NDLI: E-Screen evaluation of sugar beet feedstuffs in a case of reduced embryo transfer efficiencies in cattle: the role of phytoestrogens and zearalenone

Content Provider	Springer Nature Link
Author	Shappell, N. W. Mostrom, M. S. Lenneman, E. M.
Copyright Year	2012
Abstract	The E-Screen assay was used to evaluate the estrogenicity of sugar beet by-products obtained from a dairy farm experiencing low success rates of embryo transfer. The beet tailings had ~3-fold the estradiol equivalents of the pelleted beet pulp (3.9 and 1.2 μg estradiol equivalents or E$_{2}$Eq/kg dry matter, respectively). Whole sugar beets, sugar beet pellets, and shreds from several Midwest US locations were also evaluated by E-Screen. All pellets examined were found to have some estrogenic activity (range ~0.1–2.0 μg E$_{2}$Eq/kg DM) with a mean of 0.46 μg/kg dry matter and median of 0.28 μg/kg dry matter. Relative E$_{2}$Eq ranked as follows: pellets > shreds > most unprocessed roots. Using recommended feeding levels and conservative absorption estimates (10%), the estrogenic activity in the original samples could result in blood estradiol equivalents ≥ those found at estrus (10 pg/mL, cows). Chemical analyses revealed no known phytoestrogens, but the estrogenic mycotoxin, zearalenone, was found in 15 of 21 samples. Of significance to those using the E-Screen are our findings that contradict previous reports: ß-sitosterol has no proliferative effect and genistein’s glucuronidated form—genistin—is equal to genistein in proliferative effect. The latter is the result of deconjugation of genistin to genistein in the presence of fetal bovine serum (determined by LC MSMS). These data show the usefulness and caveats of the E-Screen in evaluation of feedstuffs, and indicate a potential for sugar beet by-products to contain zearalenone at concentrations that may impact reproduction.
Starting Page	216
Ending Page	228
Page Count	13
File Format	PDF
ISSN	10712690
Journal	In Vitro Cellular & Developmental Biology - Animal
Volume Number	48
Issue Number	4
e-ISSN	1543706X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MCF-7 Estrogenicity Subfertility Zearalenone Sugar beets Animal Genetics and Genomics Stem Cells Developmental Biology Cell Biology Cell Culture
Content Type	Text
Resource Type	Article
Subject	Cell Biology Developmental Biology Medicine

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