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. 2021 Sep 10;8(9):190. doi: 10.3390/vetsci8090190

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Serum progesterone concentrations in acyclic mares (n = 12) treated with intravaginal progesterone-releasing device (IPRD). (A) Mares were treated with estradiol-17β for 3 days and then given an IPRD (D0). The IPRD was removed nine days later (D9). (B) Mares were resynchronized three days after removal of IPRD after the first synchronization. Mares were again treated with estradiol-17β for 3 days and then had a new IPRD inserted (R0). The IPRD was kept for three days (R3). D, day after treatment with IPRD; R, day after resynchronization with IPRD. Different superscripts (^a,b) denote effect of days (p < 0.05).