http://multinationalmonitor.org/hype…oblems-us.html
In animal testing of Depo-Provera, the effects have been even more serious; required testing found breast tumors in beagle dogs and endometrial cancer in monkeys.
https://www.ncbi.nlm.nih.gov/pubmed/8200213
The effects of DMPA on reproductive tissue have been inconsistent, but there appear to be some effects on both the male and female reproductive organs. Studies on DMPA mutagenic and carcinogenic potentials indicate that chromosomal aberrations occur in hamsters and dogs. DMPA was found to produce tumors in dogs. It was concluded that a dose-related effect for the tumor production response in dogs was evident.
This study is pretty sciency - but it basically says there was a higher risk for sexual infection in those who are using Depo regularly due to the thinning of the vaginal wall.
http://www.sciencedirect.com/science…42682206002388
http://www.doctorramey.com/help-my-mares-in-heat-i-think-part-2/
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“Depo” shots. Depo-provera® is a brand of progesterone that’s sometimes given to women to prevent pregnancy and to treat endometriosis (you can read all about it if you CLICK HERE). It’s usually given to women once every three months, and it releases slowly (which is why you only have to give it every three months).
So… if it works for people, it must work for horses, right?
Well, in a word, NO! Why? Same reason the pellets don’t work. There’s not enough progesterone in the shot to make a difference in a horse. And it’s been tested several times, too. Don’t bother giving your mare a Depo-Provera® shot to keep her out of heat.
Other studies show that bone density is effected severely. My sister became diabetic after using depo, and my vet has said he can not believe that Depo is used or even approved by the FDA or Health Canada for use because it is so volatile.
The side effects can take time to show up, sometimes years after use.
I would highly recommend people NOT use this drug and if they feel they must, do not use it in an animal you ever intend to breed.
There have been NO short or long term studies on the effects of horses. Why would you treat your horse as a science experiment?