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Rapeseed glucosinolates and iodine in sows affect the milk iodine concentration and the iodine status of piglets*

  • Friedrich Schöne (a1), Matthias Leiterer (a1), Horst Hartung (a1), Gerhard Jahreis (a2) and Frank Tischendorf (a2)...


I in the chain sow diet → blood serum of sow → sow milk → piglet serum was investigated in two experiments with a total of eighty-one sows and their piglets. In experiments conducted during the last trimester of gravidity and the 28 d of lactation, diets with glucosinolates (1.9 mmol/kg diet via 100 g ground rapeseed/kg diet (Expt 1) and 2.1 and 4.2 mmol/kg diet via 75 and 150 g rapeseed press cake/kg diet (Expt 2)) were compared with control groups without rapeseed products. From 0 to 600 μg I/kg was added to sow diets during lactation. Diets without supplementary I decreased the I concentration particularly in milk and piglet serum. The presence of rapeseed and rapeseed press cake were indicated by a thiocyanate concentration increase, mainly in sow serum. The diets with glucosinolates decreased the milk and piglet serum I concentration. Spot urine and faeces samples from sows eating the rapeseed-press cake diets had increased I concentration. The sows’ serum I and thyroxine did not respond to glucosinolates (Expt 1) or these diets caused an increase in concentration (Expt 2). Both these criteria seem unsuitable for the diagnosis of I status of adult animals. Glucosinolates and their degradation compounds may affect the thyroid and the mammary glands resulting in lower I milk transfer and higher renal and intestinal I excretion.


Corresponding author

Corresponding author: Dr Friedrich Schöne, fax +49 3641 463 630, email


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Presented in part at the 3rd international workshop on 'Antinutritional factors in legume seeds and rapeseed', Wageningen, the Netherlands (Schöne et al. 1998b).



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