Reduction in P concentration from 3.4 to 2.3 g P/kg DM reduced DMI, milk yield,milk
protein yield and plasma Pi concentration, and increased serum concentration of CTX, but
did not affect serum concentration of OC inearly lactation. Reduced dietary P concentration from 3.4 to 2.8g P/kg DM didnotaffectDMIormilkproductioninearlylactation.Dry
matterintakeandmilkyieldwerenotaffectedbydietaryPconcentrationinlatelactation.
PlasmaCaincreasedinLP,whereastherewasnoeffectonserumconcentrationofPTHor
on plasmaconcentrationofvitaminD3 pre-partum, inearlyorlatelactation.Despitean
estimatedmobilizationofPinearlylactation,onthebasisofresultsofCTXandOC,itis
not possibletoreducePconcentrationfrom3.4to2.3gP/kgDMindairycowsinthis
periodwithoutcompromisingDMIandmilkproduction.Theresultsindicateapotential
for reducingPconcentrationinearlyandlatelactationfromthecurrentrecommendations
of 3.4to2.8gP/kgDMwithouteffectsonperformance,butthislevelofdietaryPmight
not allowforrepletionofbonePmobilizedinearlylactation
Reduction in P concentration from 3.4 to 2.3 g P/kg DM reduced DMI, milk yield,milkprotein yield and plasma Pi concentration, and increased serum concentration of CTX, butdid not affect serum concentration of OC inearly lactation. Reduced dietary P concentration from 3.4 to 2.8g P/kg DM didnotaffectDMIormilkproductioninearlylactation.DrymatterintakeandmilkyieldwerenotaffectedbydietaryPconcentrationinlatelactation.PlasmaCaincreasedinLP,whereastherewasnoeffectonserumconcentrationofPTHoron plasmaconcentrationofvitaminD3 pre-partum, inearlyorlatelactation.DespiteanestimatedmobilizationofPinearlylactation,onthebasisofresultsofCTXandOC,itisnot possibletoreducePconcentrationfrom3.4to2.3gP/kgDMindairycowsinthisperiodwithoutcompromisingDMIandmilkproduction.Theresultsindicateapotentialfor reducingPconcentrationinearlyandlatelactationfromthecurrentrecommendationsof 3.4to2.8gP/kgDMwithouteffectsonperformance,butthislevelofdietaryPmightnot allowforrepletionofbonePmobilizedinearlylactation
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