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Sources and Percentages of Net Energy of Dairy Rations as Related to Milk Production¹

Dairy Department, University of Georgia, Athens

ABSTRACT

Most evaluations of total rations fed to dairy cows have been concerned with estimations of energy intake expressed as digestible-dry-matter (DDM) or total-digestible-nutrients (TDN). These are measures of the chemical composition of forages and concentrates rather than measures of the physiological response of the animals. Eventually, the entire feeding program must be re-evaluated based upon the response of lactating animals. Dairy Herd Improvement Association (DHIA) records processed by Electronic Data Processing Machines (EDPM) now express the intake of concentrates, succulents (silage and green chopped forages), dry roughages, and pasture in terms of percentages of net energy (NE) of the total ration.

Putnam and Loosli (4) fed rations in which either 80, 60, or 40% of the dry matter content came from forages and the balance from concentrates. They found a slight difference in the amount of milk produced per pound TDN fed. The range was from 2.10 lb fat-corrected milk (FCM) to 1.93 lb FCM for the 80 and 40% roughage rations, respectively.

¹ Journal Paper No. 337 of the College Experiment Station of the University of Georgia, College of Agriculture Experiment Stations.