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Scholljegerdes, E. J., Lekatz, L. A. and Vonnahme, K. A. 2011. Effects of short-term oilseed supplementation on reproductive performance in beef heifers. Can. J. Anim. Sci. 91: 221–229. The objective of this experiment was to evaluate the role of a short-term increase in linolenic acid around the timed artificial insemination (TAI) on plasma fatty acid concentrations, estrous behavior, and pregnancy. Therefore, 96 cross-bred heifers (Initial BW=394±18.1 kg) fed chopped grass hay were allotted to one of three dietary treatments: no supplement (CON); 1.8 kg head−1 d−1 (DM basis) of a soybean-based pellet (SOY) high in linoleic acid (C18:2n-6); or 1.5 kg head−1 d−1 (DM basis) of a flaxseed-based pellet (FLX) high in linolenic acid (C18:3n-3). On day −9, relative to TAI, supplementation began, and heifers received a controlled internal drug-releasing (CIDR) device and gonadotropin releasing hormone (GnRH; 100 µg). On day −2, CIDRs were removed and heifers received 25 mg prostaglandin F2α (PGF2α). Heifers were bred by TAI (day 0) 54 h after CIDR removal and received GnRH. Estrous behavior was monitored throughout the feeding period by radiotelemetry. Supplementation ended on day 18 relative to TAI. Plasma concentrations of C18:2n-6 were greater by day 0 and day 18 (P

Vonnahme,K.A.,Zimprich,R.C.,Harris,E.K.,Berg,E.P.,Newman,D.J.andBuchanan,D.S.2010.Linseedmealduringearlypregnancyincreaseslittersizeinpigswithoutaffectingpost-natalgrowth.Can.J.Anim.Sci.90:491 493.Todeterminehowfeedinglinseedmeal(LSM)duringgestationinfluenceslittersize,placentalweight,andpigletgrowth,sows(n 30) received a phytoestrogen-free Control diet throughout gestation; 12.5% LSM diet throughout gestation(LSM114);or12.5%LSMdietfromday1today15ofgestationandcontroldietuntilparturition(LSM15).Maternaldietdidnotaffectbirthweight,placentalweight,orpostnatalgrowth.Thenumberoffullyformedpigletswasincreased(P 0.05)inLSM15sowscomparedwithControlandLSM114sows(13.5vs.10.1and11.691.0,respectively).FeedingLSMduringthefirst2wkafterbreedingmayenhancelittersize.Key words: Littersize,linseedmeal,pigVonnahme,K.A.,Zimprich,R.C.,Harris,E.K.,Berg,E.P.,Newman,D.J.etBuchanan,D.S.2010.Letourteaudelinende´butdegrossesseaugmentelatailledesporte´eschezlesporcssansaffecterlacroissancepost-natale.Can.J.Anim.Sci.90:491 493.Afindede´terminercommentnourritureavecfarinedesgrainesdelin(LSM)pendantlagestationinfluencetaille de litie`re, poid placentaire, et croissance des porcelets, truies (n 30) ont recu un re´gime de controˆle sans-phytoestrogenpendanttoutelagestation;alimentationLSMde12,5%toutesagestation(LSM114);ou12,5%LSMDie`tedejour1a`15dure´gimedegestation,etcontroˆlejusqu’a`laparturition(LSM15).Alimentationmaternellen’affectaitpasnaissance, poids placentaire ou croissance postnatale. Porcelets entie`rement forme´se´te´augmente´es (P 0,05) dans lestruies LSM15 par rapport a`la commande et LSM114 truies (13,5 VS 10.1 et 11,691.0, respectivement). AlimentationLSMpendantlesdeuxpremie`ressemainesapre`sreproductionpeutame´liorerlatailledelalitie`re.Mots cle´s: Tailledelitie`re,farinedesgrainesdelin,porc