Commentary for Shabbat 286:8

אמר ר' עקיבא קל וחומר הוא ומה חלב האשה שאינו מיוחד אלא לקטנים מטמא לרצון ושלא לרצון חלב הבהמה שמיוחד בין לקטנים בין לגדולים אינו דין שיטמא בין לרצון ובין שלא לרצון אמרו לו אם טמא חלב האשה שלא לרצון שדם מגפתה טמא יטמא חלב הבהמה

Said R. Akiba, It [the reverse] follows a minori: if woman's milk, which is set apart for infants only, defiles [whether it flows] with or without [her] desire, then cow's milk, which is set apart for both infants and adults, surely defiles [whether it flows] with or without [the owner's] desire.<span class="x" onmousemove="('comment',' For the power of rendering food susceptible to uncleanness depends upon whether the fluid is regarded as a liquid or not. Hence since cows milk is more widely used as a liquid than woman's milk, its power in this respect cannot be less than that of the latter. ');">¹⁸</span> [Said they to him]: If a woman's milk is unclean<span class="x" onmousemove="('comment',' In the same sense as in p. 727, n. 7. ');">¹⁹</span> without [her] desire, that may be because the blood of her wound is unclean;<span class="x" onmousemove="('comment',' Likewise in the same sense; Nid. 55b. ');">²⁰</span> shall cow's milk be unclean

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