Boehringer Mannheim (BM) markets an anti-rabbit IgG-AP. This is a sheep IgG
raised to rabbit IgG, and then conjugated to alkaline phosphatase. I'm
not sure how specific you're need is for a goat-derived antibody. I
hope this info. could also be useful. Perhaps, others may come up with
the right specification. Anyway, good luck!
Division of Plant Pathology
International Rice Research Institute
e-mail: rscott at irri.cgnet.com
Note: I'm not endorsing BM as a source nor am I connected in any special
way with this company.