[john2708]

hi two of my buff orpingtons the cockral and the largest hen have developed like a wheez/ gurgle when there breathing sound like chain smokers any idea what this could be

[CameronS]

Have they got anyother symptoms that may suggest cold?
How long have they had symptoms?
Have you changed anything in their life recently?
Have they been stressed out that you know of?

From what you have my first thoughts would be respiratory problems, what sort of bedding are you using for them. if it is hay, or other dusty bedding then the dust grains could be affecting their breathing.