Regarding the beginning of the 3rd perek in Bechoros, where else in Shas do we have an example of Rov ha'tully bi-maase except the tosfos' example?
See Teshuvos Rav Akiva Eiger 1:162 who brings from the Rashba on Chulin 9a. See also Ritva Kidushin 50b and the Sefer ha'Makneh ibid. See also Ramban Chullin 11b, Rashba 12a and Teshuvas ha'Bach #1.
Dov Zupnik