Reference for Chullin 158:15

לעולם בתייש הבא על הצבייה וילדה בת ובת ילדה בן וקא שחיט לה ולברה

R'Eliezer, on the other hand, holds that we do not take into consideration the seed of the male parent, nor do we say that the term 'sheep' includes that which is a sheep in part only.<span class="x" onmousemove="('comment',' The female young is a hind, taking exclusively after its dam and so the law of 'It and its young' does not apply to it.');">⁷</span>

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