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Lactational Response to Dried Whey in Concentrate Mixture Fed to Dairy Cows¹

Dairy Science Department, South Dakota State University, Brookings 57007

ABSTRACT

Previous short (6 to 13 wk) experiments indicated that including small amounts (5% or less)of dried whey in the concentrate mixture fed to lactating cows increased milk fat percentage but decreased milk production slightly. Five percent dried whey product was included in the concentrate mixture fed to 10 Holstein cows from 3 wk postpartum to the end of lactation to determine if previous responses were positive increases in milk fat percentages caused by feeding dried whey or a normal response to drying cows off prematurely. The dried whey product replaced a portion of the corn, soybean meal, and dicalcium phosphate in the 10 controls' concentrate mixture. Cows were fed concentrate at 1 kg/3 kg milk produced, 7 kg alfalfa hay daily, and corn silage ad libitum. Actual milk production was similar from cows fed the control and dried whey product diets (22.4 and 22.3 kg/day), while fat percent was higher from cows fed dried whey product (3.49 and 3.62%). Persists ency with which production was maintained throughout lactation was similar with both diets, but persistency of 4% fat-corrected milk was greater for cows fed dried whey product. Percentages of protein and solids-not-fat in milk were not affected by treatment. Feeding small amounts of dried whey to lactating cows will not affect milk production adversely.

¹ Published with approval of the Director of the South Dakota Agricultural Experiment Station as Publication No. 1687 of the Journal Series.