Our experinces, leads us to the simple recessive conclusion as well. I also believe that there is an addtional severity component that we don't undestand as of yet. The handfulll of the meg's we have produced have all survived to long and fairly normal lives to ripe old ages thus far, and I would consider them mild cases based on what I've heard from our vet and other breeders. Essentially the puppys enlarged esoph. is grown into over time. Now, the Ariartic Arch? version is deadly from my understanding as that is linked to a heart ailment which requires surgery to survive, this is what you are really trying to diagnos with the barium, is it not? M -------------- Original message ---------------------- From: Windwalkergsds@xxxxxx > In a message dated 11/5/2006 7:31:58 AM Mountain Standard Time, > PAGAIRS@xxxxxxx writes: > > Its my understanding that both the sire and dam have to be carriers. > That has been my experience also, Patty. I wish someone could figure out how > it is inherited, also define the degrees of mega....some need to be put down > and others are totally asymtomatic. XL sired litters that had NO mega and > some that had one or two. I assumed from those experiences that he carried > the > gene but had to have a bitch who also carried it in order for it to express > itself. > Jamie > > > ============================================================================ > POST is Copyrighted 2006. All material remains the property of the original > author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any > kind > are permitted without prior permission of the original author AND of the > Showgsd-l Management. ALL RIGHTS RESERVED. > > ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY > MANNER > OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF > ALL > PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A > VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. > > For assistance, please contact the List Management at admin@xxxxxxxxxxxx > > VISIT OUR WEBSITE - URL temporarily deleted due to AOL issues > ============================================================================ ============================================================================ POST is Copyrighted 2006. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - URL temporarily deleted due to AOL issues ============================================================================