• Korean Journal of Organic Agriculture
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• v.14 no.1
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• pp.97-108
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• 2006

These studies were conducted to evaluate the feasibility of spent bleaching clay (SBC) as a feed resource for ruminants. Three Holstein dairy cows, surgically fitted with ruminal cannula, were used in a $3{\times}3$ Latin Square design. Dietary treatments were 1) basal diet, 2) basal diet plus 2% of SBC and 3) basal diet plus 4% of SBC. Rumen fluid was sampled at 0, 3, 6, 9 and 12 hours following the start of the morning feeding. Nylon bags containing experimental diets were used to determine ruminal nutrient disappearance at 0, 3, 6, 12 and 24 hours. The values of ruminal pH in cows receiving 4% of SBC was lower than those of the control and 2% SBC supplement. The $NH_3-N$ concentration in the rumen was higher at the 3 hour than for cows of control and 2% of SBC supplement. Total VFA concentrations in the rumen were not affected by the addition of SBC. Dry matter and organic matter disappearance in the rumen was lower at the 6 hours than the control and 2% SBC treatment, but no difference at the end of the 24 hour.

• Journal of Life Science
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• v.28 no.10
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• pp.1244-1253
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• 2018

Rumen microbiome consists of a wide variety of microorganisms, such as bacteria, archaea, protozoa, fungi, and viruses, that are in a symbiotic relationship in a strict anaerobic environment in the rumen. These rumen microbiome, a vital maker, play a significant role in feed fermentation within the rumen and produce different volatile fatty acids (VFAs). VFAs are essential for energy metabolism and protein synthesis of the host animal, even though emission of methane gas after feed fermentation is considered a negative indicator of loss of dietary energy of the host animal. To improve rumen microbial efficiency, a variety of approaches, such as feed formulation, the addition of natural feed additives, dietary feed-microbes, etc., have taken to increase ruminant performance. Recently with the application of high-throughput sequencing or next-generation sequencing technologies, especially for metagenomics and metatranscriptomics of rumen microbiomes, our understanding of rumen microbial diversity and function has significantly increased. The metaproteome and metabolome provide deeper insights into the complicated microbial network of the rumen ecosystem and its response to different ruminant diets to improve efficiency in animal production. This review summarized some recent advances of rumen microbiome techniques, especially "meta-omics," viz. metagenomic, metatranscriptomic, metaproteomic, and metabolomic techniques to increase feed fermentation and utilization in ruminants.

• Journal of The Korean Society of Grassland and Forage Science
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• v.34 no.1
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• pp.60-67
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• 2014

The comparisons between cellulolytic bacteria adhesion on rice straw and fiber digestion in time course during rumen fermentation were studied in situ. The adhesions of cellulolytic bacteria, F. succinogenes. R. albus and R. flavefaciens, were measured by RT-PCR. When the rice straws were incubated at 0. 2, 4, 8, 12 and 24 hours of the in situ rumen, straw was degraded with increasing speed during the incubation and showed the highest disappearance increasing rate (DM g/h) from 8 to 12 hour. The adhesions of F. succinogenes, R. flavefaciens and R. albus were achieved above 80% in 1 hour of in situ rumen fermentation and then keep adhesive population up after the time of fermentation. When the in situ samples were collected at 0, 5, 10, 30 and 60 min to detect the early stages of adhesion on the rice straws ingested into rumen, the numberous adhesive colony of F. succinogenes, R. flavefaciens and R. albus were detected in 5 min. In case of rice straw treated with 0, 2, 4 and 8% NaOH, all of three cellulolytic bacteria showed the increasing trends of adhesion with increasing DM disappearance of rice straw by higher concentration of NaOH at 12 hour of in situ. However, there were showed respectively difference at 24 hour. The present results gave certain evidence that adhesion of cellulolytic bacteria is definitely achieved in early stage of roughage ingestion into rumen, their colony develop the stable communities on roughage in process of rumen fermentation and then fiber degradation is accelerated.

• The Journal of the Korea Contents Association
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• v.22 no.1
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• pp.535-544
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• 2022

This study identified the relationship between deliberate rumination of adults who experienced traumas and post-traumatic growth, and examined the mediating model of meaning of life moderated by trauma intensity on deliberate rumination and post-traumatic growth. Participants were 318 male and female adults who experienced traumas. The moderated mediating effect was analysed with PROCESS Macro 3.5 Model 7. Results revealed that deliberate rumination of adults who experienced traumas was positively correlated with trauma intensity, meaning of life, and post-traumatic growth, while meaning of life was positively correlated with post-traumatic growth. In a moderated mediating model for post-traumatic growth, there was significant interaction effect of deliberate rumination and trauma intensity; conditionally indirect effect of deliberate rumination was only significant for whose trauma intensity were high. These findings suggest that adults who did deliberate rumination are more likely to experience post-traumatic growth with finding meaning of life. And, the moderating effect suggests that this influence is only with higher levels of trauma intensity. In conclusion, deliberate rumination of severe traumatic event may lead to post-traumatic growth, and it can be helpful to experience the meaning of life in the process.

• Korean Deer Journal
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• no.24
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• pp.4-11
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• 1995

꽃사슴에 있어서 계절간 소화율의 차이와 사료의 통과속도와의 관계를 암사슴 4두를 공시하여 겨울과 여름에 각각 실시하였다. 사료의 통과속도는 Cr염색법을 이용하였고, 또한 비중별(0.91, 1.20, 1.55, 2.10g/ml) 통과속도의 차이를 규명하기 위하여 plastic particle(PP)를 이용하여 조사하였다. 건물, 유기물, 조단백질 그리고 NDF의 소화율은 겨울철보다 여름철이 높은 경향이었으나 유의적인 차이는 없었다(P>0.05). 그리고 분중의 경시적인 Cr 회수율과 누적회수율에서 계절간에 차이가 나타나지 않았다. 비중별 회수율에 있어서도 계절간의 차이는 나타나지 않았으나, 비중간의 차이는 유의성 있는 차이(P<0.05)를 보였다. 비중 0.90에서는 모든 사슴이 $6\%$의 미만의 낮은 회수율을 보였으나 1.20이상부터 회수율은 높아졌고, 비중 2.10의 PP는 $75\%$ 이상이 회수되었다. 그리나 비중 1.20과 1.55의 PP는 개체간 변이가 심하게 나타나 최대 $95.1\%$에서 최저$1.3\%$의 범위를 보였다. 반추에 의한 이빨자국을 기초로 반추율을 조사한 결과, 비중 0.90의 PP는 약 $70\%$ 반추율을 보였으나 비중 2.10의 PP는 $5\%$미만의 반추율을 나타내어 비중이 높을수록 반추되지 않고 보다 빨리 2-3위구를 통과하기 때문에 통과속도가 빨랐던 것으로 나타났다.

• Life and Agrochemicals
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• s.253
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• pp.16-23
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• 2009

특히 계절산업인 농약산업은 한 해의 기상에 절대적 영향을 받는다. 대풍을 일궈낸 올해 업계는 기상호조에 따른 병해충 발생 저조와 맹목적 친환경농법 확산 등으로 인한 약제소비 감소, 반복되는 재고 누적 등으로 한치 앞을 내다 볼 수 없는 실정이다. 이에 한국작물보호협회(회장 염병만)는 지난 11월 23일 "반추(反芻), 2009작물보호제 산업"이란 주제로 특집 '송년 좌담회'를 갖고 한 해를 반추, 매조지 하며 다음해를 구상해 보았다. 좌담회에는 협회 운영 4개 위원회 위원장 및 위원 1명 등 8명의 패널이 참여했다.

• Journal of Convergence for Information Technology
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• v.10 no.10
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• pp.88-99
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• 2020

This study aimed to explore the effects of perceived family stress, supportive resources, intentional rumination, and coping behaviors on posttraumatic growth of cancer survivors based on the Double ABCX Family Stress Model. Data were collected from 200 cancer survivors currently living with their spouses and analyzed by path analysis using AMOS program. The results of this study were as follows. First, perceived family stress of cancer survivors had direct effects on supportive resources, intentional rumination, and coping behaviors, and had indirect effects on posttraumatic growth mediated by supportive resources, intentional rumination, and coping behaviors. Second, supportive resources, intentional rumination, and coping behaviors had direct effects on posttraumatic growth. Third, supportive resources and intentional rumination had direct effects on coping behaviors and had an indirect effect on posttraumatic growth mediated by coping behaviors. The current study supported the applicability of the Double ABCX Family Stress Model to the posttraumatic growth process of cancer survivors.

• Korean Journal of Microbiology
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• v.43 no.2
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• pp.100-105
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• 2007

The objective of this study was to confirm biohydrogenation of linoleic acid and stearic acid production by mixed men fungi and bacteria. In mixed fungal biohydrogenation study, when linoleic acid solution was added to fungal culture (after 24 hr pre-incubation), all linoleic acids were converted to trans-11 vaccenic acid via cis-9, trans-11 conjugated linoleic acid production within 24 hr period of incubation. All linoleic acid solution was hydrogenated to trans-11 vaccenic acid within 24 hr incubation and this was continued until the end of incubation (48 hr). Both treatments (added linoleic acid solution or the same amount of solution without containing linoleic acid into fungal cultures) produced the similar amount of stearic acid. In contrast, 100% of linoleic acid solution was hydrogenated to stearic acid in mixed bacterial culture. It is concluded that the end product of mixed fungal biohydrogenation of linoleic acid is trans-11 vaccenic acid whereas mixed bacteria produced stearic acid as an end product of their biohydrogenation.

• Journal of The Korean Society of Grassland and Forage Science
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• v.31 no.2
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• pp.191-200
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• 2011

Four ruminally cannulated Hanwoo steers (BW 600 ${\pm}$ 48.4 kg) fed whole crop rice silage (WRS) as forage were used to investigate the effects of its dietary on rumen fermentation and blood metabolites at different harvesting time such as milk, dough, yellow ripe and mature stages of WRS, respectively. Mean ruminal pH sampled at 0, 1, 2, 4, 6 and 8 h after the morning feeding was not significantly (p>0.05) different between the WRS by the harvesting time. In diurnal pattern in ruminal pH, the lowest pH for the mature stage treatment (Mature) appeared at 6 h after the feeding while it appeared at 2-4 h for the other treatments. This may indicate that retention time in the rumen of Hanwoo fed WRS harvested at the Mature increased. Although feeding WRS harvested at different stages did not significantly (p>0.05) affect ruminal ammonia N concentration, the ammonia N for WRS harvested at the milk stage (Milk) tended (p=0.11) to decrease compared with that for the yellow stage treatment (Yellow). In the blood metabolites analysis, BUN concentration for Yellow numerically decreased compared with that for Milk. This, taking lower concentration of ruminal ammonia N for Milk than the other treatments into account, clearly indicates that the BUN concentrations may not increase in proportion to ruminal ammonia N concentration according to ammonia N concentration entering into the lower gastric tracts. Lower (p=0.03) concentration of blood albumin for the dough stage treatment than that for Mature may indicate high protein synthesis in Hanwoo fed WRS at the dough stage, but further studies in terms of mechanism of nutrients distribution should be required. Present results indicate that different harvesting time did not affect rumen fermentation and blood metabolites in Hanwoo. Thus, based on the results of the present and the previous studies, utilizing WRS harvested at yellow stage could be recommendable for Hanwoo steers.

• Journal of Animal Science and Technology
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• v.46 no.1
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• pp.49-54
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• 2004

Effects of low quality roughage sources on duration and frequencies of rumination and chewing in Hanwoo steers were determined, Animals were fed three diets; concentrate+rice straw(SO:SO), concentrate+ rice straw + popped rice hull(SO:3S: IS) and concentrate+ rice straw+ground rice hull(SO:3S: IS) to compare both rice straw alone and combination with rice hull. Eating and ruminating time of steers fed concentrate+ rice straw(SO:50), concentrate+ rice straw + popped rice hull(50:35:15) and concentrate + rice straw + ground rice hull(50:3S:15) were 78.8 and 338.4minlday; 98.0 and 362.5minlday, and 160 and 519.2min/day, respectively. When steers were fed popped rice hull and ground rice hull, time spent for both eating and ruminating was significantly increased(p <0.05). When steers fed popped and ground rice hull, number of ruminating chews and number of chews per rumination time were significantly decreased(p<0.05). The number of rumination boli and boli per rumination time had significantly decreased(p<0.05), but chewing time per boli, number of chew'S per bolus were significantly increased(p