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Journal of Dairy Science Vol. 72 No. 2 501-504
© 1989 by American Dairy Science Association ®
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Effect of Chemical Drying Agents on Alfalfa Hay and Milk Production Response When Fed to Dairy Cows in Early Lactation1

S. O. Oellermann, M. J. Arambel2 and J. L. Walters

Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan 84322-4815

ABSTRACT

Third-cutting alfalfa hay cut at bud stage was treated with a drying agent consisting of potassium carbonate, sodium carbonate, and citric acid at the rate of 280.6 L/ha (1 kg/37.47 L water) to alternate swaths 4.27-m wide. Hay samples were taken at cutting and at 4-h intervals during daylight until baling was initiated. Twenty lactating Hoistein cows were randomly assigned to untreated and treated alfalfa hay treatments in a switchback design. Individual feed intakes and milk yields were recorded daily. Milk composition was analyzed once weekly. Drying rates were: .40 and .48% moisture/h for control and Na2-K2CO3-citrate treatments, respectively. There was no significant difference between treatments in feed composition parameters nor in vitro DM digestibility parameters. Cows fed the hay treated with Na2-K2CO3-citrate had a higher mean daily milk yield, adjusted for feed intake, compared with cows fed untreated hay (33.0 versus 32.5 kg/d). There were no significant differences in milk composition between treatments.

FOOTNOTES

1 Supported in part from a grant from Church and Dwight Co, Inc., Princeton, NJ.

2 Reprint requests should be sent to this author. This paper is approved by the Director of the Agricultural Experiment Station, Utah State University, Logan. Journal Paper Number 3566.






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Copyright © 1989 by the American Dairy Science Association ®.