Influence of Various Protein Diets on the Incorporation of I131 in the Thyroid Gland of the Rat
Rats were fed diets containing various proteins in different amounts for 8 to 25 days. They were then fasted for 2 hr and injected intraperitoneally with 1 C I131 Four hr later thyroid protein was isolated and its activity counted. The highest I131 uptake values were obtained in rats fed a 30% Torula yeast diet. The uptake was only half as high in rats fed a standard diet containing 13% protein or diets containing 15% casein, legumes, or no protein at all. The uptake was 70 to 80% as high, compared with the 30% yeast diet, with diets containing 15% Torula yeast + methionine or + cystine, 15% skim milk, or 16% gelatin. I131 uptake showed seasonal variations, being st run. Concent 40% lower from May to October than from January to February, when the Torula yeast diet was fed. The seasonal difference was less marked (20%) when the skim milk diet was used. Although no close correlation was found between the biological value of the proteins tested and their abiiity to stimulate thyroid I131uptake, it is likely that amino acid imbalance may be responsible for the lower uptake values with some proteins. (H.H.D.)
- Research Organization:
- Humboldt Universitat, Berlin
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-023070
- OSTI ID:
- 4725952
- Journal Information:
- Z. Ernaehrungswiss, Journal Name: Z. Ernaehrungswiss Vol. Vol: 2
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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