Urinary calcium excretion in non-lactating dairy cows in relation to intake of fat-coated rice bran

J. Martin-Tereso, M. Derks, H. van Laar, K. Mulder, L.A. den Hartog, M.W.A. Verstegen

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7 Citations (Scopus)


At calving, many older cows fail to compensate the sudden demand of calcium by an adequate activation of intestinal absorption. This results in a variable degree of hypocalcaemia. Reducing intestinal availability of calcium during the close-up period can prevent milk fever. Fat-coated rice bran (FCRB) was investigated for its potential to reduce Ca availability in pre-calving cows. Fat-coated rice bran was incubated in situ to estimate ruminal degradation of dry matter and phytic acid. Also, seven dry multiparous dairy cows were used for a feeding trial in three periods of approximately 1 week each: P1: adaptation; P2: feeding of 2 kg of FCRB and P3: withdrawal of FCRB. Feed intake was recorded and daily urine samples were analysed for pH, Ca and creatinine. The bypass fraction of phytic acid (passage rate: 5%/h) was 30%. Fat-coated rice bran depressed dry matter intake in P2, resulting in a lower Ca intake. In P2 urine pH and calcium excretion were lower. Daily calcium excretion decreased after introduction of FCRB, peaked after withdrawal and dropped 2 days later. Changes in urinary Ca excretion by feeding FCRB indicate that FCRB affected Ca homeostasis in dry multiparous dairy cows
Original languageEnglish
Pages (from-to)129-136
JournalJournal of Animal Physiology and Animal Nutrition
Issue number1
Publication statusPublished - 2010


  • cation-anion difference
  • milk fever
  • dry period
  • gastrointestinal-tract
  • parturient paresis
  • hypocalcemia
  • absorption
  • magnesium
  • supplementation
  • phosphorus

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