i have a 6 month old Maine coon who is not fixed yet as breeder said to wait until a year. He said his mane won't come in as full if you neuter too early. Plus said they are not sexually mature until a year old I have a domestic female who I just inherited from my mom. She is not fixed yet and in heat. I don't want kittens . What is your opinion on Maine coon males age and being able to reproduce? They are both indoor cats .