Commentary for Zevachim 140:8
מתיב רב נתן אבוה דרב הונא (בר נתן) ואכל לא תאכלוהו אין לי אלא חלב שאסור באכילה ומותר בהנאה חלב של שור הנסקל ועגלה ערופה מנין
What is the reason in the case of ducks and fowls? [Is it] because they are species of birds; but a goat is not of the same species as a heifer.<span class="x" onmousemove="('comment',' Hence it will defile. - A heifer is counted amongst the large cattle, while a goat belongs to the small; therefore they are regarded as different species.');"><sup>8</sup></span>
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