Commentary for Chullin 115:12
זה וזה גורם מותר
It must be, surely, that the animal was first rendered trefah and then impregnated,<span class="x" onmousemove="('comment',' For in this case only is the calf regarded as the product of two combined causes, i.e., of the cow which is trefah and of the bull which is permitted. Where the cow was already with young when it became trefah the calf, according to all views, would be forbidden, since it was rendered trefah together with its dam.');"><sup>7</sup></span>
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