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Effect of pre-treatment of melatonin on superovulation response, circulatory hormones, and miRNAs in goats during environmental heat stress conditions

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Abstract

Environmental heat stress has a deleterious impact on farm animal reproductive performance. The purpose of this study was to see how the addition of melatonin affected the efficacy of the superovulation regimen in goats in hot climatic conditions. Sixteen Shiba goats were synchronized and divided into two equal groups (n = 8, each): the melatonin group, which received a single S/C dose of melatonin, and a control group, treated with one ml of corn oil only. Ultrasonographic assessment of ovarian structures (Graafian follicles; GFs and corpus lutea; CLs) morphometry and hemodynamics were performed during the estrous phase of the superovulation (D0) and at day7 after ovulation (D7) of the superovulation regimen. The peripheral reproductive hormones were measured, and microRNAs were characterized. The mean diameter and the total-colored area of GFs during the D0 were significantly (P˂0.05) higher in the melatonin group (5.42 ± 0.11 mm and 1592.20 ± 45.26 pixels, respectively) compared to the control group (4.62 ± 0.12 mm and 1052.55 ± 29.47 pixels, respectively). Concentrations of LH and E2 increased significantly (P˂0.05) in the melatonin group (1.06 ± 0.06 ng/ml and 46.34 ± 2.77 pg/ml, respectively) compared to the control group (0.75 ± 0.12 ng/ml and 29.33 ± 1.89 pg/ml, respectively). At D7, the melatonin-received goats attained greater values in the mean count (6.75 ± 0.33, P˂0.005), diameters (6.08 ± 0.12 mm, P˂0.01), and total-colored area (17137.30 ± 128.53 pixels, P˂0.01) of detected CLs and progesterone concentrations (4.08 ± 0.24 ng/ml) compared to control goats (4.00 ± 0.28, 4.50 ± 0.19 mm, 11156.87 ± 117.90 pixels, and 2.90 ± 0.18 ng/ml respectively). MiRNA expression analysis was identified during both stages denoting several up and downregulated miRNA candidates among the studied groups. In conclusion, incorporating melatonin enhanced the efficiency of the superovulation regimen in goats under hot climatic conditions.

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Data Availability

The data that support this study are available in the article and accompanying online supplementary material (Supplement files 1 & 2).

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Acknowledgements

We are grateful to Dr. A.F. Parlow (National Institute of Diabetes and Digestive and Kidney Diseases, Beltsville, MD) for supplementing the first antibodies for measurement of FSH and LH by RIA, and Dr. G.D. Niswender (Animal Reproduction and Biotechnology Laboratory, Colorado State University, Fort Collins, CO) for providing antisera against estradiol-17β (GDN 244). The authors would like to extend their appreciation to the Deanship of Scientific Research at King Khalid University for supporting this study under the large group project number (R.G.P 2/161/44). Also, the authors acknowledge Dr. Natsumi Endo and Dr. Kentaro Nagaoka for their technical support.

Funding

JSPS postdoctoral fellowship for research in Japan (FY19-ID No. P19101) partially supported this research through the first and last authors.

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Contributions

H.S: Conceptualization, Methodology, Investigation, Visualization, Data curation, Formal analysis, Validation, Writing - original draft, Writing- review & editing. M.S: Methodology, Analysis, Validation, and Editing of the manuscript. F.R: Software, Writing-review & editing. A. S. M., H.R. El-S., and A.E.A.: Validation, Analysis, and Writing- review & editing. K.M. Al-S. and F.A. Al-S.: Writing- review & editing. G. W.: Supervision, Visualization, Validation, Funding acquisition, Resources, Writing - review & editing.

Corresponding author

Correspondence to Haney Samir.

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All methods in this investigation were performed following the Tokyo University of Agriculture and Technology, Japan, rules for the research use of animals (Ethical No. R02-73).

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Samir, H., Samir, M., Radwan, F. et al. Effect of pre-treatment of melatonin on superovulation response, circulatory hormones, and miRNAs in goats during environmental heat stress conditions. Vet Res Commun 48, 459–474 (2024). https://doi.org/10.1007/s11259-023-10239-2

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