?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=https%3A%2F%2Forgprints.org%2Fid%2Feprint%2F48709%2F&rft.title=Chemical+composition+of+lamina+and+sheath+of+Lolium+perenne+as+affected+by+herbage+management&rft.creator=Hoekstra%2C+N.J.&rft.creator=Struik%2C+P.C.&rft.creator=Lantinga%2C+E.A.&rft.creator=Schulte%2C+R.P.O.&rft.subject=%22Organics%22+in+general&rft.description=The+quality+of+grass+in+terms+of+form+and+relative+amounts+of+energy+and+protein+affects+both+animal+production+per+unit+of+intake+and+nitrogen+(N)+utilization.+Quality+can+be+manipulated+by+herbage+management+and+choice+of+cultivar.+The+effects+of+N+application+rate+(0%2C+90+or+390+kg+N+ha%C2%BF1+year%C2%BF1)%2C+duration+of+regrowth+period+(2%C2%BF3%2C+4%C2%BF5%2C+or+6%C2%BF7+weeks)%2C+and+cutting+height+(8+or+12+cm)+on+the+mass+fractions+of+nitrogen+(N)%2C+water-soluble+carbohydrates+(WSC)%2C+neutral+detergent+fibre+(NDF)%2C+acid+detergent+fibre+(ADF)%2C+lignin+and+ash+in+lamina+and+sheath+material+of+a+high-sugar+(Aberdart)+and+a+low-sugar+(Respect)+perennial+ryegrass+(Lolium+perenne)+cultivar%2C+were+studied+in+a+factorial+field+experiment+during+four+seasons+in+2002+and+2003.+Expressing+NDF+and+ADF+mass+fractions+in+g+per+kg+WSC-free+dry+matter+(DM)+increased+the+consistency+of+treatment+effects.+The+high-sugar+cultivar+had+generally+higher+WSC+mass+fractions+than+the+low-sugar+cultivar%2C+especially+during+the+late+season.+Moreover%2C+the+relative+difference+in+WSC+mass+fraction+between+the+two+cultivars+tended+to+be+higher+for+the+lamina+material+than+for+the+sheath+material%2C+which+suggests+that+the+high-sugar+trait+may+be+more+important+under+grazing+conditions%2C+when+lamina+forms+the+bulk+of+the+intake%2C+than+under+mowing+regimes.+Longer+regrowth+periods+and+lower+N+application+rates+increased+WSC+mass+fractions+and+decreased+N+mass+fractions%3B+interactions+between+regrowth+period+and+N+application+rate+were+highly+significant.+The+mass+fractions+of+NDF+and+ADF+were+much+less+influenced.+The+NDF+mass+fraction+in+terms+of+g+per+kg+WSC-free+DM+tended+to+be+higher+at+lower+N+application+rates+and+at+longer+regrowth+periods.+The+effect+of+cutting+height+on+herbage+chemical+composition+was+unclear.+In+conclusion%2C+high-sugar+cultivars%2C+N+application+rate+and+length+of+the+regrowth+period+are+important+tools+for+manipulating+herbage+quality.&rft.date=2007&rft.type=Newspaper+or+magazine+article&rft.type=NonPeerReviewed&rft.identifier=+++Hoekstra%2C+N.J.%3B+Struik%2C+P.C.%3B+Lantinga%2C+E.A.+and+Schulte%2C+R.P.O.++++(2007)+Chemical+composition+of+lamina+and+sheath+of+Lolium+perenne+as+affected+by+herbage+management.+++NJAS+%3A+Wageningen+journal+of+life+sciences+%2F+Royal+Society+for+Agricultural+Sciences%2C+2007%2C+55+(1)%2C+55+-+74.++++++++