Assertion: lactating yak | /r/HasProperty | 170 - 200 kg
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text: A further study with lactating yak (170 - 200 kg) conducted by the same authors indicated, however, that yak cows had a lower efficiency of metabolizable-energy utilization for milk production (averaging 0.46) than dairy cattle and this in turn suggests that it may be one of the features of energy metabolism developed by the yak under long-term natural selection to concentrate the available energy to withstand the harsh environment and thus ensure survival.