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Effects of Concentrates with Beef Tallow on Food Intake and Milk Production of Cows Fed Grass Silage

The Hannah Research Institute, Ayr, Scotland KA6 5HL

ABSTRACT

In two experiments, dairy cows were given either high-quality grass silage alone or with barley-based concentrates added. Up to 946 g/day of beef tallow was added to the concentrates. Addition of tallow did not have large effects on replacement rate of concentrates until the largest amount was reached. In each experiment, addition of the least amount of tallow, 364 or 412 g/day, increased milk yield and milk fat yield, but there was no further increase as amount of tallow increased. Addition of tallow increased the proportion of metabolizable energy surplus to maintenance that was transferred into the milk. The proportion of shortchain and of 16-carbon fatty acids in milk fat was reduced and that of 18-carbon fatty acids was increased.