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. 2015 Nov 13;10(11):e0142549. doi: 10.1371/journal.pone.0142549

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© 2015 Huan et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — The proportions of preovulation, periovulation and postovulation on Day 1–5 of estrus. Preovulation and periovulation mainly occurred on Day 1 and Day 2, respectively, and all the surrogates were under postovulation on Day 4 and Day 5 of estrus. The number of surrogates detected was on the top of column chart. ^a-cValues for a given status with different superscripts differ significantly (P<0.05).