More and more research, mostly on humans and dogs I find, is coming out to suggest the benefits of ovary producing estrogen is significant and contributes to better health and longer life for the female of the species.
I think you will have to be checking out websites and making phone calls or maybe sending out emails. Another consideration, I think, is leaving only part of an ovary in. A female, human co-worker had that done about 30 years ago but unfortunately I've lost track of her.
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