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Magnesium metabolism in the dairy cow. I. Metabolism on stall rations

Published online by Cambridge University Press:  27 March 2009

J. A. F. Rook ,
C. C. Balch  and
C. Line
J. A. F. Rook
Affiliation:
National Institute for Research in Dairying, Shinfleld, near Reading
C. C. Balch
Affiliation:
National Institute for Research in Dairying, Shinfleld, near Reading
C. Line
Affiliation:
National Institute for Research in Dairying, Shinfleld, near Reading
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Extract

1. The results are reported of a series of 8-day magnesium metabolism trials carried out with milking cows fed a variety of typical winter stall rations.

2. Twelve cows fed a standard ration of 15 lb. hay plus 12 lb. of a concentrate mixture containing 3 parts dredge corn, 1 part bran, 1 part decorticated groundnut meal and 1 lb./cwt. Churn 105 minerals, showed variations in the proportion of the feed magnesium excreted in the faeces of from 66·53 to 76·98%, probably reflecting individual differences in the capacity of animals to absorb magnesium.

3. Wide differences in the utilization of the magnesium in typical winter rations were observed. Mean values, with a standard error, obtained for the proportion of the feed magnesium excreted in the faeces with various types of ration were as follows: hay plus concentrates, 71·48 ± 0·94; hay plus proprietary dairy cubes, 62·15 ± 2·73%; hay, proprietary dairy cubes plus decorticated groundnut meal, 91·98 ± 1·93%; hay, silage (1) plus concentrates, 79·53 ± 0·99%; hay, silage (2) plus concentrates, 74·07 ± 4·24%; hay, mangolds plus concentrates, 74·28 ± 5·91%.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 51 , Issue 2 , October 1958 , pp. 189 - 198
Copyright
Copyright © Cambridge University Press 1958

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