the effect of chronic oral thyrotrophin-releasing hormone ( trh ) administration on thyrotrophin ( tsh ) , l-triiodothyronine ( t3 ) and l-thyroxine ( t4 ) serum levels , pituitary tsh concentration and serum response to acute trh injection , has been studied in female rats under different thyroidal conditions : sham-operated control animals , and thyroidectomized animals receiving 25 micrograms l-t4/100 g body weight/day .
C0041014
l-triiodothyronine
C0040128
thyroidal conditions