The Torah prohibition of Dosh traces back to the times of the Mishkan when wheat kernels were separated from their external shells by threshing. The most common toldah (derivative) of Dosh is Sechita or Mefarek – extracting a liquid from a solid.
Can you milk a cow on Shabbat? This appears to be a classic case of sechita, squeezing the cow’s udder, a solid, so that milk can flow out. The Gemara limits sechita to gedulei karka (vegetation, which grew from the ground). However, the accepted view is that milking is prohibited on Shabbat, since a cow is sustained by vegetation. The son of the Rambam adds that the condition of gedulei karka only applies to the av melacha as it was done in the Mishkan, and not to the toldah of sechita.
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