title: Influence of linoleic/linolenic acid ratio in the diet of periparturient cattle on plasma concentrations of PGF2 alpha metabolite and placental expulsion rate.
abstract: Forty-eight cows Holstein Friesian x Dutch Friesian (HF x DF) were randomly assigned to 2 groups fed 1 of 2 diets (isocaloric and isonitrogenous but different in linoleic/linolenic acid ratio) from 4 wk before expected parturition until 7 d after calving. Effects of the diet on plasma linoleic/linolenic acid ratio, plasma PGFM levels and placental explusion rate were studied. Dietary treatment resulted in significant differences in linoleic/linolenic acid ratio in blood plasma (1.00 +/- .22 vs 4.41 +/- .53). The placental expulsion rate was not significantly different between the 2 treatment groups. Plasma PGFM levels, as analyzed for 28 cows from 30 d before parturition until 1.5 d after parturition, were similar for the diets. Cows with a longer placental expulsion rate had lower PGFM levels at parturition (for instance, placental expulsion rate shorter (n = 11) and longer (n = 17) than 6 h, 1248 vs 2965 pg/ml, residual standard deviation 1185 pg/ml, P < 0.01). The results show that the dietary linoleic/linolenic acid ratio can influence the plasma linoleic/linolenic acid ratio without affecting the placental expulsion rate or plasma PGFM levels around parturition.
authors.affiliation: Wageningen Institute of Animal Sciences, Wageningen Agricultural University, The Netherlands.
authors.forename: B
authors.initials: B
authors.lastname: Kemp
authors.forename: N M
authors.initials: NM
authors.lastname: Soede
authors.forename: M
authors.initials: M
authors.lastname: Kankofer
authors.forename: M
authors.initials: M
authors.lastname: Bevers
authors.forename: M A
authors.initials: MA
authors.lastname: Taverne
authors.forename: T
authors.initials: T
authors.lastname: Wensing
authors.forename: J P
authors.initials: JP
authors.lastname: Noordhuizen
mesh_terms: D000818:Animals; D002417:Cattle; D004042:Dietary Fats, Unsaturated; D015237:Dinoprost / Q000031:analogs & derivatives / Q000097:blood*; D005260:Female; D007743:Labor, Obstetric / Q000502:physiology*; D019787:Linoleic Acid; D008043:Linseed Oil; D010920:Placenta / Q000502:physiology*; D010938:Plant Oils; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology*; D000074242:Sunflower Oil; D017962:alpha-Linolenic Acid
chemical_list: D004042:Dietary Fats, Unsaturated; D010938:Plant Oils; D000074242:Sunflower Oil; D017962:alpha-Linolenic Acid; D008043:Linseed Oil; D019787:Linoleic Acid; D015237:Dinoprost