Abstract
The objective of this study was to investigate variation in sperm quality metrics (motility, velocity, and concentration) in the critically endangered Mississippi gopher frog (Lithobates sevosus) over three sampling time points after a luteinizing hormone-releasing hormone analog (LHRHa) induction injection. Sperm was repeatedly collected from 11 individuals over three sampling times (30, 60, and 120 min) after injection. Variation in sperm quality was investigated using a repeated-measures mixed model approach. Repeated measures analyses of variance showed a significant effect of sampling time for percent motility and velocity. Concentration was found to be marginally related to sampling time, while progressive motility was not significantly related to time after injection. Our findings are important for optimizing assisted reproduction-related fertilization success and increasing the successful propagation of endangered species of imperiled frogs in captive breeding programs.
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