Howdy Mr. Akila,
Yes, it's all about the colagen.
In the book 'The Traditional Bowyer's Bible - Vol. 1,' there is a chapter titled, GLUE. (by Tim baker).
In that chapter, Mr Baker lists results from straight tests of a wide range of "glues." From that list, on page 208;
Sinew Glue...36 lb.s
Bone Glue, sold as Hide Glue...36 lb.s
Hide Glue.....38 lb.s
Fish Bladder Glue...40 lb.s
Knox Gelatin (Jello)...42 lb.s
Mr. Baker goes on to explain that, "Above about 35 lb.s the (hard wood) samples themselves begin to fail." I interpreted this statement as him suggesting that at about 35 lb.s the glue becomes as strong as or stronger than the wood that it is glued to.
I hope this was helpful informantion, and I look forward to seeing your glued-up composit bow.
best of Luck,