Determination of Efficacy of Single and Double 4.7 mg Deslorelin Acetate Implant on the Reproductive Activity of Female Pond Sliders (Trachemys scripta) - PubMed
- ️Fri Jan 01 2021
Determination of Efficacy of Single and Double 4.7 mg Deslorelin Acetate Implant on the Reproductive Activity of Female Pond Sliders (Trachemys scripta)
Edoardo Bardi et al. Animals (Basel). 2021.
Abstract
The use of long-acting gonadotropin-releasing hormone (GnRH) agonists to suppress fertility has been poorly investigated in reptiles, and the few available studies show inconsistent results. The efficacy of single and double intramuscular 4.7 mg deslorelin acetate implants in captive pond sliders (Trachemys scripta) was investigated, with 20 animals divided into three groups: a single-implant group (6 animals), a double-implant group (6 animals), and a control group (no implant). During one reproductive season (March to October), plasmatic concentration of sexual hormones (estradiol, progesterone, and testosterone) and ovarian morphometric activity via computed tomography were monitored about every 30 days. A significative decrease in the number of phase II ovarian follicles was detected in the double-implant group compared with the control group, but no significant difference was noted in the number of phase III and phase IV follicles, egg production, and plasmatic concentration of sexual hormones. Results show that neither a single nor a double deslorelin acetate implant can successfully inhibit reproduction in female pond sliders during the ongoing season, but the lower number of phase II follicles in the double-implant group can possibly be associated with reduced fertility in the following seasons.
Keywords: GnRH agonist; Trachemys scripta; contraception; deslorelin acetate; pond slider; reptile; turtle.
Conflict of interest statement
The authors declare no conflict of interest.
Figures
Flowchart illustrating the experimental methodology of the present study. E2 = estradiol; P3 = progesterone; T = testosterone; G1 = group 1; G2 = group 2; G3 = group 3.
Comparison of the number of follicles between experimental groups and across timepoints. (A) Comparison between the control (black), single-implant (light gray), and double-implant (dark gray) groups. (B–D) Comparison between the three experimental groups for follicles in phases II (B), III (C), and IV (D) separately. In all panels, large dots represent means by group and timepoint, and vertical bars represent standard errors.
Number of oviductal eggs by experimental group and across timepoints. Large dots represent means by group and timepoint, and vertical bars represent standard errors.
Hormone concentration values in the different experimental groups and across timepoints. Progesterone values are shown in panel (A), while testosterone values are shown in panel (B). Large dots represent means by group and timepoint, and vertical bars represent standard errors.
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