Iodine in milk and meat of dairy cows fed different amounts of potassium iodide or ethylenediamine dihydroiodide.
Relationships between I intake by lactating Holstein cows and iodine concentrations in milk and meat were investigated. Six treatment groups with seven cows assigned to each treatment were fed a basal diet containing .8 mg I/kg alone or supplemented with I at 1, 2, or 4 mg/kg in four 5-wk periods. Basal alone was fed in the first and third periods and the I supplement was potassium iodide in the second period and ethylenediamine dihydroiodide in the fourth period. Iodine concentrations in milk increased with each increase in dietary I from 205 ng/ml for basal periods to 404, 477, and 757 ng/ml when 1, 2, or 4 mg/kg I was fed as potassium iodide; and 467, 535, and 869 ng/ml when 1, 2, or 4 mg/kg I was fed as ethylenediamine dihydroiodide. Concentrations of I in skeletal muscle after the fourth period were not affected by 2 mg/kg I and only increased from 166 to 199 ng/g when supplemental I was 4 mg/kg. Moderate changes in dietary I are quickly reflected in milk I, but I in meat is relatively stable.
Swanson
E W
EW
University of Tennessee, Knoxville 37901.
Miller
J K
JK
Mueller
F J
FJ
Patton
C S
CS
Bacon
J A
JA
Ramsey
N
N
D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage* / Q000378:metabolism; D002417:Cattle / Q000378:metabolism*; D004032:Diet; D005029:Ethylenediamines / Q000008:administration & dosage / Q000378:metabolism; D005260:Female; D005506:Food Contamination; D007454:Iodides / Q000008:administration & dosage* / Q000378:metabolism; D007455:Iodine / Q000032:analysis*; D016018:Least-Squares Analysis; D008460:Meat / Q000032:analysis*; D008892:Milk / Q000032:analysis*; D009132:Muscles / Q000032:analysis; D011193:Potassium Iodide / Q000008:administration & dosage / Q000378:metabolism; D011897:Random Allocation; D012044:Regression Analysis; D013963:Thyroid Hormones / Q000097:blood
D000890:Anti-Infective Agents; D005029:Ethylenediamines; D007454:Iodides; D013963:Thyroid Hormones; D011193:Potassium Iodide; C031234:ethylenediamine; D007455:Iodine