Presence and determination of manure-borne estrogens from dairy and beef cattle feeding operations in northeast China.

@article{Wei2011PresenceAD,
  title={Presence and determination of manure-borne estrogens from dairy and beef cattle feeding operations in northeast China.},
  author={Han Wei and Li Yan-xia and Yang Ming and Li Wei},
  journal={Bulletin of environmental contamination and toxicology},
  year={2011},
  volume={86 5},
  pages={465-9}
}
Four estrogens in cattle feces collected from 24 dairy and beef feeding operations located in the northeast of China were investigated. The average concentration of 17α-estradiol, 17β-estradiol and estrone in dairy feces was 194.6, 104.4, and 262 μg/kg, respectively. While as to beef waste the mean content of 17α-estradiol, 17β-estradiol and estrone was 104.5, 67.7 and 216.4 μg/kg, respectively. Estriol was below the detection limit in all samples. The 17β-estradiol equivalents of all samples… CONTINUE READING