J K OBrien
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Explore the profile of J K OBrien including associated specialties, affiliations and a list of published articles.
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67
Citations
446
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Recent Articles
1.
Bryant B, Stoops M, Conaghan J, Williams J, Campbell-Ward M, Wallace A, et al.
Zoo Biol
. 2025 Jan;
PMID: 39777411
A zoo-based, 11-year-old, uniparous southern black rhinoceros (Diceros bicornis minor) failed to conceive after weaning a calf. Behavioral observation and fecal progestagen monitoring confirmed irregular estrous cycles. Serial transrectal reproductive...
2.
Lu A, Fei Z, Haghani A, Robeck T, Zoller J, Li C, et al.
Nat Aging
. 2023 Sep;
3(11):1462.
PMID: 37674040
No abstract available.
3.
Lu A, Fei Z, Haghani A, Robeck T, Zoller J, Li C, et al.
Nat Aging
. 2023 Aug;
3(9):1144-1166.
PMID: 37563227
Aging, often considered a result of random cellular damage, can be accurately estimated using DNA methylation profiles, the foundation of pan-tissue epigenetic clocks. Here, we demonstrate the development of universal...
4.
Pollock K, OBrien J, Roth T, Proudfoot J, Niederlander J, Micheas L, et al.
Gen Comp Endocrinol
. 2020 Apr;
294:113487.
PMID: 32278883
Serum collected across the lifespan of four managed rhino species: black (Diceros bicornis, n = 16), white (Ceratotherium simum simum, n = 19), greater one-horned (GOH, Rhinoceros unicornis, n = ...
5.
OBrien J, Steinman K, Fetter G, Robeck T
Andrology
. 2016 Sep;
5(1):180-190.
PMID: 27636553
Circulating concentrations of testosterone and its precursor androstenedione, as well as dehydroepiandrosterone (DHEA) and the adrenal hormones cortisol and corticosterone were measured at monthly intervals in 14 male killer whales...
6.
Roth T, Stoops M, Robeck T, OBrien J
Anim Reprod Sci
. 2016 Feb;
167:22-30.
PMID: 26879096
The goal of this study was to identify factors that influenced the ability to successfully rescue sperm post-mortem from rhinoceroses maintained in North American zoos. Factors considered included procedural technicalities,...
7.
OBrien J, Schmitt T, Nollens H, Dubach J, Robeck T
Gen Comp Endocrinol
. 2015 Sep;
225:81-94.
PMID: 26393312
Eight captive female Magellanic penguins (Spheniscus magellanicus) were monitored over a 10week period, commencing at 5weeks prior to egg lay (EL), to increase our understanding of the species' reproductive biology....
8.
OBrien J, Roth T, Stoops M, Ball R, Steinman K, Montano G, et al.
Anim Reprod Sci
. 2014 Dec;
152:137-53.
PMID: 25497423
White rhinoceros ejaculates (n=9) collected by electroejaculation from four males were shipped (10°C, 12h) to develop procedures for the production of chilled and frozen-thawed sex-sorted spermatozoa of adequate quality for...
9.
Robeck T, Montano G, Steinman K, Smolensky P, Sweeney J, Osborn S, et al.
Anim Reprod Sci
. 2013 May;
139(1-4):168-81.
PMID: 23660366
Since its development in bottlenose dolphins, widespread application of AI with sex-selected, frozen-thawed (FT) spermatozoa has been limited by the significant expense of the sorting process. Reducing the total number...
10.
OBrien J, Steinman K, Montano G, Love C, Robeck T
Andrology
. 2013 Mar;
1(3):387-400.
PMID: 23536498
Ejaculates from nine Asian and two African elephants were analysed to gain a further understanding of mechanisms underlying variable semen quality after transrectal massage. Semen analysis was performed after collection...