title: Dietary supplementation with safflower seeds differing in fatty acid composition differentially influences serum concentrations of prostaglandin F metabolite in postpartum beef cows.
abstract: Synthesis and secretion of prostaglandin F2alpha (PGF2alpha) is elevated following parturition and exerts divergent effects on the re-establishment of fertile estrous cycles in cows. The objective of these experiments was to determine if oil seed supplements differing in fatty acid composition differentially influence serum concentrations of the specific PGF2alpha metabolite, PGFM. Safflower seed supplements were formulated to provide 5% of dry-matter intake as fat. In Trial 1, 24 multiparous beef cows were individually fed control (beet pulp-soybean meal) or cracked high-linoleate safflower seed (78% 18:2n-6) supplements for 80 d postpartum. Linoleate supplemented cows had greater (P < 0.001) serum concentrations of PGFM than control cows. In Trial 2, primiparous beef cows (n = 36) were individually fed control (cracked corn-soybean meal), cracked high-linoleate (76% 18:2n-6) or -oleate (72% 18:1n-9) safflower seed supplements for 92 d postpartum. As in Trial 1, serum concentrations of PGFM were greater (P < or = 0.04) in linoleate than control or oleate supplemented cows. Serum concentrations of PGFM, however, did not differ (P = 0.40) among oleate and control supplemented cows. Although potential impacts on reproductive performance remain to be proven, dietary oil supplements high in linoleate, but not oleate, increased serum concentrations of PGFM compared to control supplements.
authors.affiliation: University of Wyoming Department of Animal Science, Laramie 82071, USA. gm@uwyo.edu
authors.forename: Mark H J
authors.initials: MH
authors.lastname: Grant
authors.forename: Brenda M
authors.initials: BM
authors.lastname: Alexander
authors.forename: Bret W
authors.initials: BW
authors.lastname: Hess
authors.forename: Jeff D
authors.initials: JD
authors.lastname: Bottger
authors.forename: Doug L
authors.initials: DL
authors.lastname: Hixon
authors.forename: Edward A
authors.initials: EA
authors.lastname: Van Kirk
authors.forename: Terry M
authors.initials: TM
authors.lastname: Nett
authors.forename: Gary E
authors.initials: GE
authors.lastname: Moss
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D031187:Carthamus tinctorius / Q000737:chemistry* / Q000378:metabolism; D002417:Cattle / Q000097:blood*; D019587:Dietary Supplements; D015237:Dinoprost / Q000097:blood* / Q000378:metabolism; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D049590:Postpartum Period; D011897:Random Allocation; D012639:Seeds / Q000737:chemistry* / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D015237:Dinoprost