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Evaluation of Whey-treated Alfalfa Haylage¹

Dairy Science Department, South Dakota State University, Brookings 57006

ABSTRACT

Untreated alfalfa haylage (60% dry matter) or alfalfa haylage treated with 2% dried whole whey (dry matter basis) was fed to four Holstein steers in a digestion trial with 5-day collection. Dried whey improved digestibilities of all chemical constituents except ether extract. Fermentation characteristics of whey-treated alfalfa haylage were generally superior to those of untreated alfalfa haylage. A lactation trial concurrent with the digestion trial used the same haylages as the forage. Experimental haylages were fed ad libitum to 10 Holstein cows each in a 12-wk continuous trial. All cows received concentrates at 1 kg/2.55 kg milk yield. Milk production and composition were similar for treatment groups. Cows fed whey-treated haylage had more body weight gain than cows fed untreated haylage. Rumen pH and volatile fatty acid values were not different.

¹ Approved for publication by the Director, Agricultural Experiment Station, South Dakota State University, Brookings, as journal series no. 1237.

² Present address: State Department of Agriculture, Pierre, South Dakota 57501.