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Urinary specific gravity as an alternative for the normalisation of endocrine metabolite concentrations in giant panda (Ailuropoda melanoleuca) reproductive monitoring

(2018) PLOS ONE. 13(7).
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Abstract
Reproductive monitoring for captive breeding in giant pandas is based on behavioural observation and non-invasive hormone analysis. In urine, interpretation of results requires normalisation due to an animal's changing hydration. Correction of urinary concentrations based on creatinine is the gold standard. In this study, a largely unexplored, easy-to-perform normalisation technique, based on urinary specific gravity (USpG), was examined and compared to creatinine. To this extent, six cycles from two female pandas (SB741(1) and SB569 (5)) were monitored through urine analysis for oestrogen, progesterone, ceruloplasmin and 13,14-dihydro-15-keto-PGF2a (PGFM). The Pearson's correlation between creatinine and USpG was high (r = 0.805-0.894; p < 0.01), indicative for a similar performance of both normalisation methods. However, generally lower values were observed during pro-oestrus and primary (progesterone) rise. This could be associated with huge shifts in appetite, monitored by faecal output (kg) with an averaged > 50% decrease during oestrus and > 50% increase during primary progesterone rise. In parallel, respectively highest and lowest creatinine and USpG levels, were measured, with creatinine obviously more affected as a result of linkage with muscle tissue metabolism affected by reproductive hormones. As a consequence, metabolite levels were significantly different between both corrected datasets with significantly higher oestrogen peak levels during oestrus ranging from 2.13-86.93 and 31.61-306.45 ng/mL (USpG correction) versus 2.33-31.20 and 36.36-249.05 ng/mL Cr (creatinine correction) for SB569 and SB741 respectively, and significant lower progesterone levels during primary progesterone rise ranging from 0.35-3.21 and 0.85-6.80 ng/mL (USpG correction) versus 0.52-10.31 and 2.10-272.74 ng/mL Cr (creatinine correction) for SB569 and SB741 respectively. Consequently, USpG correction rendered unbiased profiles, less subject to variation and metabolic artefacts and therefore allowed a more straightforward identification of peak oestrogen and onset of secondary progesterone rise, being potentially advantageous for future studies unravelling key giant panda reproductive events, including (delayed) implantation. The alternative application of USpG as a normalisation factor was further supported by its easy application and environmental and technical robustness.
Keywords
PLASMA-CONCENTRATIONS, SERUM CERULOPLASMIN, PHYSICAL-ACTIVITY, HORMONE, CREATININE, PREGNANCY, PGFM, REFRACTOMETERS, PROGESTERONE, WILDLIFE

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Chicago
Wauters, Jella, Kirsten S. Wilson, Tim Bouts, Iain Valentine, Koen Vanderschueren, Cyrillus Ververs, A. Forbes Howie, et al. 2018. “Urinary Specific Gravity as an Alternative for the Normalisation of Endocrine Metabolite Concentrations in Giant Panda (Ailuropoda Melanoleuca) Reproductive Monitoring.” Plos One 13 (7).
APA
Wauters, Jella, Wilson, K. S., Bouts, T., Valentine, I., Vanderschueren, K., Ververs, C., Howie, A. F., et al. (2018). Urinary specific gravity as an alternative for the normalisation of endocrine metabolite concentrations in giant panda (Ailuropoda melanoleuca) reproductive monitoring. PLOS ONE, 13(7).
Vancouver
1.
Wauters J, Wilson KS, Bouts T, Valentine I, Vanderschueren K, Ververs C, et al. Urinary specific gravity as an alternative for the normalisation of endocrine metabolite concentrations in giant panda (Ailuropoda melanoleuca) reproductive monitoring. PLOS ONE. 2018;13(7).
MLA
Wauters, Jella, Kirsten S. Wilson, Tim Bouts, et al. “Urinary Specific Gravity as an Alternative for the Normalisation of Endocrine Metabolite Concentrations in Giant Panda (Ailuropoda Melanoleuca) Reproductive Monitoring.” PLOS ONE 13.7 (2018): n. pag. Print.
@article{8570362,
  abstract     = {Reproductive monitoring for captive breeding in giant pandas is based on behavioural observation and non-invasive hormone analysis. In urine, interpretation of results requires normalisation due to an animal's changing hydration. Correction of urinary concentrations based on creatinine is the gold standard. In this study, a largely unexplored, easy-to-perform normalisation technique, based on urinary specific gravity (USpG), was examined and compared to creatinine. To this extent, six cycles from two female pandas (SB741(1) and SB569 (5)) were monitored through urine analysis for oestrogen, progesterone, ceruloplasmin and 13,14-dihydro-15-keto-PGF2a (PGFM). The Pearson's correlation between creatinine and USpG was high (r = 0.805-0.894; p {\textlangle} 0.01), indicative for a similar performance of both normalisation methods. However, generally lower values were observed during pro-oestrus and primary (progesterone) rise. This could be associated with huge shifts in appetite, monitored by faecal output (kg) with an averaged {\textrangle} 50\% decrease during oestrus and {\textrangle} 50\% increase during primary progesterone rise. In parallel, respectively highest and lowest creatinine and USpG levels, were measured, with creatinine obviously more affected as a result of linkage with muscle tissue metabolism affected by reproductive hormones. As a consequence, metabolite levels were significantly different between both corrected datasets with significantly higher oestrogen peak levels during oestrus ranging from 2.13-86.93 and 31.61-306.45 ng/mL (USpG correction) versus 2.33-31.20 and 36.36-249.05 ng/mL Cr (creatinine correction) for SB569 and SB741 respectively, and significant lower progesterone levels during primary progesterone rise ranging from 0.35-3.21 and 0.85-6.80 ng/mL (USpG correction) versus 0.52-10.31 and 2.10-272.74 ng/mL Cr (creatinine correction) for SB569 and SB741 respectively. Consequently, USpG correction rendered unbiased profiles, less subject to variation and metabolic artefacts and therefore allowed a more straightforward identification of peak oestrogen and onset of secondary progesterone rise, being potentially advantageous for future studies unravelling key giant panda reproductive events, including (delayed) implantation. The alternative application of USpG as a normalisation factor was further supported by its easy application and environmental and technical robustness.},
  articleno    = {e0201420},
  author       = {Wauters, Jella and Wilson, Kirsten S. and Bouts, Tim and Valentine, Iain and Vanderschueren, Koen and Ververs, Cyrillus and Howie, A. Forbes and Rae, Mick T. and Van Soom, Ann and Li, Rengui and Li, Desheng and Zhang, Hemin and Vanhaecke, Lynn},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  language     = {eng},
  number       = {7},
  pages        = {21},
  title        = {Urinary specific gravity as an alternative for the normalisation of endocrine metabolite concentrations in giant panda (Ailuropoda melanoleuca) reproductive monitoring},
  url          = {http://dx.doi.org/10.1371/journal.pone.0201420},
  volume       = {13},
  year         = {2018},
}

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