Influence of Thyroid Status On Synthesis And Release of Gonadotrophing In Male Rabbits

It is generally accepted that normal reproductive performance in animals is closely associated with normalthyroid activi ty. However, the mode of action of thyroids on the gonads is :rather conflicting and confused. It is not yet clear whether the effect of thyroids is directly on the gonads or indir-ectly through the pituitary gland.For this reason, the presbetween thyroid activity and gonadotrophins in wale rabbi ts.Fifty mature male Baladi rabbits of an average weight of 1500 g were used. Food and water were provided ad ~ibitum. The daily food intake per rabbit was determined and was found to be 60 g. The requested doses of test material were mixed with the ration. rabbits of the ;first group were fed the ordinary ration and were considered as control. The second group wasfed 12 ug and the third group received 25 ug I-thyroxine per rabbit daily. The fourth group was fed a diet con-taining 60 mg , and the fifth group received 120 mg ofpropylethiouracil per rabbit daily.