title: Presence and determination of manure-borne estrogens from dairy and beef cattle feeding operations in northeast China.
abstract: 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 ranged from 45.8 to 926.1 μg/kg and dairy together with beef probably generated 16 times more estrogens than the human population in the study area.
authors: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875 Beijing, China.
authors: Han
authors: H
authors: Wei
authors: Li
authors: L
authors: Yan-xia
authors: Yang
authors: Y
authors: Ming
authors: Li
authors: L
authors: Wei
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000822:Animal Husbandry; D000818:Animals; D002417:Cattle; D002681:China; D003612:Dairying; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D004967:Estrogens / Q000032:analysis*; D005243:Feces / Q000737:chemistry*; D008372:Manure / Q000032:analysis*
chemical_list: D004785:Environmental Pollutants; D004967:Estrogens; D008372:Manure