Abstract
Summary
Six mature nonlactating Hol-stein cows were subjected to a test procedure of a sham period (saline injection) of 10 days that preceded and followed each 14 day TRH treatment period at 18.5 and 35°.
The objective of this study was to determine the effect of intramuscular injection of TRH (400 μg daily) on bovine plasma thyroxine levels at 18.5 and 35°. The results indicate that im administration of TRH is effective in elevating plasma thyroxine levels at botn 18.5 and 35°, but the response is diminished after 7 days at 18.5° and ineffective in sustaining or elevating plasma thyroxine levels in cattle after 6 days of TRH administration at 35°.
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