects of variables according to incubation time were analyzed with regression procedure of SAS program (1985).
이론/모형
VFA concentration was analyzed by the method of Erwin et al. (1961). Supernatant in an amount of 1.
후속연구
(1983), however, reported that the addition of linseed oil and coconut oil had no significant effects on DM degradation rate. Present results do not provide any clue, however, whether effects of unsaturated fatty acids on the DM digestibilities were due to the toxicity or other factors, which needs further investigation.
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