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Effect of Diet Upon Activities of Several Enzymes in Abdominal Adipose and Mammary Tissues in The Lactating Dairy Cow

Department of Animal Husbandry, University of California, Davis

ABSTRACT

A number of investigations have suggested that the milk fat depression observed when cows are fed high concentrate:low roughage diets might be due, in part, to alterations in the metabolism of either adipose tissue, mammary tissue or both (1, 6–8). Since metabolic changes are often due to or reflected in changes in enzyme activities, a study was undertaken on the effects of feeding all-hay and all-concentrate diets upon the activities of several enzymes of carbohydrate and fat metabolism in adipose and mammary tissue.

Experimental Procedure

This preliminary study was made with samples obtained from eight lactating Holsteins and one lactating Jersey. One of the Holsteins and one Jersey were fed all-hay or all-concentrate rations in isocaloric amounts in an incomplete double-reversal trial. The all-hay ration was offered ad lib. and the concentrate in amounts to provide 68% of the dry matter intake on hay (7). This experiment had to be limited, because the Jersey stopped lactating in the last period.

¹ Norwegian College of Agriculture, Vollebekk, Norway.

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