Partial replacement of concentrate by high quality hay for cows in early lactation.

摘要: Abstract The objective was to evaluate the effect of partial replacement concentrate with high quality hay in diet lactating cows. Basal forage components were long alfalfa and corn silage. In Trial 1, 30 Holsteins early lactation fed concentrates containing a ground legume-grass at 0, 20, 33%. There no differences intake dry matter, yields milk or components, changes body weight. Glucose, urea nitrogen, free fatty acids blood volatile rumen contents differed. trial 2, six Holstein three Brown Swiss cows blocked into groups 19-day measurement digestibility rate passage feeds. Alfalfa-grass either chopped form replaced 0 20% concentrate. marker meal, portion stained basic fuchsin crystal violet. apparent digestion coefficients from forage. marked retention time for component. Concentrate substitution passed through digestive tract more rapidly than 0% that