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document
Effects of reducing dietary [ ( Na+ + K+ ) - ( Cl- + SO4= ) ] on the rate of calcium mobilisation by dairy cows at parturition . The effects of feeding diets with different milliequivalents ( meq ) of dietary [ ( Na+ + K+ ) - ( Cl- + SO4= ) ] to dairy cows during the last seven weeks of pregnancy on their acid-base status and calcium mobilisation rate around parturition were studied . Ten monozygotic twin pairs of pregnant cows ( five pairs of parity 1 or 2 , and five pairs of parity 3 or more ) were allocated to two diets which were formulated to provide either -4 meq ( anion diet ) or +572.5 meq ( cation diet ) of [ ( Na+ + K+ ) - ( Cl- + SO4= ) ] kg-1 dietary dry matter ( DM ) . The daily rations consisted of 4 kg grass hay and 7 kg concentrates . Changes in meq of dietary [ ( Na+ + K+ ) - ( Cl- + SO4= ) ] were achieved by adding KCl , K2SO4 and ( NH4 ) 2SO4 ( anion diet ) or K2CO3 ( cation diet ) to basal concentrates . Plasma calcium concentration and blood acid-base parameters were not affected by dietary treatment . However , urinary calcium excretion was markedly higher and urinary pH and bicarbonate excretion significantly lower in cows fed the anion diet than in cows fed the cation diet . The responses to hypocalcaemia induced by an intravenous infusion of EDTA solution were similar in the cows fed either diet .
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Intervention_Pharmacological
reducing dietary [ ( Na+ + K+ ) - ( Cl- + SO4= ) ]
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Intervention_Pharmacological
[ ( Na+ + K+ ) - ( Cl- + SO4= ) ]
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Intervention_Pharmacological
-4 meq ( anion diet ) or +572.5 meq ( cation diet ) of [ ( Na+ + K+ ) - ( Cl- + SO4= ) ] kg-1 dietary dry matter ( DM ) .
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Intervention_Pharmacological
grass hay and
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Intervention_Pharmacological
concentrates .
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Intervention_Pharmacological
[ ( Na+ + K+ ) - ( Cl- + SO4= ) ]
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Intervention_Pharmacological
KCl , K2SO4 and ( NH4 ) 2SO4 ( anion diet ) or K2CO3 ( cation diet )
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Intervention_Pharmacological
anion diet
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Intervention_Pharmacological
cation diet .
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Outcome_Physical
dietary [ ( Na+ + K+ ) - ( Cl- + SO4= ) ]
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Outcome_Physical
Plasma calcium concentration
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Outcome_Physical
blood acid-base parameters
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Outcome_Physical
urinary calcium excretion
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Outcome_Physical
urinary pH and bicarbonate excretion
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Participant_Condition
dairy cows at parturition .
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Participant_Condition
dairy cows during the last seven weeks of pregnancy