Posibble Association of markers on bovine chromosome 5 with growth and fat traits in Hereford cattle raised under extensive conditions.

ROGBERG,-MUÑOZ A. PRANDO A., MELUCCI L., VILLEGAS CASTAGNASSO E., RIPOLI MV., PERAL-GARCIA P., BALDO A., AÑON C., GIOVAMBATTISTA G.

LIVESTOCK SCIENCE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2010 vol. 132 p. 186 - 188

1871-1413

Bovinechromosome5hasbeenwidelystudiedbecauseseveralQTLshavebeendetectedthere,inparticularforgrowthandfattraits.Eventhoughmostofthebeefisproducedunderpasturebasedconditions,onlylittleresearchhasfocusedonthiskindofsystems.TwoQTLregions,neighboringtheMyogenicfactor5gene,andInsulin-likeGrowthFactor1(IGF1)gene,wereselected.Withinthem,fourBTA5microsatellites(BP1,ETH10,IGF1andRM029)wereusedtoestablishtheirassociationwithgrowthandfattraitsinapasturebasedfeedingsystem.TheEstimatedBreedingValuestestedwere:400(W400)and600DaysWeight(W600),RibEyeArea(REA),RibFat,RumpFat,andIntraMuscularFat.Forgrowthtraitssignificantassociations(p≤0.05)betweenBP1andREA,andbetweenIGF1andW600,weredetected.Forfattraitssignificantassociation(p≤0.05)betweenETH10andRibFatandRumpFatwasdetected.Whenconsideringapairofclosermarkergenotypes,IGF1/ETH10wassignificantlyassociated(p≤0.05)withW400andW600.TheseresultsshowthatQTLforgrowthandfattraitsthatwerepreviouslyreportedintworegionsofBTA5,arealsoexpressedinacommercialpasturebasedsystem,whereanimalsarenotalwaysfedtoexpresstheirmaximumgeneticpotential.