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Relationship between kisspeptin-10, neurokinin B and dynorphin A in the course of normal and delayed puberty in ewes Cover

Relationship between kisspeptin-10, neurokinin B and dynorphin A in the course of normal and delayed puberty in ewes

Open Access
|Mar 2026

Abstract

Introduction

Kisspeptin (KiSS), neurokinin B (NKB) and dynorphin A (Dyn A) participate in the neuroendocrine regulation of reproductive system development and functioning; however, their roles in the onset of sexual maturity and pathomechanism of delayed puberty have not yet been fully elucidated. The aim of the study was to determine changes in the kisspeptin-10 (KiSS-10), NKB and Dyn A concentration in blood plasma collected from ewe lambs during puberty in relation to the first ovulation time, and to examine the relationship between these neuropeptides.

Material and Methods

Twenty-four ewe lambs were divided into two groups: from single (S) pregnancies and from twin (T) pregnancies. To determine the KiSS-10, NKB and Dyn A concentration with ELISA, blood was collected from all sheep at 4, 5, 6, 7, 8, 9 and 10 months of age. Singletons and twins had their first ovulations at 8 and 10 months of age, respectively.

Results

Changes in the KiSS-10 and NKB concentrations were positively correlated with age in both S (r = 0.86) and T ewes (r = 0.89). A negative correlation was found between KiSS-10 and Dyn A (r = –0.55 and –0.98, for S and T, respectively) and between NKB and Dyn A (r = –0.89 and –0.94, for S and T, respectively).

Conclusion

The initiation of ovarian activity is associated with concurrent increases in plasma KiSS-10 and NKB concentrations with age and reduced Dyn A concentrations in both groups. Our results show that these neuropeptides may regulate the timing of reproductive activity onset in sheep.

Language: English
Submitted on: Nov 4, 2025
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Accepted on: Feb 23, 2026
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Published on: Mar 2, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2026 Natalia Szysiak, Urszula Kosior-Korzecka, Monika Greguła-Kania, Krzysztof Patkowski, Mateusz Fila, Andrzej Junkuszew, published by National Veterinary Research Institute in Pulawy
This work is licensed under the Creative Commons Attribution 4.0 License.

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