Responsa for Yevamot 132:2

רב יהודה אמר הדין עמה משום שבח בית אביה דידה הוי ר' אמי אמר הדין עמו כיון דאמר מר אם מתו מתו לו ואם הותירו הותירו לו הואיל וחייב באחריותן יאכלו אמר רב ספרא מי קתני והן שלו הואיל וחייב באחריותן קתני ולעולם לאו דידיה נינהו

is responsible invariably eat <i>terumah</i>? Surely we learned: An Israelite who hired a cow from a priest may feed her on vetches of <i>terumah</i>. A priest, however, who hired a cow from an Israelite, though it is his duty to supply her with food,<span class="x" onmousemove="('comment',' And though he is also responsible for the loss, or theft of the animal. ');">⁴</span> must not feed her on vetches of <i>terumah</i>!<span class="x" onmousemove="('comment',' 'A.Z. 15a; which shews that even an animal for which a priest is responsible (v. supra n. 2) is not permitted to eat terumah. How, then, could it be said, SINCE HE IS RESPONSIBLE FOR THEM THEY ARE PERMITTED TO EAT? ');">⁵</span> — How could you understand it thus! Granted that he is liable for theft or loss, is he also liable for accidents, emaciation or reduction In value!<span class="x" onmousemove="('comment',' Certainly not. Such a restricted responsibility, therefore, is incomplete and does not confer the right to terumah. ');">⁶</span>

Teshuvot Maharam