본 연구는 돼지 정자의 동결 건조 시 동결 보호제인 trehalose의 효과와 동결 건조 시간과 동결 건조 후 저장 기간에 따라 정자의 생존성과 체외 성숙 난자 내 동결 건조 정자를 직접 주입한 후 전핵 형성율, 난할율 그리고 배발달 성적을 조사하였다. 동결 건조 후 정자의 생존율은 trehalose 무첨가구에 비해 trehalose를 첨가한 처리구에서 높은 생존율을 보였으며, 75 mM의 trehalose를 첨가하여 동결 건조한 정자들의 생존율이 가장 높은 것으로 나타났다. 또한, 동결 건조 후 저장 기간이 길어질수록 생존율이 낮아지는 경향이었다. 체외 성숙 난자 내 동결 건조 정자를 직접 주입 후 전핵 형성율은 trehalose 첨가구에서 유의적으로 높았으며(p<0.05), 난할율과 배발달 성적도 trehalose 첨가구에서 유의적으로 높았고(p<0.05), 정자의 동결 건조 시간이 짧을수록 높은 난할율과 배발달율을 보였다.

The objective of this study was to compare the accuracy analysis and the effect of field application of a newly developed automatic heat detector in dairy cows. From 2009 to 2010, we used 48 Holstein cows (mounting cows : 38 heads, standing cows : 10 heads) raised in experimental barn of National Livestock Research Institute (RDA) for the accuracy analysis of automatic heat detector, and 14 Holstein cows raised in three commercial dairy farms of Cheonan and Pochun area for comparison of the effect of field application. The accuracy of response in cows attached with automatic heat detector was 86.8% (33/38) displayed on board when mounting activity observed, and 100% (10/10) when standing activity observed, and on average, 90.0% (43/48) displayed on board. The accuracy of automatic heat detector in on-farm test was 85.7% (12/14), and conception rate was 75.0% (9/12).

This study was carried out between 2008 and 2009 in four dairy farms to investigate the effect of feeding of whole crop barley silage on the reproductive performance of Holstein heifers. Two diets, mixed hay or whole crop barley silage separately from concentrate were fed 6-month old Holstein heifers (=37). In control group (=CON), heifers (n=16) were fed 6 kg (/head) mixed hay and 4 kg (/head) commercial diet. In whole crop barley silage group (=WBS), heifers (n=21) were fed 10 kg (/head) whole crop barley silage, 4 kg (/head) mixed hay and 2 kg (/head) commercial diet. To manage body weight gain, the body condition score of heifers were measured every month. The results obtained were as follows: 1. Body weight in CON and WBS heifers at 13-, 14-, 15- and 17-month old were 340±17.9 and 342±13.6 kg, 356±15.7 and 366±14.7 kg, 382±13.1 and 387±14.4 kg, and 429±15.0 and 417±10.3 kg, respectively. 2. Body condition score in CON and WBS heifers at 9-, 12-, 15- and 17-month old were 2.88±0.04 and 2.80±0.04, 2.88±0.04 and 2.80±0.04, 2.89±0.08 and 3.00±0.07, and 2.89±0.08 and 3.00±0.07, respectively. 3. Average age of sexual maturity in CON and WBS heifers were 437.3±9.9days and 939.6±12.5days, WBS group heifers were significantly shorter (p<0.05) than CON group heifers. 4. First-service conception rates in CON or WBS group were 81.3% (13/16) and 66.7% (14/21), respectively, and cumulative conception rate to 2nd artificial insemination were 87.5% for CON and 85.7% for WBS group. Conception rate was not different between treatments

s study was carried out between November 2008 and October 2009 in the experimental farm of Chunnam National University to investigate the effect of feeding of Sudangrass silage on the reproductive performance of Hanwoo cows. Two diets, rice straw or Sudangrass silage separately from concentrate were fed 19 Hanwoo cows. In control group (=CON), cows (n=9) were fed 5 kg (/head) rice straw and 3 kg (/head) commercial diet. In Sudangrass silage group (=SGS), cows (n=10) were fed 12.5 kg (/head) Sudangrass silage and 1 kg (/head) commercial diet. 1. Days to post-partum insemination were 78.8±25.3 days for CON and 84.7±24.6 days for SGS group and days to post-partum conception in CON or SGS were 90.1±24.1 and 87.7±26.8 days, respectively. 2. Post-partum conception rates for first service in CON or SGS was 66.7% and 90.0%, respectively, and caving interval was 375.1±46.7 days for CON and 370.2±34.4 days for SGS group. 3. Body Condition Scores of Hanwoo cows at artificial insemination was 5.36 for CON group and 4.93 for SGS group.

This study was carried out between November 2007 and October 2008 in the experimental farm of Chunnam National University to investigate the effect of feeding of whole crop barley silage on the reproductive performance of Hanwoo heifers and cows. Two diets, rice straw or whole crop barley silage separately from concentrate were fed 11 Hanwoo heifers and 26 Hanwoo cows. In control group (=CON), heifers (n=6) and cows (n=13) were fed 7 kg (/head) rice straw and 4 kg (/head) commercial diet. In whole crop barley silage group (=WBG), heifers (n=5) and cows (n=13) were fed 8 kg (/head) whole crop barley silage and 1 kg (/head) commercial diet. 1. Conception rates for first service in CON or WBG heifers were 66.7% (4/6) and 60.0% (3/5), respectively, and the services per conception cows were 1.5±0.2 for CON and 1.4±0.2 for WBG group. 2. Days to post-partum insemination were 106.6±26.3 days for CON and 85.6±12.6 days for WBG group, and days to post-partum conception in CON or WBG were 128.4±27.1 and 96.8±16.8 days, respectively. 3. Post-partum conception rates for first service in CON or WBG were 76.9% (10/13) and 84.6% (11/13), respectively, and caving interval was 418.1±50.7 days for CON and 392.8±20.7 days for WBG group.

본 연구는 山地草地에 있어서 사경方向과 海技標高가 牧草의 乾物生塵量과 品質에 미치는 影響을 究明 하고자 1986년부터 1987년까지 2년간 수행되었다. 1. 山地草地에 있어서 順料方向에 의한 orchardgrass의 乾物生塵量과 租蛋白質 含量은 北料面아 南料面보다 높았고, 南北 t 兩料面 모두 標高가 높아짐에 따라서 乾物生塵量과 組蛋白質 含量이 增加하였다. 2. Neutral detergent fiber(NDF), acid detergent fiber(

In this study, we found that the glycoprotein (18 kDa) isolated from Lactobacillus plantarum L67 (L67 protein) inhibits allergy-related inflammatory mediators in BPA treated rat basophilic leukemia 2H3 (RBL-2H3) cells and primary cultured splenocytes. First, we measured the levels of ERK, p38, and AP-1 by Western blotting and we evaluated the expression of IL-1β, IL-6, and IL-10 cytokines by real-time quantitative PCR. Finally, we evaluated the applicability of L. plantarum L67 as a yogurt starter culture by measuring pH, enumeration of bacteria, and sensory scores. The results of this study shows that L67 protein inhibits the phosphorylation of ERK and p38 MAPK, as well as the activation of AP-1 (c-Fos and c-Jun). With inflammationrelated factors (Th2-related cytokines), L67 protein inhibits BPA-induced IL-1β, IL-6, and IL-10 activity. Bisphenol A stimulates MAPK signaling, which induces increased GATA-3 expression, and GATA-3 induces the differentiation of Th2 cells and secretion of Th2-related cytokines. Our findings showed that L67 protein may regulate the activation of GATA3 and T-bet through the induction of MAPK signaling, and it relieves the Th1/Th2 cytokine profile imbalance. Taken together, these findings demonstrate that the L. plantarum L67 strain is a potential food supplement and starter culture, that could help in the prevention of Th2-related immune disorders.

The definitions of international authorized probiotics are live microorganisms that, when administered in adequate amounts, confer a health benefit on the host. The scientific basis for the prevention and treatment of bowel disease among the functions of probiotics has only recently been established. Probiotics, which are actively studied, are lactic acid bacteria, especially Lactobacillus and Bifidobacterium species. The C. difficile toxin is controlled by quorum sensing, which causes intestinal disease and other gastrointestinal disorders, leading to antibiotic-associated diarrhea. The use of probiotics for prevention and treatment has been discussed in this review.

Intestinal lactic acid bacteria (LAB) for humans are closely associated to the host’s health because the presenceof LAB is an important bio-defense factor in preventing colonization and subsequent proliferation of pathogenic bacteria inthe intestine. Some probiotics such as Lactobacillus species can intoxication of carcinogens including chemical mutagens.The purpose of this study was to compare the ability of antimutagenesity among 24 strains of LAB isolated from infantfeces, yogurt and kimchi etc. The antimutagenic effects of protein fractions extracted from the cells of 24 LAB strains wereinvestigated using mutagens as 4-nitroquinoline-N'-oxide in Ames test (Salmonella Typhimurium TA 100). In the Amestest, dose-dependent activity was exhibited significantly against 4NQO. Three strains of Lactobacillus showed the highestanti-4NQO activitiy (62.1%) among the tested strains of LAB.