Assertion: yak's milk yield | /r/HasProperty | increased by 15.5 percent
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Source sentences:
text: The results of such addition during lactation indicate that milk yield of full-lactating yak cows (milking in the year of calving) was increased by 15.5 percent and that of half-lactating cows (those milking into a second season without calving again) by 14.8 percent.