ORIGINAL PAPER
Influence of an iodine depletion period and teat
dipping on the iodine concentration in serum and
milk of cows
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1
Institute of Animal Nutrition, Federal Agricultural Research Centre (FAL),
Bundesallee 50, D-38116 Braunschweig, Germany
2
Agricultural Research Centre of Thuringia,
Ricarda-Huch-Weg 20, D-07743 Jena, Germany
Publication date: 2007-02-02
Corresponding author
G. Flachowsky
Institute of Animal Nutrition, Federal Agricultural Research Centre (FAL),
Bundesallee 50, D-38116 Braunschweig, Germany
J. Anim. Feed Sci. 2007;16(1):18-25
KEYWORDS
ABSTRACT
The objectives of the study were to investigate the influence of an iodine depletion period (from
10 to 0.2 mg Ι per kg dry matter, DM) on the iodine concentration of serum and milk and the effect
of an iodized udder disinfectant solution on the iodine concentration of milk from dairy cows. Five
late-lactating cows (milk performance: 22.1±2.0 kg per day) were used for the study. At the end of
the dose-response study (up to 10 mg I supplementation per kg DM) without teat dipping, the basal
diet (0.2 mg I/kg DM) was given for 16 days. The serum iodine concentration decreased from 290
to ≈ 60 µg kg-1 , that of milk, from 2762 to ≈ 100 µg kg-1. In the second part of the study the teats
were separately dipped twice a day after milking in a disinfectant providing a free available iodine
concentration of 3 g per l through nonoxinol(9)-iodine. The diet fed had a native iodine content
of 0.2 mg/kg DM. Dipping was compared over 18 days with non-dipping. The dipping procedure
significantly increased the mean iodine concentration from 100±23 to 154±42 µg kg-1 milk.
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