I have heard of this type of thing, but I have not had it happen quite this close before! All 3 of my girls are cycling at the same time and no, we did not give them any help at all! There is not even a boy here to get them going. Now the next 2 days of my life are super busy as 2 are getting bred today and the other tomorrow. This is the second cycle we have tracked this year and they were just as close then too! Now, if only they would all take this first time so next year’s foal watch would be easy!!!
Now that I have a couple of my old girls retired, they are cycling in unison like clockwork. I have not lived with them in unpregnant states for years and the eeking and squeaking duet is mind boggling. :winkgrin::lol::lol::lol::winkgrin:
[QUOTE=Home Again Farm;6232929]
Now that I have a couple of my old girls retired, they are cycling in unison like clockwork. I have not lived with them in unpregnant states for years and the eeking and squeaking duet is mind boggling. :winkgrin::lol::lol::lol::winkgrin:[/QUOTE]
For the past three years all my mares have cycled together… been bred together and foaled within 2 days of each other:eek: Lots of running… then its done. I think its similar… (I remember reading that when young women live together… their periods end becoming synced…) 
Yes, mine, when not pregnant, will synchronize. It must be a symphony at your place Mary Lou.
Gosh, I’m hoping that happens at my place this year…I’m taking heart (and wallet) in hand and making a try at ET this year.
I guarantee it is only happening because I have no plans to breed the girls. :winkgrin:
I have 5 mares due within 5 days of each other this year…
Yep! The Carolus I and the Cardento mare are in synch. I pray they stay that way for next cycle!
We have about 20 mares on the property. Generally speaking, the pastures cycle at the same time. Spring’s transitional heats have squealing and squatting going on 24/7 for about 2 solid weeks each month. I brought in two of the ‘full time turnout outsiders’ to the mare barn today for the dentist and they were teasing to the mares from the ‘other’ pasture through the bars the whole time they were in the barn. :sigh:
But as a general rule - ours usually ovulate within a week of one another when we are breeding - the trick has been to catch the ‘lead’ mare, so as to get them checked and bred without having to short cycle.
I just read about this, but I can’t remember where!
This is common in cycling females of many species, when several females are together and there aren’t males around. Hamsters do it, and so do college girls. 
The cycles become longer and synchronize.
Once a male shows up, the cycles go back to normal length. (And I guess some get pregnant, which would desynchonize things. )
It’s caused by pheromones.
Yes. Not at all uncommon.
Dormitory effect. Common in many species, including horses ;).
