Halakhah for Chullin 166:20

שחט חיה ואח"כ שחט בהמה פטור מלכסות בהמה ואח"כ חיה חייב לכסות

For R'Zera stated: Wherever proper mingling is possible the mingling is not indispensable, but wherever proper mingling is not possible the mingling is indispensable.<span class="x" onmousemove="('comment',' V. Men. 103b. It has been taught that one may not bring a meal offering consisting of sixty-one 'esronim (plural of 'issaron, the tenth part of an ephah) in one vessel for it cannot be mingled thoroughly with the prescribed log of oil. Now although it is established that the meal-offering is valid even though the flour and oil had not been mixed, it must, declared R. Zera, be in the condition in which it could be mixed if so desired, but if it cannot be mixed the meal-offering, is invalid. This principle of R. Zera is applied here: the requirement of placing dust underneath the blood can be dispensed with so long as it is possible to do so if desired, but in the case of a consecrated bird, where it is not permissible to place dust upon the altar underneath the blood, this requirement becomes indispensable.');">¹¹</span>

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