> Sperm is sperm wat difference does age make!! Only answer i could give was about health testing etc etc.
> Why should you wait for them to mature?
>
Apart from the health testing aspects, using a dog too young is a bad idea. I have a breed that is sexually mature at 6 months, but wouldn't dream of using them at stud that early. An older, more experienced stud dog will check a bitch out, and not pester her if she's not ready.
A youngster, with his hormones raging, will want to hump her every which way! Even if she's not ready. A bitch can go for a dog and tell him in no uncertain terms that she's not happy. A really nasty bitch could frighten your young dog for life, even so far as making him too frightened to "try it on" ever again.
It is usually recommended that you use an experienced stud dog for a maiden bitch. He'll treat her courteously, and not pester until she's ready.
Likewise, it is always sensible to have an inexperienced dog mate a wiser bitch that has whelped previously. She'll know what she's doing, and make it an easier first time experience.
Your friends probably think the same as a lot of non doggy people. You just put them together, and let them get on with it. Owning a stud boy is a responsibility that should be taken seriously. You owe a duty of care to the bitch using your boy, and need to ensure she is calm - not everyone has the experience to deal with a maiden. I've seen them turn somersaults once a tie is achieved, not a happy experience for the male! Some bitches go into complete panic, and try to run off. Others scream during the tie, and it sounds as if someone is being murdered.
Of course, your friends won't have experienced any of this, or seen the damage that a bad mating can produce.