Add/remove testosterone in animals

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In summary, when a rooster is castrated, it cannot exhibit certain male traits and this is known as being a 'capon'. On the other hand, when a lioness is injected with testosterone, it can exhibit male traits. Other examples of similar results are seen in cattle, horses, and humans with conditions such as PCOS. These traits, known as secondary sex characteristics, are under hormonal control and can affect the physical expression of the opposite sex.
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It is well known that, when castrating a rooster it, it won’t be able to exhibit certain male traits (called a ‘capon’). The opposite is also true, when for instance a lioness is injected with testosterone, it will exhibit male traits.

Are there more examples known of comparable results, but with different animals?
 
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Yes. A steer or bullock, castrated male cattle, are the primary source of agricultural beef production. So yes, hormones work as expected in mammals.
So this gives you millions of examples. They are castrated to reduce dangerous-to-humans male behaviors. Horses ditto, the horse is referred to as a gelding.

Higher than normal levels of testosterone in female humans is associated with PCOS. Another 200,000 new cases diagnosed every year. So, lots more examples. https://www.womenshealth.gov/a-z-topics/polycystic-ovary-syndrome

But I fail to see why this might be all that instructive. What are you actually trying to find out?
 
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Thanks for you answer @jim mcnamara, but I was actually interested in examples of other animals who physically expressed the traits of the other sex when testosterone was removed (in the case of males) or added (in the case of females). Do you know any?
 
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You might want to look into secondary sex characteristics generally. These are things that differ between the sexes, but are not the sex organisms themselves (the primary sex differences).
Many are under hormonal control.
Some of these hormones act on certain features at specific developmental stages, when certain features are developing, but can have little or no effect later (in adult life) after they have already developed.
 
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@BillTre Thanks, that really helped! I didn't know these traits were called 'secondary sex characteristics'.
 

1. What is the purpose of adding or removing testosterone in animals?

The purpose of adding or removing testosterone in animals is to manipulate their hormone levels in order to study the effects of testosterone on their behavior, physiology, or development. It can also be used to treat certain medical conditions in animals.

2. How is testosterone administered to animals?

Testosterone can be administered to animals through various methods such as injections, implants, or topical applications. The method chosen will depend on the specific animal species and the desired duration of testosterone exposure.

3. Can adding or removing testosterone in animals have negative side effects?

Yes, adding or removing testosterone in animals can have negative side effects. For example, excessive levels of testosterone can lead to aggressive behavior, while removing testosterone can result in decreased muscle mass and fertility. It is important to carefully monitor hormone levels and adjust dosage accordingly.

4. Are there any ethical concerns surrounding the use of testosterone in animals?

Yes, there are ethical concerns surrounding the use of testosterone in animals. Some people may argue that manipulating hormone levels in animals is unnatural and can cause harm to the animals. It is important for scientists to carefully consider the potential impacts and benefits before conducting any experiments involving testosterone in animals.

5. Can adding or removing testosterone in animals affect their reproductive abilities?

Yes, adding or removing testosterone in animals can affect their reproductive abilities. Testosterone plays a crucial role in the development and function of reproductive organs in both male and female animals. Manipulating hormone levels can disrupt this process and potentially impact fertility.

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