A comparison of tritiated and iodinated tracers in the radioimmunoassay of progesterone in cow milk

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Abstract
Progesterone levels in the milk of cows were determined by 2 radioimmunoassay methods. Excellent correlation (r [correlation coefficient] = 0.95) was found between the method using an iodinated radioligand and that using a conventional tritiated tracer. Determination of milk progesterone levels by radioimmunoassay provide an early indication of pregnancy status in the cow.