Reference for Keritot 49:7

השוחט פרת חטאת ושור הנסקל ועגלה ערופה ר"ש פוטר וחכמים מחייבין

From that which we have learnt:<span class="x" onmousemove="('comment',' Hul. 81b. This Mishnah deals with the prohibition of slaughtering the young with its mother on the same day (Lev. XXII, 28) . The three types of animals enumerated in this Mishnah are such as are forbidden for use. Their ritual slaughtering, therefore, does not produce its normal effect, viz., of rendering the flesh permitted to be eaten. It is therefore questionable whether the slaughtering of such animals is subject to the uyja, prohibition of, 'It and its young', since the text there speaks of , which denotes slaughtering for the purpose of rendering the flesh fit for food.');">³</span>

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