There is a seasonal effect, but the fasting increase in ACTH is real:

Influence of feeding status, time of ... [Domest Anim Endocrinol. 2014] - PubMed - NCBI

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From the abstract:

“Differences between fasted and fed horses were found in baseline ACTH, 17.1 ± 1.8 versus 46.1 ± 7.6 pg/mL”

This can only be read as the ACT was 17.1 ± 1.8 after fasting and 46.1 ± 7.6 2 h after feeding, i.e. quite contrary to what Linda K reported.

I assume that there is an error in the abstract?

Lars

Sweden, July 2008