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Diurnal Excretion Pattern and Digestibility of Three Complete Feeds

Department of Animal Industries Southern Illinois University, Carbondale

ABSTRACT

Recent studies have indicated some advantages in mixing the roughage and concentrate into one complete feed for lactating dairy cows. Such a feed may be called a complete feed. Complete feeds containing 30% roughage and 70% concentrate have been fed ad libitum to lactating dairy cows (6, 12). Increases in FCM production without a depression of the percentage of milk fat have been observed. No data are available on the digestibility of such completely mixed rations. The effect of concentrate level in the ration has been studied by a number of researchers. Putnam and Loosli (8) studied the digestibility of rations containing 80, 60, and 40% dry matter from roughages and the remainder from concentrates. They found the apparent digestibility coefficients of the dry matter (DM), crude protein (CP), ether extract (EE), and nitrogen-free extract (NFE) increased as the proportion of concentrates in the ration increased and that the crude fiber (CF) digestibility decreased.