Influence of processed corn grain in diets of dairy cows on digestion of nutrients and milk composition

摘要

Five primiparous Holstein cows(55 d in milk)that were fitted with ruminal and duodenal cannulas were used in a 4×5 incomplete Latin square to determine the effects of blends of steam-flaked and dry-rolled corn on site and extent of nutrient digestion and milk yield and composition. Diets were fed as total mixed rations and consisted of 45/100 forage and 55/100 concen- trate; each diet contained 27/100 corn grain. Dietary treatments were composed of blends of dry-rolled and steam-flaked corn in ratios of 100:0,67:33,33:67, and 0:100.