The Myotonic goat is a very feed efficient browser. This means they are able to sustain and grow on less feed intake than breeds of similar size. This seems to go hand in hand with their slow growth rates. One should not consider a Fainter mature until at least the age of three though some don't fully mature till the age of four. This is why care needs to be taken when breeding these animals.
Most breeds are able to kid at one year without detrimental consequences.
If bred sooner they may not obtain their full adult potential and thus not become as heavily boned as they should. This decrease in bone may not become a problem till the animal is well into their adult life. If they obtain a large muscle mass on a small frame they may have difficulty caring their weight as they age. In their older years this could lead to joint problems which can decrease the quality of their life. Now for some general information about Myotonic Goats.