1883 Jan. 273/1 The milk yield given above makes an average of 9860 pounds a year for eight cows with first calf.
1945 7 3 Crossbred cows..gave an average milk yield.
1992 10 Apr. 8/4 Some British consumers have already, unwittingly, drunk milk from cows injected with a genetically engineered growth hormone to boost their milk yield by up to a third.