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النتائج 1 - 10 من 11
Time-course response of epichlorohydrin on epididymal histopathology in rats
2009
Kim, K.H., Chonnam National University, Gwangju, Republic of Korea | Shin, I.S., Chonnam National University, Gwangju, Republic of Korea | Lim, J.H., Chonnam National University, Gwangju, Republic of Korea | Kim, S.H., Chonnam National University, Gwangju, Republic of Korea | Park, N.H., Chonnam National University, Gwangju, Republic of Korea | Moon, C.J., Chonnam National University, Gwangju, Republic of Korea | Kim, S.H., Chonnam National University, Gwangju, Republic of Korea | Shin, D.H., Chonnam National University, Gwangju, Republic of Korea | Kim, J.C., Chonnam National University, Gwangju, Republic of Korea
This research aimed to investigate the time-course effect of epichlorohydrin (ECH) on epididymal histopathology in Sprague-Dawley rats. Twenty-four male rats were randomly assigned to four groups with 6 rats in each group and were administered a single oral dose of ECH (70 mg/kg) or its vehicle. Six animals each were sacrificed on days 0 (control), 1, 2, and 7 after treatment. During the study period, clinical signs, body weights, reproductive organ weights, testicular spermatid count, epididymal sperm count, motility and morphology, and histopathology were examined. No treatment-related effects on body weights and reproductive organ weights were noted at any time point. On the contrary, sperm motility decreased slightly on days 1 and 2 after treatment and then decreased significantly on day 7 after treatment. The first signs of histological changes were the appearance of cell debris in the ducts and vacuolization of the epithelial cells observed in the proximal caput epididymis on day 1 after treatment. The incidences and grades of the histological changes including cell debris in the ducts, epithelial vacuolization, oligospermia, and epithelial disruption increased on day 2 and then decreased slightly on day 7 after treatment. These results show that a single oral dose of 70 mg/kg ECH to male rats results in cell debris in the ducts and vacuolization of the epithelial cells in the proximal caput epididymis, followed by reversible oligospermia, epithelial disruption, and decreased sperm motility.
اظهر المزيد [+] اقل [-]Characteristic of bacterial flora from the uterus in HanWoo cattle
2014
Kim, K.J., angwon National University, Chuncheon, Republic of Kroea | Park, S.Y., angwon National University, Chuncheon, Republic of Kroea | Cho, Y.J., angwon National University, Chuncheon, Republic of Kroea | Jung, B.D., angwon National University, Chuncheon, Republic of Kroea | Park, J.J., Animal Reproduction and Biotechnology Center, Hoengseong, Republic of Korea | Hahn, T.W., angwon National University, Chuncheon, Republic of Kroea
Uterine sterilization is important for improving fertility in cattle. This study compared bacterial flora in the uterus between healthy and repeat breeder cows (RBCs). The uterine flushing of six heifers, 13 healthy HanWoo cows and eight RBCs (HanWoo) were sampled, and 15 frozen semen samples were selected. Overall, 35 bacteria were identified from in HanWoo uterine flushing and semen. The bacterial genera identified from HanWoo uterine flushing were Alloiococcus, Bacillus, Enterobacter, Enterococcus, Erysipelothrix, Gardnerella, Granulicatella, Kocuria, Pantoea, Pasteurella, Rothia, Serratia, Sphingomonas, Staphylococcus, Stenotrophomonas and Streptococcus. The bacterial genera identified from HanWoo semen were Bacillus, Escherichia, Kocuria, Oligella, Pseudomonas, Serratia, Sphingomonas, Staphylococcus, Stenotrophomonas and Streptococcus. The prevalence and presence of the identified bacteria between healthy cows and RBCs differed significantly. Further studies are needed to determine the role of these bacteria in the uterus of HanWoo cattle with reproductive disorder.
اظهر المزيد [+] اقل [-]Bacterial contaminants in extended boar semen and selection of effective antimicrobials
2010
Kim, H.Y., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Byun, J.W., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Shin, D.H., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Kim, H.S., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Yoon, H.C., National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Park, C.K., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Lee, O.S., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea | Jung, B.Y., Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Service, Anyang, Republic of Korea
Bacterial contamination is an unavoidable finding of the semen collection process in boar and can lead in deleterious effects on semen quality and longevity if left uncontrolled. The purpose of this study is to identify the bacteria in extended boar semen and to select the effective antimicrobials to control of the contaminants. Of 116 extended boar semen samples submitted from eight AI centers in Korea, 39 (33.6%) samples were positive for bacterial contamination. Among 39 contaminated semen, most of them (84.6%) were contaminated with one or two bacterial species and there was no significant difference between two age groups (less-than or equal to 24 and greater than 24 month old). Stenotrophomonas maltophilia (n=18) was the most predominant bacterium followed by Elizabethkingia meningoseptica (n=12), phingomonas paucimobilis (n=12), Myroides spp. (n=5), Ochrobactrum anthropi (n=3), and so on. Enrofloxacin (72.9%), florfenicol (72.9%), bacitracin (49.2%) and tylosin (49.2%) showed higher sensitivity compared with penicillin (13.6%) or aminoglycosides (6.8%-18.6%). Brucella spp., Leptospira spp., Mycoplasma hyopneumoniae, Mycoplasma hyorhinis, Mycobacterium tuberculosis complex were not detected in semen by PCR.
اظهر المزيد [+] اقل [-]Assessment of the fertilizing capacity of domestic animal spermatozoa by hamster test - (1) - Comparison of storage temperatures for boar sperm and results of hamster test between boar and dog sperm
1992
Kim, Y.J. (Chonbuk National University, Chonju (Korea Republic). College of Veterinary Medicine)
Study on functional elevations of sperm-host glands in domestic hens, 2; storage level of spermatozoa
1991
Kwak, S.D. (Gyeongsang National Univ., Chinju (Korea Republic). Coll. of Veterinary Medicine) | Ahn, D.W. (Gyeongnam Animal Health Experimental Institute, Chinju (Korea Republic))
Study on functional elevations of sperm-host glands in domestic hens, 1; Histochemical and electron microscopical observations
1991
Kwak, S.D. | Woo, H.C. | Choe, S.Y. (Gyeongsang National Univ., Chinju (Korea Republic). Coll. of Veterinary Medicine)
Studies on functional elevations of sperm-host glands in domestic hens, 3; Comparison of stored-spermatozoa levels in the utero-vaginal glands and the infundibular glands
1991
Kwak, S.D. (Gyeongsang National Univ., Chinju (Korea Republic). Coll. of Veterinary Medicine)
Appearance frequency of spematozoa bearing B-body in semen of Korean native bull and cells bearing F-body in mouse tissues
1993
Kwak, S.D. | Kang, W.H. | Park, S.S. (Gyeongsang National University, Chinju (Korea Republic). College of Veterinary Medicine)
RT-PCR and nested PCR amplification of the PRRSV genes from boar semen for the rapid and sensitive differential diagnosis
1998
Lyoo, Y.S. (Konkuk University, Seoul (Korea Republic). Veterinary Medicine) | Park, C.K. | Lee, C.H. (National Veterinary Research Institute, Anyang (Korea Republic))
Artificial insemination with frozen semen in the dog-Simple freezing method using methanol
1994
Kim, Y.J. | Park, Y.J. | Kim, B.J. | Yu, I.J. (Chonbuk National University, Chonju (Korea Republic). College of Veterinary Medicine)