We don't know of any commercial Abs vs. chicken Thy-1, but you might find this study of interest if you haven't already seen it: http://www.ncbi.nlm.nih.gov/pubmed/2877095

We do list Abs vs. Brn3a and Brn3b that are supposedly cross-reactive with chicken. Just search here: http://www.linscottsdirectory.com/search/antibodies for Brn3 and select "chicken" from species reactivity filter. Follow "more info" to suppliers' pages.

Hope this helps.