?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Effects+of+grazing+system+on+production+and+parasitism+of+dairy+breed+heifers+and+steers+grazing+wet+marginal+grasslands&rft.creator=Kristensen%2C+T.&rft.creator=Thamsborg%2C+S.M.&rft.creator=Andersen%2C+H.R.&rft.creator=S%C3%83%C2%B8egaard%2C+K.&rft.creator=Nielsen%2C+L.&rft.subject=+Dairy+cattle&rft.description=Production+and+endoparasitism+in+first+grazing+season+of+Holstein+heifers+and+steers+were+investigated+in+two+grazing+seasons%2C+at+low-lying+peaty+soil.+In+year+2000%2C+forty+animals+were+included+in+a+2+x+2+factorial%2C+replicated+experiment+with+two+sexes+(steers+vs.+heifers)+and+two+stocking+rates+(SR)%3A+normal+vs.+low+(840+vs.+420+kg+live+weight+per+ha+at+turn+out)+in+a+set+stocking+grazing+system.+Mean+grass+height+over+the+entire+season+were+6.3+%C3%82%C2%B1+4.8+cm+(mean+%C3%82%C2%B1+s.d.)+at+normal+SR+and+9.8+%C3%82%C2%B1+6.1+cm+at+low+SR.+Mean+daily+live+weight+gain+during+grazing+was+significantly+(P+%3C+0.001)+lower+at+normal+SR+(256+%C3%82%C2%B1+147+g)+compared+to+low+(468+%C3%82%C2%B1+142+g)+but+sex+did+not+significantly+affect+the+daily+gain.+Serum-pepsinogen+levels%2C+indicating+uptake+of+gastrointestinal+nematodes%2C+were+higher+at+normal+SR+and+consistently+higher+in+steers+compared+to+heifers%2C+although+not+significant.+In+2001+the+experiment+included+80+animals+in+a+2+x+2+factorial+experiment+with+two+sexes+(steers+vs.+heifer)%2C+two+grazing+systems+(set+stocking+and+2-paddock+rotation)+and+four+replicates.+Pasture+quality+was+low%2C+average+DOM+57%25+and+13.9%25+crude+protein+in+DM+independent+of+grazing+system.+Mean+daily+live+weight+gain+was+not+significantly+affected+by+grazing+system.+A+tendency+(P%3D0.07)+to+lower+daily+gain+for+the+heifers+than+for+steers+was+observed+(427+%C3%82%C2%B1+161+g+vs.+474+%C3%82%C2%B1+138+g).+Lower+levels+of+pasture+contamination+with+parasites+were+observed+in+the+paddocks+spelled+up+to+mid+July+but+otherwise+rotation+did+not+prevent+parasite+infections.+%0D%0A%0D%0AIt+is+concluded+that+first+grazing+season+steers+and+heifers+have+the+same+potential+for+growth+when+grazing+at+marginal+areas+with+low+pasture+quality.+Set+stocking+or+the+two-paddock+rotation+scheme+did+not+affect+productivity+or+level+of+parasite+infection+at+the+end+of+season.+Parasite+infections+can+become+a+problem+at+high+SR.+SR+is+an+important+factor+for+both+daily+live+weights+gain+per+animal+and+total+production+per+ha.+However%2C+due+to+the+very+heterogeneous+structure+of+marginal+areas+there+is+a+need+for+other+indicators+than+kg+live+weight+per+ha+at+turn+out+in+order+to+defined+a+clear+relationship+between+stocking+rate+and+production.+%0D%0A&rft.date=2006&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F4514%2F1%2F4514.pdf&rft.identifier=Kristensen%2C+T.%3B+Thamsborg%2C+S.M.%3B+Andersen%2C+H.R.%3B+S%C3%83%C2%B8egaard%2C+K.+and+Nielsen%2C+L.+(2006)+Effects+of+grazing+system+on+production+and+parasitism+of+dairy+breed+heifers+and+steers+grazing+wet+marginal+grasslands.+Animal+Science+(82)%2C+pp.+201-211.&rft.relation=http%3A%2F%2Forgprints.org%2F4514%2F