it is good to only breed them once a year saves the animal all the work of egg laying and producing. but they can lay retaining clutches with only beening mated once so oneinteraction could end up with at least 2 fertile clutchs.
The health of the animal should be assessed prior to each mating
Laying eggs is generally considered a strain on the females (fertile or not) and it is often stated that maintaining a female in such a way as to not encourage egg production will extend her life. Thus the conclusion could perhaps be drawn that frequent breeding might reduce lifespan.
I don't know if I'm correct, but didn't brad breed his female like 6-7 months ago? For sure, if you do, you need to give time after she lays her last clutch to rest rest rest rest!
I assume you are talking about veileds?
I don't like to breed mine until they are at least one year old and full grown.
If you breed a veiled once one of the following will be likely depending on how far along she is in her cycle...
If she is bred at the right time in her cycle she will lay a completely fertile clutch followed a few weeks later by another clutch that will have at least some fertile eggs in it.
If bred "too late" in her cycle she will quite likely dump the clutch that she is working on and the next clutch will be fertile followed by another clutch (as above).
If she is bred not quite so far along in her cycle she will likely produce a clutch that contains some fertile eggs and some infertile followed by either a completely fertile clutch or a partly fertile clutch.
After that she can continue to produce clutches of infertile eggs unless you control her diet and to some degree her temperature...at the right time in the cycle...from what I have experienced.