Studies on the iodine concentration of milk have also been
undertaken in other countries over recent years.25,26 The general
conclusion in all these studies is that the iodine composition in milk
varies greatly from one sample to another, that changes in the
concentration have occurred over time and that this variation has
not usually been the result of a policy of regulating the iodine
concentration in milk. A few of the causes of this variation are
known and common to all the studies. The iodine concentration is
higher in winter milk samples than in summer milk
simples.19,20,24,25 This variationwas also found in our study, though
it was not so marked as that of other studies.24,27 Another variation
found in our study was the greater iodine concentration detected in
skimmed milk; this, too, has been seen elsewhere, though it was
not commented on in the results.27 Nevertheless, the most
important variations in the concentration of iodine in milk are
random, as shown in our study, with wide variation found within
the same brands, with ranges above 100 mg/L. Iodine in cow’s milk
comes from the iodine consumed by the animal in fodder, as well as
the contamination of products used for disinfection and sterilization.
9e11 The milk that can be bought in commercial establishments
in Spain is pooled from several dairy farms. Thus, any high
iodine concentrations in milk from one farm will be diluted by
lower concentrations in milk from other farms. The differences in
iodine administration in veterinary practice may also explain part
of this variation.24
Populations affected by iodine deficiency should be considered
as more sensitive to the adverse effects of iodine intake, such as
a higher risk of both hyper- and hypothyroidism in the event of
acute or chronic exposure to high doses of iodide.
Therefore, in Europe, the Scientific Committee on Food
proposed an upper limit of iodine intake in the healthy population
and the upper iodine levels in feed for dairy cows is also regulated
according to the recommendations of animal nutrition scientists.28
Reducing iodine to a maximum of 4 mg/kg complete feed for dairy
cows would result in a satisfactory margin of safety for the
consumption of milk.
Studies on the iodine concentration of milk have also beenundertaken in other countries over recent years.25,26 The generalconclusion in all these studies is that the iodine composition in milkvaries greatly from one sample to another, that changes in theconcentration have occurred over time and that this variation hasnot usually been the result of a policy of regulating the iodineconcentration in milk. A few of the causes of this variation areknown and common to all the studies. The iodine concentration ishigher in winter milk samples than in summer milksimples.19,20,24,25 This variationwas also found in our study, thoughit was not so marked as that of other studies.24,27 Another variationfound in our study was the greater iodine concentration detected inskimmed milk; this, too, has been seen elsewhere, though it wasnot commented on in the results.27 Nevertheless, the mostimportant variations in the concentration of iodine in milk arerandom, as shown in our study, with wide variation found withinthe same brands, with ranges above 100 mg/L. Iodine in cow’s milkcomes from the iodine consumed by the animal in fodder, as well asthe contamination of products used for disinfection and sterilization.9e11 The milk that can be bought in commercial establishmentsin Spain is pooled from several dairy farms. Thus, any highiodine concentrations in milk from one farm will be diluted bylower concentrations in milk from other farms. The differences inไอโอดีนสัตวแพทย์ฝึกหัดบริหารยังอาจอธิบายส่วนของ variation.24 นี้ประชากรที่รับผลกระทบจากการขาดไอโอดีนควรเป็นมีความไวต่อการกระทบของที่บริโภคไอโอดีน เช่นมีความเสี่ยงสูงทั้งไฮเปอร์- และพร่องใน event ของเฉียบพลัน หรือเรื้อรังสัมผัสกับปริมาณสูงของไอโอไดด์ดังนั้น ในยุโรป คณะกรรมการวิทยาศาสตร์การอาหารเสนอการขีดจำกัดของปริมาณไอโอดีนในประชากรที่มีสุขภาพดีและยังมีควบคุมระดับบนไอโอดีนในอาหารสำหรับวัวนมตามคำแนะนำของอาหารสัตว์ scientists.28ไอโอดีนที่ลดลงสูงสุดไม่เกิน 4 มิลลิกรัม/กิโลกรัมอาหารสมบูรณ์สำหรับโคนมวัวจะผลกำไรเป็นที่พอใจของความปลอดภัยสำหรับการปริมาณของน้ำนม
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