Use UDP for (small) incremental zone transfers?

[Jesus Cea]

I have a dns zone with many dns updates per minute. The updates are 
tiny, like 2-3 records, <500 bytes in total.

Currently my secondaries receive a NOTIFY and they do a TCP connection 
to request a incremental zone transfer. We know that TCP is "heavy" and 
the data I need to transfer is tiny before shutting down the TCP connection.

Is there any way to do incremental zone transfer via UDP and, if the 
size is too big (>1232 bytes), fall back to TCP?

Thanks!

PS: I protect everything using TSIG.

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