title: No carry over of unmetabolised deoxynivalenol in milk of dairy cows fed high concentrate proportions.
abstract: To examine the carry over of deoxynivalenol (DON) and its metabolite de-epoxy DON (DOM-1) in milk, lactating German Holstein cows (n = 13) were fed an isoenergetic total mixed ration in Period 1 with 50% concentrates and 5.3 mg DON/kg dry matter (DM) over 11 wk and were compared with control cows (n = 14). In Period 2 (18 wk), an elevated concentrate proportion was compared to a low concentrate ration by dividing the cows into four Groups (n = 8): Control-30 (30% concentrates), Myco-30 (30% concentrates, 4.4 mg DON/kg DM), Control-60 (60% concentrates) and Myco-60 (60% concentrates, 4.6 mg DON/kg DM). Taken both periods together, no unmetabolised DON was detected in milk samples using the HPLC-UV method. DOM-1 concentrations ranged between below the LOD and 3.2 microg/kg milk in mycotoxin fed cows, while control cows did not excrete any measurable amounts of DOM-1. Regarding the concentrate effects, the carry over of DON as DOM-1 in milk was negligible (between 0.0001 and 0.0011) but significantly higher in Group Myco-30 than in Group Myco-60. This effect may result from an altered bioavailability of DON from maize silage which made up a higher proportion of the daily ration.
authors.affiliation: Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Federal Research Institute for Animal Health, Braunschweig, Germany.
authors.forename: Christina
authors.initials: C
authors.lastname: Keese
authors.forename: Ulrich
authors.initials: U
authors.lastname: Meyer
authors.forename: Hana
authors.initials: H
authors.lastname: Valenta
authors.forename: Margit
authors.initials: M
authors.lastname: Schollenberger
authors.forename: Alexander
authors.initials: A
authors.lastname: Starke
authors.forename: Ina-Alexandra
authors.initials: IA
authors.lastname: Weber
authors.forename: Jürgen
authors.initials: J
authors.lastname: Rehage
authors.forename: Gerhard
authors.initials: G
authors.lastname: Breves
authors.forename: Sven
authors.initials: S
authors.lastname: Dänicke
mesh_terms: D000818:Animals; D001646:Bile / Q000378:metabolism; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D005260:Female; D005506:Food Contamination; D008892:Milk / Q000378:metabolism*; D014255:Trichothecenes / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D014255:Trichothecenes; C048238:deepoxy-deoxynivalenol; C007262:deoxynivalenol