Reference for Bekhorot 81:50

ואי כתב רחמנא תרי למעוטי הני דכחישי אבל מזוהם דלא כחיש אימא לא

to exclude the case of a sick animal, I might have thought that the reason was because it is not usual for an animal to be ill, but in regard to an old animal, since it is a usual thing,<span class="x" onmousemove="('comment',' A normal thing for an animal which grows old not to retain its former vigour and therefore this should not be regarded as a disability.');">³¹</span>

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