Hypomagnesaemia in milking cows: intake and utilization of magnesium from herbage by lactating cows.

Authors

  • A. Kemp
  • W.B. Deijs
  • O.J. Hemkes
  • A.J.H. van Es

DOI:

https://doi.org/10.18174/njas.v9i2.17628

Abstract

During 1958-60, 11 Mg balance trials were carried out with 39 lactating Friesian cows, which were fed indoors on a winter ration in 1 trial or on herbage freshly cut from pastures with different fertilizer treatments in the other trials. Average daily Mg intake was 33.08 g. for the winter ration and 16.62 g. for herbage, 17% of which was 'available', i.e. absorbed. Average Mg excretion in urine was 1.77 g., Mg excretion in milk 1.77 g./cow with an average content of 0.12 g./kg. milk, and Mg retention -0.5 g. Hypomagnesaemia occurred only when Mg excreted in urine was <1 g./day. The daily requirement of 'available' Mg was found to be 2.5 g- + 0.12 g-/kg' milk. Mg utilization was improved as herbage matured and the 'availability' increased, although there was a slight decrease in Mg content of the milk. (See D.S.A. 23 [734].)

M.P.H. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Published

1961-05-01

Issue

Vol. 9 No. 2 (1961)

Section

Papers

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