| Good idea but one may have wait a long time to gather information on the progeny's reproductive success.
It also applies to juveniles that were probed (sexed) in the early days of their lives. Some people claim that they can probe neonates and that the probed animals don't suffer kinked tails. That may be so, but how do you know that their reproductive organs weren't damaged and their breeding potential compromised? You won't find out till 3- 4 years later. | 
