Effect of Concentrate Level on Milk Production of Cattle Grazing High-Quality Pasture

Over a six-year period milking cows grazed on pasture as a source of forage were given various levels of concentrates to determine effect on milk production. Several experimental designs were used. A 3 3 Latin-square design replicated three times was used in the first two years (modified between first and second years), after which continuous comparisons were made. In most instances the cows were past the peak of milk flow when coulparisons started. In a limited way cows in full milk flow were tested for effects of variation in concentrate intake.