Killed a cow elk today September 27th with a fully developed fetus

That's wild. Gestation is like 240-270 day. If the rut was ~9/15 last year that calf should have been born in May.
 
Probably just gonna be born late. Guessing the cow was bred real late?

Last year I saw a cow all by herself up near timberline. Saw her a few days in a row and thought it was odd she was by herself. Then one day I saw a wobbly tiny calf come out of the trees with her. This was mid September.

If elk or deer aren’t bred during the normal rut they will come back into cycle later.
 
Yes, it happens. Rare though. When doing field work studying elk I saw numerous elk with fetuses (via ultrasound) many months of the year. It is rare but for one reason or another it happens. Little research (to my knowledge) has been done on estrus cycles of elk outside of the 1st and 2nd "peak" but i could imagine that it continues cycling until/unless pregnant as happens in other mammals. I suspect it actually would have survived though it would have been a tough first year!

Here is some of the relevant research:
- https://www.fs.usda.gov/rm/pubs_journals/2015/rmrs_2015_keller_b001.pdf (MO/SD births into sep 26)
- https://academic.oup.com/jmammal/article/104/6/1264/7273652 (august births but also kentucky)

I don't know of "classic" mtn west research locations publishing similar results
 
Still 8 months later would only be August 1st. Either way I have come to terms that there was no way this calf could have made it due to either being stillborn if there was some complication or if it really was going to be a late birth winter would set it very fast and the calf would have suffered heavily.
 
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