Abstract:

Clinical hyperestrogenism associated with unintentional phytoestrogenic soybean intake

Josh Timmer, BVSc; Damian Holden, DVM; Peter C. Scott, BVSc, PhD; Steven McOrist, BVSc, PhD

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This case study characterizes breeding performance related to unintentional dietary intake of phytoestrogenic compounds. Breeder farms A (affected) and B (unaffected) were under single management and supplied by two unconnected feed mills. Breeding parameters were recorded over 2 years and feed analyzed for mycotoxins and isoflavonoids. Farm B had consistently better breeding performance. Clinical signs of hyperestrogenism (vulval tumefaction, mammary gland dysfunction, and delayed estrus) were evident in 5% to 10% of breeding females on farm A. Mycotoxin concentrations were negligible, but phytoestrogenic isoflavonoid concentrations associated with one source of soybean meal were above 55,000 µg/kg on farm A.

Keywords: fertility, phytoestrogens, hyperestrogenism, soybean meal

Cite as: Timmer J, Holden D, Scott PC, McOrist S. Clinical hyperestrogenism associated with unintentional phytoestrogenic soybean intake. J Swine Health Prod 2020;28(6):302-309.

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