Just in passing phytoestrogen effects in livestock are not unknown.

Sheep with a tup fed on clover-rich swards fail to ovulate and breeding
can be seriously affected or even prevented. This has been known for
decades.

It has been postulated that phytoestogens in soya (rather high) are
responsible for unpredicted increases in weight gains in pigs,
effectively a natural application of hormones (see growth promoters).


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Oz
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