Sulfur and Chlorine Play a Non-Acid Base Role in Periparturient Calcium Homeostasis

The increased risk of periparturient hypocalcaemia through offering high-K feeds in the precalving period has been reported previously. Two experiments (experiment 1 and 2) investigated the effect of KCl fertilizer on pasture mineral concentration, the dietary cation-anion difference (DCAD), and the...

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Veröffentlicht in:Journal of dairy science 2002-12, Vol.85 (12), p.3444-3453
Hauptverfasser: Roche, J.R., Morton, J., Kolver, E.S.
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creator Roche, J.R.
Morton, J.
Kolver, E.S.
description The increased risk of periparturient hypocalcaemia through offering high-K feeds in the precalving period has been reported previously. Two experiments (experiment 1 and 2) investigated the effect of KCl fertilizer on pasture mineral concentration, the dietary cation-anion difference (DCAD), and the subsequent effect of this on periparturient plasma and urine mineral status. Experiment 2 examined the effect of precalving Mg source (MgO, MgSO4, and MgCl2) and postcalving Ca supplementation on the concentration of Ca and Mg in plasma and urine. Unexpectedly, pasture DCAD increased (P = 0.06) from 434 to 535 mEq/kg DM in experiment 1 as pasture K concentration decreased from 4.2 to 3.5%, primarily because of a corresponding and greater decrease in pasture Cl concentration (from 1.9 to 1.3%). Plasma Ca or Mg concentrations were not affected by pasture K concentration. A linear decline (PMgO. Differences in acid-base balance do not explain the difference between Mg salts. These results indicate that precalving dietary S and Cl concentration plays an important role in Ca homeostasis, in addition to its role in acid-base balance. Supplementation with Ca postcalving increased plasma Ca concentration for 2 d postcalving. Milk production was not affected.
doi_str_mv 10.3168/jds.S0022-0302(02)74432-9
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Two experiments (experiment 1 and 2) investigated the effect of KCl fertilizer on pasture mineral concentration, the dietary cation-anion difference (DCAD), and the subsequent effect of this on periparturient plasma and urine mineral status. Experiment 2 examined the effect of precalving Mg source (MgO, MgSO4, and MgCl2) and postcalving Ca supplementation on the concentration of Ca and Mg in plasma and urine. Unexpectedly, pasture DCAD increased (P = 0.06) from 434 to 535 mEq/kg DM in experiment 1 as pasture K concentration decreased from 4.2 to 3.5%, primarily because of a corresponding and greater decrease in pasture Cl concentration (from 1.9 to 1.3%). Plasma Ca or Mg concentrations were not affected by pasture K concentration. A linear decline (P&lt;0.10) in urine Mg suggested a decline in Mg absorption as pasture K increased. In experiment 2, pasture DCAD decreased (P&lt;0.05) linearly from 403 to 350 mEq/kg DM as pasture K concentration decreased from 3.8 to 3.3%. However, precalving urine pH was not affected by the declining DCAD. Postcalving plasma Ca concentration was affected by precalving Mg source with MgSO4&gt;MgCl2&gt;MgO. Differences in acid-base balance do not explain the difference between Mg salts. These results indicate that precalving dietary S and Cl concentration plays an important role in Ca homeostasis, in addition to its role in acid-base balance. Supplementation with Ca postcalving increased plasma Ca concentration for 2 d postcalving. Milk production was not affected.</description><identifier>ISSN: 0022-0302</identifier><identifier>EISSN: 1525-3198</identifier><identifier>DOI: 10.3168/jds.S0022-0302(02)74432-9</identifier><identifier>PMID: 12512617</identifier><identifier>CODEN: JDSCAE</identifier><language>eng</language><publisher>Savoy, IL: Elsevier Inc</publisher><subject><![CDATA[Animal productions ; Animals ; Anions ; Biological and medical sciences ; Calcium - blood ; Calcium Carbonate - administration & dosage ; Cations ; Cattle - physiology ; Chlorine ; Chlorine - administration & dosage ; Diet ; dietary cation-anion difference ; Dietary Supplements ; Female ; Fertilizers ; Fundamental and applied biological sciences. 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However, precalving urine pH was not affected by the declining DCAD. Postcalving plasma Ca concentration was affected by precalving Mg source with MgSO4&gt;MgCl2&gt;MgO. Differences in acid-base balance do not explain the difference between Mg salts. These results indicate that precalving dietary S and Cl concentration plays an important role in Ca homeostasis, in addition to its role in acid-base balance. Supplementation with Ca postcalving increased plasma Ca concentration for 2 d postcalving. Milk production was not affected.</abstract><cop>Savoy, IL</cop><pub>Elsevier Inc</pub><pmid>12512617</pmid><doi>10.3168/jds.S0022-0302(02)74432-9</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; Elsevier ScienceDirect Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Animal productions
Animals
Anions
Biological and medical sciences
Calcium - blood
Calcium Carbonate - administration & dosage
Cations
Cattle - physiology
Chlorine
Chlorine - administration & dosage
Diet
dietary cation-anion difference
Dietary Supplements
Female
Fertilizers
Fundamental and applied biological sciences. Psychology
Homeostasis
Hydrogen-Ion Concentration
hypocalcaemia
Labor, Obstetric
magnesium
Magnesium - blood
Magnesium Chloride - administration & dosage
Magnesium Sulfate - administration & dosage
potassium
Potassium - analysis
Potassium Chloride - administration & dosage
Pregnancy
Sulfur
Sulfur - administration & dosage
Terrestrial animal productions
Urine
Vertebrates
title Sulfur and Chlorine Play a Non-Acid Base Role in Periparturient Calcium Homeostasis
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