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The Nutritive Value of Alfalfa Hay. I. Cystine as a supplement to an all Alfalfa Hay Ration for Milk Production^*

Dairy Husbandry Section and the Chemical Section of the Michigan Agricultural Experiment Station, East Lansing

ABSTRACT

The experimental work reported in this paper is one phase of an extensive project initiated for the purpose of investigating the nutritive value and methods of feeding alfalfa hay to dairy cattle for efficient milk production. Since the trend in the feeding of dairy cattle is toward the greater use of home-grown rations it becomes imperative to have additional knowledge concerning various nutritional factors affecting milk production. The results reported in this paper are of further interest because of the absence in the literature of data on the effect of feeding cystine to lactating dairy cows.

In a previous report (11) it was indicated that alfalfa hay grown in the vicinity of East Lansing, Michigan, and fed as a sole ration to milking cows was deficient in a factor or factors essential for efficient milk production. The addition of isocaloric amounts of either corn or beet pulp in place of some of the alfalfa resulted in a marked increase in milk production.

^* Published with the approval of the Director of the Agricultural Experiment Station as Journal Article no. 576 (n. s.).