There are different factors that affect the metabolism, amount and size of muscles, the general size and many other features of living things, and in particular animals. A research was taken whose objective was to find the relevance and significance of the reproductive organs on these features. The research was based on the features that were observed from rats. The research based its finds on two categories of rats; castrate and normal productive rats. In the research, three hormones were identified and used as the points of reference in the findings. These hormones were Thyrotropin releasing hormone (TRH), LH, and, Testosterone that were identified as hormones 1, 4 and 6 respectively in the study. This naming was done specifically for the study.
According to the research, there was no significance effect on the overall metabolism in both castrate and intact rats. The hormone TRH whose work is to stimulate thyroid gland to produce T3 (Triiodothyronine) and T4 (Thyroxine), was discovered not be attached to the reproductive system. The only notable difference was the reduced size of testes in the castrate rats. This was explained as T4 increased production of basal metabolic rate which in return leads to the decrease of testosterone in the body. TRH was found responsible for hyperthyroidism which caused loss in body weight. This also was for both castrate and intact rats.
The effect of LH
LH was found to be significant in production of testosterone. Production of testosterone in effect leads to increase in testes, prostate, and seminal vesicles. Thus, the size of intact rats was bigger as compared to that of castrate rats. The castrate rats did not produce testosterone which meant that the presence of hormone LH identified as hormone 4 in the research was irrelevant. Presence of this hormone did not lead to change in the general size and muscle size of rats.
The effect of hormone Testosterone (hormone 6)
Hormone 6 lead to increase in weight of seminal vesicles, prostate gland and body weight in both castrate and intact rats. The later was identified as a result of increase production of muscles caused by the hormone. Testosterone was observed not to have any negative effect on the endogenous testosterone. According to the research, the amount of the hormone produced was too little to have such an effect. The research observed that in general, male rats had more muscles than the female rats. However, the presence of hormone 6 leads to even more muscle in both intact and castrate rats due to presence of androgen.
According to the research, the size of muscles, the size of rats, the metabolism and other difference in the features of intact and castrate rats were a result of a combination various factors and not one. While hormone 1 did not have any effect on metabolism, it had effect on the size of testes, on the other hand, hormone 4 had an effect on the muscle size and not the amount of muscles, and this was contrary to hormone 6 which had effect on the amount of muscles in the rats.