Effect of Mild Hyperthyroidism upon Secretion of I¹³¹ in Milk of Dairy Cattle

Journal Article · Tue Oct 31 23:00:00 EST 1961 · Journal of Dairy Science

DOI:https://doi.org/10.3168/jds.S0022-0302(61)90016-9· OSTI ID:4755429

Premachandra, B. N.; Turner, C. W.

Lactating dairy cows were administered 100 mu C I¹³¹ intrajugularly, amd samples of milk were analyzed daily for 5 days. During the 1st 24 hr 4.9 to 7.2% of the injected dose of I¹³¹ appeared in the milk, with a mean of 5.8%. During the 5-day period, the total mean percentage of the injected dose increased to 8.2, with a range of 6.9 to 9.2%. The tests were in the same cows during treatment with thyroxine equal to 50% more than the individual winter thyroxine secretion rate. Although daily milk secretion increased 22%, the mean per; entage of injected I¹³¹ appearing in milk during the 1st 24 hr was reduced to 2.9, with a range of 1.9 to 3.9%. The mean total percentage of I¹³¹ appearing in milk during 5 days was 4.8, with a range of 3.4 to 6.0%. Decline in I¹³¹ in the milk followed an exponential course in both experiments. Mild hyperthyroidism thus reduced the I¹³¹ secretion in milk 50% the first 24 hr, and 41% during the 5-day period. Thus dairy cattle transferred relatively small amounts of I¹³¹ to their milk and this amount was further reduced by mild hyperthyroidism. (H.H.D.)

• Research Organization: Univ. of Missouri, Columbia
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-005721
• OSTI ID: 4755429
• Journal Information: Journal of Dairy Science, Journal Name: Journal of Dairy Science Journal Issue: 11 Vol. 44; ISSN 0022-0302
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CATTLE
DISEASES
HORMONES
HYPERTHYROIDISM
IODINE 131
MILK
PHYSIOLOGY
QUANTITATIVE ANALYSIS
QUANTITY RATIO
THYROID
THYROXINE
TRACER TECHNIQUES