Re: Chasteberry and heats
I don't have an answer for you but am very interested to see any responses you get. I just started my mare on Chasteberry this spring too and it has helped with her shedding for sure. But, her heats are just as you describe---atypical and extreme---her lot has another adjacent where another mare is kept, so her "buddy" is constantly there. She also can get quite spooky.
4/2014 Santa Rosa, California
Honey Case History: https://ecir.groups.io/g/CaseHistory/files/Tina%20and%20Honey .
Photo Album: https://ecir.groups.io/g/CaseHistory/album?id=36565 .