Assertion: yak's milk | /r/HasProperty | around 80 percent
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Source sentences:
text: These authors also indicated that the amount of milk in the udder cistern of the yak accounted for only about 6.5 percent of the milk produced at a milking and that the milk produced as a reflex to milking accounted for around 80 percent - of which four fifths was let down as a result of the first stimulation of the udder and the remaining fifth after the second stimulation.