P Christensen

Summary

Affiliation: The Royal Veterinary and Agricultural University
Country: Denmark

Publications

  1. ncbi A flow cytometric method for rapid determination of sperm concentration and viability in mammalian and avian semen
    Preben Christensen
    Department of Production Animals and Horses, Section for Reproduction, Royal Veterinary and Agricultural University, Frederiksberg, Denmark
    J Androl 25:255-64. 2004
  2. ncbi Discrepancies in the determination of sperm concentration using Bürker-Türk, Thoma and Makler counting chambers
    P Christensen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Royal Veterinary and Agricultural University, 1870 Frederiksberg C, Denmark
    Theriogenology 63:992-1003. 2005
  3. ncbi Relationship between sperm viability as determined by flow cytometry and nonreturn rate of dairy bulls
    Preben Christensen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    J Androl 26:98-106. 2005
  4. ncbi Implementation of flow cytometry for quality control in four Danish bull studs
    P Christensen
    Department of Large Animal Sciences, Veterinary Reporduction and Obstetrics, The Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    Anim Reprod Sci 85:201-8. 2005
  5. ncbi Quality control in boar semen production by use of the FACSCount AF system
    Preben Christensen
    Section for Reproduction, Department of Large Animal Sciences, Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    Theriogenology 62:1218-28. 2004
  6. ncbi Relationship among seminal quality measures and field fertility of young dairy bulls using low-dose inseminations
    P Christensen
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, DK 1870 Frederiksberg, Denmark
    J Dairy Sci 94:1744-54. 2011
  7. ncbi Validation of the FACSCount AF system for determination of sperm concentration in boar semen
    C Hansen
    Department of Clinical Studies, Section for Reproduction, Royal Veterinary and Agricultural University, Frederiksberg, Denmark
    Reprod Domest Anim 37:330-4. 2002
  8. ncbi In vitro induction of the acrosome reaction in bull sperm and the relationship to field fertility using low-dose inseminations
    A Birck
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Frederiksberg, Denmark
    Theriogenology 73:1180-91. 2010
  9. ncbi Sperm chromatin structure integrity in liquid stored boar semen and its relationships with field fertility
    G B Boe-Hansen
    Section for Veterinary Reproduction and Obstetrics, Department of Large Animal Sciences, Faculty of Life Sciences, University of Copenhagen, Dyrlaegevej 68, 1870 Frederiksberg, Denmark
    Theriogenology 69:728-36. 2008
  10. ncbi Dynamics of the induced acrosome reaction in boar sperm evaluated by flow cytometry
    Anders Birck
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Frederiksberg, Denmark
    Anim Reprod Sci 115:124-36. 2009

Collaborators

Detail Information

Publications17

  1. ncbi A flow cytometric method for rapid determination of sperm concentration and viability in mammalian and avian semen
    Preben Christensen
    Department of Production Animals and Horses, Section for Reproduction, Royal Veterinary and Agricultural University, Frederiksberg, Denmark
    J Androl 25:255-64. 2004
    ..In addition, the FACSCount AF flow cytometer determined both sperm concentration (coefficient of variation 3.3%) and sperm viability (coefficient of variation 0.7%) with high precision...
  2. ncbi Discrepancies in the determination of sperm concentration using Bürker-Türk, Thoma and Makler counting chambers
    P Christensen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Royal Veterinary and Agricultural University, 1870 Frederiksberg C, Denmark
    Theriogenology 63:992-1003. 2005
    ..It is concluded that duplicate counts by at least two technicians is recommended to achieve high precision but, that particular caution should be exerted with regard to the precision and accuracy of the used counting device...
  3. ncbi Relationship between sperm viability as determined by flow cytometry and nonreturn rate of dairy bulls
    Preben Christensen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    J Androl 26:98-106. 2005
    ..Flow cytometric results for 1 extender (Biociphos Plus) indicated poorer sperm survival during postthaw incubation compared with Triladyl extender with whole and with clarified egg yolk...
  4. ncbi Implementation of flow cytometry for quality control in four Danish bull studs
    P Christensen
    Department of Large Animal Sciences, Veterinary Reporduction and Obstetrics, The Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    Anim Reprod Sci 85:201-8. 2005
    ..It is concluded that flow cytometric determination of sperm concentration and viability can be used to improve semen assessment by AI studs and result in a better quality control...
  5. ncbi Quality control in boar semen production by use of the FACSCount AF system
    Preben Christensen
    Section for Reproduction, Department of Large Animal Sciences, Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    Theriogenology 62:1218-28. 2004
    ..It is concluded that the FACSCount AF flow cytometer is a strong tool for improvement of the quality control in artificial insemination (AI) centres...
  6. ncbi Relationship among seminal quality measures and field fertility of young dairy bulls using low-dose inseminations
    P Christensen
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, DK 1870 Frederiksberg, Denmark
    J Dairy Sci 94:1744-54. 2011
    ....
  7. ncbi Validation of the FACSCount AF system for determination of sperm concentration in boar semen
    C Hansen
    Department of Clinical Studies, Section for Reproduction, Royal Veterinary and Agricultural University, Frederiksberg, Denmark
    Reprod Domest Anim 37:330-4. 2002
    ....
  8. ncbi In vitro induction of the acrosome reaction in bull sperm and the relationship to field fertility using low-dose inseminations
    A Birck
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Frederiksberg, Denmark
    Theriogenology 73:1180-91. 2010
    ..The current results therefore indicate that this sperm parameter is important in the field and also may play a role in the IVF laboratory...
  9. ncbi Sperm chromatin structure integrity in liquid stored boar semen and its relationships with field fertility
    G B Boe-Hansen
    Section for Veterinary Reproduction and Obstetrics, Department of Large Animal Sciences, Faculty of Life Sciences, University of Copenhagen, Dyrlaegevej 68, 1870 Frederiksberg, Denmark
    Theriogenology 69:728-36. 2008
    ..In conclusion the SCSA technique appears to be able to identify individuals with lower fertility with respect to litter size, and could in the future be implemented by the pig industry after a cost-benefit analysis...
  10. ncbi Dynamics of the induced acrosome reaction in boar sperm evaluated by flow cytometry
    Anders Birck
    Copenhagen University, Faculty of Life Sciences, Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, Frederiksberg, Denmark
    Anim Reprod Sci 115:124-36. 2009
    ..The results lead to suggestions for an optimized AR induction protocol that takes both sperm viability and the effectiveness of AR induction into consideration...
  11. ncbi The sperm chromatin structure assay as a diagnostic tool in the human fertility clinic
    Gry Brandt Boe-Hansen
    Department of Large Animal Sciences, Section for Veterinary Reproduction and Obstetrics, The Royal Veterinary and Agricultural University, Frederiksberg C, Denmark
    Hum Reprod 21:1576-82. 2006
    ..The objective was to evaluate the sperm chromatin structure assay (SCSA) as a diagnostic tool in clinical practice for intrauterine insemination (IUI), in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) treatments...
  12. ncbi Variability and laboratory factors affecting the sperm chromatin structure assay in human semen
    Gry B Boe-Hansen
    The Royal Veterinary and Agricultural University, Department of Large Animal Sciences, Section for Veterinary Reproduction and Obstetrics, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    J Androl 26:360-8. 2005
    ..Precise protocol description and standardization of the SCSA are therefore essential to achieve high agreement within and between different laboratories...
  13. ncbi Increasing storage time of extended boar semen reduces sperm DNA integrity
    Gry B Boe-Hansen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, The Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Denmark
    Theriogenology 63:2006-19. 2005
    ..001) was detected. In conclusion, the SCSA cytogram patterns were consistent for different ejaculates within boars and storage of extended boar semen at 18 degrees C for 72 h significantly decreased the integrity of sperm DNA...
  14. ncbi DNA integrity in sexed bull sperm assessed by neutral Comet assay and sperm chromatin structure assay
    Gry B Boe-Hansen
    Department of Large Animal Sciences, Veterinary Reproduction and Obstetrics, The Royal Veterinary and Agricultural University, Dyrlaegevej 68, 1870 Frederiksberg C, Copenhagen, Denmark
    Theriogenology 63:1789-802. 2005
    ..In the future assessment of sperm DNA integrity may be used to select bulls for sperm sex sorting and optimizing sperm sex sorting procedures...
  15. ncbi Tachykinins mediate changes in ion transport in porcine jejunum through release of prostaglandins and neurotransmitters
    J E Thorbøll
    Department of Anatomy and Physiology, The Royal Veterinary and Agricultural University, Frederiksberg, Denmark
    Regul Pept 77:105-11. 1998
    ..These results indicate, that SP and NKA regulate ion transport in porcine jejunum, entirely through the release of prostaglandins and enteric neurotransmitters...
  16. ncbi Endocrine disrupting compounds: effect of octylphenol on reproduction over three generations
    I B Bøgh
    Department of Clinical Studies, Section for Reproduction, Royal Veterinary and Agricultural University, 68 Dyrlaegevej, 1870 Frederiksberg C, Denmark
    Theriogenology 55:131-50. 2001
    ..Furthermore, possible consequences of exposure to endocrine disrupting compounds for the embryo transfer industry are addressed...
  17. ncbi Effects of indomethacin on Salmonella typhimurium- and cholera toxin-induced fluid accumulation in the porcine small intestine
    M A Unmack
    Department of Anatomy and Physiology, Royal Veterinary and Agricultural University, , DK-1870 Frederiksberg C, Denmark
    J Vet Med A Physiol Pathol Clin Med 48:153-63. 2001
    ..These results indicate that the porcine jejunal secretory response to ST and CT does not involve prostaglandins although indomethacin has an influence on the luminal release of PGE2 but not of 5-HT...