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Statistical research on the fate of dietary mineral elements in dry and lactating cows V. Potassium

Published online by Cambridge University Press:  27 March 2009

R. Paquay ,
F. Lomba ,
A. Lousse  and
V. Bienfet
R. Paquay
Affiliation:
Faculty of Veterinary Medicine, Cureghem, Brussels, Belgium
F. Lomba
Affiliation:
Faculty of Veterinary Medicine, Cureghem, Brussels, Belgium
A. Lousse
Affiliation:
Faculty of Veterinary Medicine, Cureghem, Brussels, Belgium
V. Bienfet
Affiliation:
Faculty of Veterinary Medicine, Cureghem, Brussels, Belgium
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Summary

Statistical analyses were carried out on the data obtained under strictly controlled conditions in metabolism stalls with 41 different rations fed to 127 adult non-pregnant dry cows, and with 14 other different rations fed to 35 adult non-pregnant lactating cows that had calved 2–6 months earlier and whose daily milk production ranged from 11 to 20 kg.

The authors have calculated and studied the correlations between faecal and urinary potassium losses, potassium excretion in the milk, digestible potassium and potassium balance, and the 75 other nutritive factors which were analysed for each of the 55 above mentioned experimental diets.

The results show that three nutritional factors, potassium, dry-matter and nitrogen intakes, influence the fate of dietary potassium. The apparent digestibility of potassium is hyperbolically related to potassium content of the diet since the true digestibility of potassium is very high, unrelated to potassium intake and rather constant and since about 2·2 g of endogenous potassium are excreted in the faeces per kg of ingested dry matter.

The quantities of digestible potassium strongly influence both the potassium urinary outputs and potassium balance. An increase in digestible dry matter enhances too the urinary potassium excretion as well as faecal output and lower potassium balance twice as much.

But the most interesting feature in the potassium metabolism is that at any level, ingestion, digestion, excretion, there is a very close correlation between potassium and nitrogen.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 73 , Issue 3 , December 1969 , pp. 445 - 452
Copyright
Copyright © Cambridge University Press 1969

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References

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