Reference for Chullin 40:13

והא"ר ירמיה אמר שמואל

Ze'iri said: If the neckbone of an animal was broken together with the major portion of the surrounding flesh, the animal is nebelah forthwith.<span class="x" onmousemove="('comment',' And conveys uncleanness from this moment, as it is regarded already as dead; although the animal still shows sign of life by movements and jerks.');">⁷</span>

Jastrow

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