Characterization of GFRα‐1‐Positive and GFRα‐1‐Negative Spermatogonia in Neonatal Pig Testis     

KH Lee  WY Lee  JH Kim  MJ Yoon  NH Kim  JH Kim  SJ Uhm  DH Kim  HJ Chung  H Song 《Reproduction in domestic animals》2013,48(6):954-960

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Effects of Gonadotropins on In Vitro Maturation and of Electrical Stimulation on Parthenogenesis of Canine Oocytes     

BS Kim  SR Lee  BH Hyun  MJ Shin  DH Yoo  S Lee  YS Park  JH Ha  ZY Ryoo 《Reproduction in domestic animals》2010,45(1):13-18

The objective of this study was to determine the effects of gonadotropins on in vitro maturation (IVM) and electrical stimulation on the parthenogenesis of canine oocytes. In experiment I, cumulus oocyte complexes were collected from ovaries at a random phase of the oestrus cycle and cultured on maturation medium treated with hCG or eCG for 48 or 72 h. There were no significant differences in the effects on the metaphase II (MII) rate between the hCG and eCG treatment groups over 48 h (5.4% vs 5.5%). The MII rate in the co-treatment group of hCG and eCG for 48 h was higher than in each hormone treated group (15.5%, p < 0.05). In experiment 2, the parthenogenetic effect on oocyte development, at various electrical field strengths (1.0, 1.5, 2.0 kV/cm DC) for 60 or 80 μs with a single DC pulse after IVM on the co-treatment of hCG and eCG, was examined. The rate of pronuclear formation (37.1%) in electrical activation at 1.5 kV/60 μs without cytochalasin B (CB) was higher than that of oocytes activated in the other groups (p < 0.05). However, we did not observe the cleavage stages. Also, CB did not influence parthenogenesis of canine oocytes. The results showed that the pronucleus formation rate, indicative of the parthenogenesis start point, could be increased by electrical stimulation. Therefore, these results can provide important data for the parthenogenesis of canine oocytes and suggest the probability of parthenogenesis in canines.  相似文献   

Memory and hibernation in Citellus lateralis     

M C McNamara  M L Riedesel 《Science (New York, N.Y.)》1973,179(68):92-94

Squirrels learned to escape from a water bath by making a visual discrimination. Twenty-four hours after reaching criterion for learned behavior, the animals were exposed to the first of two 11-day cold exposures. The animals that hibernated had better retention of the learned behavior.  相似文献   

Cardiovascular dynamics of surgically prepared pulmonary stenosis     

F B Hembrough  D H Riedesel  R L Engen 《American journal of veterinary research》1971,32(5):793-801

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Oral administration of different formulations of ascorbic acid to the horse     

DH Snow BSc BVSc  PhD  MROVS  M Frigg PhD 《Journal of Equine Veterinary Science》1989,9(1)

The absorption of crystalline ascorbic acid, ascorbyl palmitate, ascorbyl stearate and a formulation of ascorbic acid was investigated in six mature Thoroughbred horses following oral administration. It was found that ascorbyl palmitate gave both highest plasma concentrations and greatest area under the curve (AUC) for ascorbic acid. Least variation between animals also occured for this preparation. No apparent absorption was seen in some animals given ascorbic acid or ascorbyl stearate.  相似文献   

实蝇检疫防治措施的絷水处理对芒果品质和腐烂的影响     

Spal.  DH 《热带农业科技》1989,12(4):38-41

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CIRCUMAORTIC CYSTERNA CHYLI LIGATION     

D. L. Rigg  E. A. Riedesel 《Veterinary radiology & ultrasound》1985,26(2):70-72

Abdominal and thoracic lymphangiograms were done on seven dogs by cannulation of a mesenteric lymphatic. Dissection and ligation of the cysterna chyli were attempted in two dogs with poor success. Obstruction of thoracic duct flow by circumaortic ligation of the cysterna chyli was attempted in the remaining five dogs. Repeated contrast studies were done immediately following ligation and again after one to seven weeks. The dogs were killed, and postmortem examinations were done immediately after the third lymphangiogram. The circumaortic ligation was effective in all cases as judged by the immediate follow-up study, however, in three of the subsequent follow-up studies, thoracic duct flow had returned through recanalization past the ligature.  相似文献   

The use of intraluminal stents for tracheal collapse in two horses: Case management and long‐term treatment     

D. M. Wong  B. A. Sponseller  E. A. Riedesel  L. L. Couëtil  K. Kersh 《Equine Veterinary Education》2008,20(2):80-90

Tracheal collapse is an uncommon clinical disorder in horses but when present can be difficult to correct. Various medical and surgical procedures to correct tracheal collapse have been described in horses with variable success. Recently, the use of an intraluminal stent has been described as a treatment for tracheal collapse in a miniature horse. The long‐term management, utilising intraluminal stents, in 2 miniature horses with tracheal collapse is presented here. In particular, various complications as a result of intraluminal stent placement are described, the most persistent being the formation of granulation tissue at various regions of the stents. Multiple methods of combating granulation tissue in this situation also are discussed.  相似文献   

Workplace bullying and relationships with health and performance among a sample of New Zealand veterinarians     

DH Gardner  W Rasmussen 《New Zealand veterinary journal》2018,66(2):57-63

AIM: To examine the relationships between workplace bullying, destructive leadership and team conflict, and physical health, strain, self-reported performance and intentions to quit among veterinarians in New Zealand, and how these relationships could be moderated by psychological capital and perceived organisational support.

METHODS: Data were collected by means of an online survey, distributed to members of the New Zealand Veterinary Association. Participation was voluntary and all responses were anonymous and confidential. Scores for the variables measured were based on responses to questions or statements with responses categorised on a linear scale. A series of regression analyses were used to assess mediation or moderation by intermediate variables on the relationships between predictor variables and dependent variables.

RESULTS: Completed surveys were provided by 197 veterinarians, of which 32 (16.2%) had been bullied at work, i.e. they had experienced two or more negative acts at least weekly over the previous 6 months, and nine (4.6%) had experienced cyber-bullying. Mean scores for workplace bullying were higher for female than male respondents, and for non-managers than managers (p<0.01). Scores for workplace bullying were positively associated with scores for destructive leadership and team conflict, physical health, strain, and intentions to quit (p<0.001). Workplace bullying and team conflict mediated the relationship between destructive leadership and strain, physical health and intentions to quit. Perceived organisational support moderated the effects of workplace bullying on strain and self-reported job performance (p<0.05).

CONCLUSIONS: Relatively high rates of negative behaviour were reported by veterinarians in this study, with 16% of participants meeting an established criterion for having been bullied. The negative effects of destructive leadership on strain, physical health and intentions to quit were mediated by team conflict and workplace bullying. It should be noted that the findings of this study were based on a survey of self-selected participants and the findings may not represent the wider population of New Zealand veterinarians.  相似文献   

Quantitative and thematic analysis of complaints by clients against clinical veterinary practitioners in New Zealand     

SJG Gordon  DH Gardner  JF Weston  CF Bolwell  J Benschop  TJ Parkinson 《New Zealand veterinary journal》2019,67(3):117-125

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