S D Johnston

Summary

Affiliation: University of Queensland
Country: Australia

Publications

  1. ncbi Testosterone secretion, testicular histology and the cryopreservation of cauda epididymidal spermatozoa in the common ringtail possum (Pseudocheirus peregrinus)
    D J Phillips
    School of Animal Studies, The University of Queensland, Gatton, QLD 4343, Australia
    Reprod Fertil Dev 20:391-401. 2008
  2. ncbi The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z
    Willem Rens
    Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 OES, UK
    Genome Biol 8:R243. 2007
  3. ncbi An investigation into the similarities and differences governing the cryopreservation success of koala (Phascolarctos cinereus: goldfuss) and common wombat (Vombatus ursinus: shaw) spermatozoa
    S D Johnston
    School of Animal Studies, University of Queensland, Gatton 4343, Australia
    Cryobiology 53:218-28. 2006
  4. ncbi Studies of male reproduction in captive African wild dogs (Lycaon pictus)
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton 4343, Australia
    Anim Reprod Sci 100:338-55. 2007
  5. ncbi One-sided ejaculation of echidna sperm bundles
    S D Johnston
    School of Animal Studies, University of Queensland, Gatton, Queensland 4343, Australia
    Am Nat 170:E162-4. 2007
  6. ncbi The development of a testosterone stimulation test in the Virginia opossum (Didelphis virginiana) and its use in evaluating deslorelin contraception
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, Queensland 4343, Australia
    Reprod Fertil Dev 20:563-9. 2008
  7. ncbi Assessment of reproductive status in male echidnas
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 97:114-27. 2007
  8. ncbi Non-invasive methods of oestrus detection in captive southern hairy-nosed wombats (Lasiorhinus latifrons)
    L A Hogan
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 119:293-304. 2010
  9. ncbi Osmotic stress and cryoinjury of koala sperm: an integrative study of the plasma membrane, chromatin stability and mitochondrial function
    S D Johnston
    School of Agriculture and Food Science, The University of Queensland, Gatton, Queensland 4343, Australia
    Reproduction 143:787-97. 2012
  10. ncbi Monitoring male southern hairy-nosed wombat (Lasiorhinus latifrons) reproductive function and seasonality in a captive population
    L A Hogan
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 118:377-87. 2010

Collaborators

Detail Information

Publications33

  1. ncbi Testosterone secretion, testicular histology and the cryopreservation of cauda epididymidal spermatozoa in the common ringtail possum (Pseudocheirus peregrinus)
    D J Phillips
    School of Animal Studies, The University of Queensland, Gatton, QLD 4343, Australia
    Reprod Fertil Dev 20:391-401. 2008
    ..Similar to other marsupial sperm, common ringtail possum cauda epididymidal spermatozoa required high levels of glycerol (10-16%) in order to maintain post-thaw viability...
  2. ncbi The multiple sex chromosomes of platypus and echidna are not completely identical and several share homology with the avian Z
    Willem Rens
    Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 OES, UK
    Genome Biol 8:R243. 2007
    ..In order to investigate monotreme sex chromosome evolution, we performed a comparative study of platypus and echidna by chromosome painting and comparative gene mapping...
  3. ncbi An investigation into the similarities and differences governing the cryopreservation success of koala (Phascolarctos cinereus: goldfuss) and common wombat (Vombatus ursinus: shaw) spermatozoa
    S D Johnston
    School of Animal Studies, University of Queensland, Gatton 4343, Australia
    Cryobiology 53:218-28. 2006
    ....
  4. ncbi Studies of male reproduction in captive African wild dogs (Lycaon pictus)
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton 4343, Australia
    Anim Reprod Sci 100:338-55. 2007
    ..8+/-5.8%; rate: 2.8+/-0.3; % intact plasma membranes: 33.4+/-5.3% and the % of damaged acrosomes: 4.4+/-1.5%) but following 2 h incubation at 37 degrees C, post-thaw survival declined markedly...
  5. ncbi One-sided ejaculation of echidna sperm bundles
    S D Johnston
    School of Animal Studies, University of Queensland, Gatton, Queensland 4343, Australia
    Am Nat 170:E162-4. 2007
    ..Sperm bundling appears to confer increased sperm motility, which may provide the potential for sperm competition between males...
  6. ncbi The development of a testosterone stimulation test in the Virginia opossum (Didelphis virginiana) and its use in evaluating deslorelin contraception
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, Queensland 4343, Australia
    Reprod Fertil Dev 20:563-9. 2008
    ....
  7. ncbi Assessment of reproductive status in male echidnas
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 97:114-27. 2007
    ..Testicular ultrasonography and spermatorrhea are useful in assessing reproductive status and in this study were successfully used to determine seasonal reproduction in captive echidnas...
  8. ncbi Non-invasive methods of oestrus detection in captive southern hairy-nosed wombats (Lasiorhinus latifrons)
    L A Hogan
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 119:293-304. 2010
    ..We therefore recommend the use of 24-h video surveillance as the most reliable method for oestrus detection in captive SHN wombats...
  9. ncbi Osmotic stress and cryoinjury of koala sperm: an integrative study of the plasma membrane, chromatin stability and mitochondrial function
    S D Johnston
    School of Agriculture and Food Science, The University of Queensland, Gatton, Queensland 4343, Australia
    Reproduction 143:787-97. 2012
    ....
  10. ncbi Monitoring male southern hairy-nosed wombat (Lasiorhinus latifrons) reproductive function and seasonality in a captive population
    L A Hogan
    School of Animal Studies, The University of Queensland, Gatton, 4343 Qld, Australia
    Anim Reprod Sci 118:377-87. 2010
    ....
  11. ncbi Collection, seminal characteristics and chilled storage of spermatozoa from three species of free-range flying fox (Pteropus spp.)
    C E de Jong
    The University of Queensland, St. Lucia, 4072 QLD, Australia
    Theriogenology 64:1072-89. 2005
    ..Tetracycline, penicillin, ciprofloxacin, and ceftazidime were the most effective antibiotics in preventing growth of all identified bacteria; however, their effects on sperm survival were not investigated...
  12. ncbi Oestrus in the Julia Creek dunnart (Sminthopsis douglasi) is associated with wheel running behaviour but not necessarily changes in body weight, food consumption or pouch morphology
    K Pollock
    School of Animal Studies, The University of Queensland, Gatton 4343, Australia
    Anim Reprod Sci 117:135-46. 2010
    ..The majority of the pouch variables examined showed maximum development during the inter-oestrus period but as there was considerable variation between animals, the pouch was not considered a useful index of oestrus...
  13. ncbi Testosterone secretion and pharmacological spermatozoal recovery in the cane toad (Bufo marinus)
    E Iimori
    School of Animal Studies, The University of Queensland, Gatton, Australia
    Anim Reprod Sci 90:163-73. 2005
    ..The hCG protocols developed in this study will have application in studies on the reproductive biology of rare and endangered male anurans...
  14. ncbi Flying-fox (Pteropus spp.) sperm membrane fatty acid composition, its relationship to cold shock injury and implications for cryopreservation success
    D F Melville
    School of Agriculture and Food Science, University of Queensland, Gatton, QLD 4343, Australia
    Cryobiology 65:224-9. 2012
    ..5). Membranes containing more PUFAs are more fluid, so the use of cryogenic media which improves membrane fluidity should improve Pteropus spp. spermatozoal viability post-thaw...
  15. ncbi Studies on the cryopreservation of common wombat (Vombatus ursinus) spermatozoa
    C MacCallum
    School of Animal Studies, The University of Queensland, Gatton, Australia
    Reprod Fertil Dev 17:727-32. 2005
    ..The present study also reports, for the first time, a successful pellet method of freezing wombat spermatozoa on dry ice; volumes of 0.25 and 0.5 mL resulted in higher post-thaw survival compared with 0.1-mL pellets...
  16. ncbi Relationship between thirty post-thaw spermatozoal characteristics and the field fertility of 11 high-use Australian dairy AI sires
    N J Phillips
    School of Veterinary Science, The University of Queensland, Brisbane, QLD 4072, Australia
    Anim Reprod Sci 81:47-61. 2004
    ....
  17. ncbi Expression of FGF2 and TGFalpha and testis morphology during testicular hypertrophy subsequent to hemicastration in the neonatal boar
    R Wells
    School of Animal Studies, The University of Queensland, Gatton, Australia
    Mol Reprod Dev 75:961-6. 2008
    ..It was concluded that upregulation of TGFalpha or FGF2 expression is not a pre-requisite for enhanced testicular growth and increased Sertoli cell proliferation that occurs subsequent to hemicastration in the neonatal boar...
  18. ncbi Cryopreservation of spermatozoa of black marlin, Makaira indica (Teleostei: Istiophoridae)
    K M van der Straten
    School of Animal Studies, The University of Queensland, Gatton, Australia
    Cryo Letters 27:203-9. 2006
    ..001) but spermatozoa frozen in 2.5% DMSO showed higher motility than those frozen in 5.0% DMSO (P = 0.014). Pellet size had no effect on post-thaw motility (P = 0.179)...
  19. ncbi Directional mapping of DNA nicking in ejaculated and cauda epididymidal spermatozoa of the short-beaked echidna (Tachyglossus aculeatus: Monotremata)
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, QLD 4343, Australia
    Reprod Fertil Dev 21:1008-14. 2009
    ....
  20. ncbi Reproductive seasonality and the effect of the GnRH agonist deslorelin as a contraceptive in captive male Black Flying-foxes (Pteropus alecto)
    D F Melville
    University of Queensland, School of Agriculture and Food Science, Gatton, Queensland, Australia
    Theriogenology 77:652-61. 2012
    ....
  21. ncbi Using a GnRH agonist to obtain an index of testosterone secretory capacity in the cockatiel (Nymphicus hollandicus) and sulphur-crested cockatoo (Cacatua galerita)
    E M Lovas
    School of Veterinary Science, The University of Queensland, St Lucia, Queensland, Australia
    Aust Vet J 88:52-6. 2010
    ..The major aim was to characterise testosterone secretion after injection of a gonadotropin-releasing hormone agonist (GnRHa), then use the test to investigate seasonal reproduction in the male cockatiel...
  22. ncbi Venipuncture in the short-beaked echidna
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton, Queensland 4343
    Aust Vet J 84:66-7. 2006
  23. ncbi Identifying the sex of short-beaked echidnas
    S D Johnston
    School of Animal Studies, The University of Queensland, 4343
    Aust Vet J 84:63-5. 2006
  24. ncbi Reproductive physiology of the female greater bilby (Macrotis lagotis Thylacomyidae): evidence for a male-induced luteal phase
    K Ballantyne
    School of Animal Studies, University of Queensland, Gatton, QLD 4343, Australia
    Reprod Fertil Dev 21:274-82. 2009
    ..Similar to female reproductive physiology in the Peramelidae, elevated progestogen concentration in the greater bilby was extended into lactation...
  25. ncbi Non-invasive monitoring of male and female numbat (Myrmecobius fasciatus: Myrmecobiidae) reproductive activity
    L A Hogan
    Perth Zoo, South Perth, WA, Australia
    Anim Reprod Sci 133:237-45. 2012
    ..Collectively, results of the present study confirm that PM and TM can be reliably used to index numbat reproductive activity...
  26. ncbi Semen-induced luteal phase and identification of a LH surge in the koala (Phascolarctos cinereus)
    S D Johnston
    School of Animal Studies, The University of Queensland, 4072, Australia
    Reproduction 128:629-34. 2004
    ..It was concluded that semen must be involved in the induction of a luteal phase in the koala. The results presented in this study will serve to improve optimal timing and induction of ovulation for artificial insemination in the koala...
  27. ncbi Biology of sperm chromatin structure and relationship to male fertility and embryonic survival
    M J D'Occhio
    School of Animal Studies, Faculty of Natural Resources, Agriculture and Veterinary Science, The University of Queensland, Gatton Campus, Gatton, QLD 4343, Australia
    Anim Reprod Sci 101:1-17. 2007
    ..In this regard, it is possible that 'male factor' infertility may emerge as an even more important component in embryonic development...
  28. ncbi Birth of a Banteng (Bos javanicus) calf at Western Plains Zoo after fixed time artificial insemination
    S D Johnston
    School of Animal Studies, The University of Queensland, Gatton
    Aust Vet J 80:94-5. 2002
  29. ncbi Dynamics of sperm DNA fragmentation in domestic animals II. The stallion
    C Lopez Fernandez
    Departamento de Biologia, Unidad de Genetica, Universidad Autonoma de Madrid UAM, 20849 Madrid, Spain
    Theriogenology 68:1240-50. 2007
    ..We suggest that the SCD test can be used as a routine assessment tool for the development and refinement of preservation protocols designed to reduce stallion sperm DNA damage...
  30. ncbi Sperm membrane fatty acid composition in the Eastern grey kangaroo (Macropus giganteus), koala (Phascolarctos cinereus), and common wombat (Vombatus ursinus) and its relationship to cold shock injury and cryopreservation success
    R R Miller
    Biology Department, Hillsdale College, Hillsdale, MI, USA
    Cryobiology 49:137-48. 2004
    ..Instead, cryogenic tolerance appears related to DHA levels...
  31. ncbi Persistent penile frenulum in a nilgai (Boselaphus tragocamelus)
    B Bryant
    Western Plains Zoo, Dubbo, New South Wales 2830
    Aust Vet J 82:419-20. 2004
  32. ncbi Development of the pulmonary surfactant system in non-mammalian amniotes
    S D Johnston
    Department of Physiology, University of Adelaide, SA 5005, Adelaide, Australia
    Comp Biochem Physiol A Mol Integr Physiol 129:49-63. 2001
    ..Thus, despite temporal differences and vastly different lung morphologies, birth strategies and phylogenies, the overall development and maturation of the PS system is highly conserved amongst the amniotes...
  33. ncbi Effects of finasteride on size of the prostate gland and semen quality in dogs with benign prostatic hypertrophy
    K Sirinarumitr
    Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman 99164, USA
    J Am Vet Med Assoc 218:1275-80. 2001
    ..CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that finasteride can be used to reduce prostatic size in dogs with BPH without adversely affecting semen quality or serum testosterone concentration...