| Scott Fritz, DVM, ABVT ToxicologistBeef Cattle Institute Kansas State University Scottfritz@vet.k-state.edu |
Sources
Alfalfa is the most common source of phytoestrogen exposure in the US. Other clover species can contribute to the total exposure.
Mechanism
Phytoestrogens bind to estrogen receptors in the animal leading to multiple effects.
Signs
The most economically important clinical sign associated with phytoestrogens is infertility. This is especially true in pre-pubescent animals that are exposed and can lead to life-long infertility by disrupting the estrogen-influenced maturation process. Prolapses have also been associated with feeding high levels of phytoestrogens. Phytoestrogens do not cause abortion.
Treatment
Remove the suspect source.
Diagnosis
Phytoestrogen evaluation of suspect feed source. Clinical improvement following removal.
Links