Effects of Forage Source and Amount of Concentrate on Rumen and Intestinal Digestion of Nutrients in Late-Lactation Cows

摘要

The objectives of this study were to determine the effects of dietary forage source with two concentrate concentrations on dry matter (DM) intake, rumen fill, ruminal and intestinal digestibility of nutrients, and duodenal N fractions in lactating cows. Four rumen and duodenal cannulated Holstein cows in late lactation were used in 4 x 4 Latin square design experiment with 21-d periods. Diets were 1) 65/100 first-cut alfalfa silage and 35/100 concentrate, 2) 50/100 alfalfa and 50/100 concen- trate, 3) 65/100 bromegrass silage and 35/100 concentrate, and 4) 50/100 bromegrass and 50/100 concentrate. Dry mat- ter intake was not affected by forage source but tended to be (P = 0.08) higher for cows fed diets with 50/100 concentrate. Rumen fill was greater (P < 0.01) for cows fed bromegrass compared with those fed alfalfa silage. Ruminal and intestinal digestion of DM was not af fected by dietary forage source or concentrate level. Total N intake was greater for cows fed alfalfa-based diets, reflecting the higher crude protein content of al- falfa. However, total N flow at the duodenum was not affected by either forage source or concentrate in the diet. Although forage source influenced the site ofdiges- tion of some nutrients no significant effects on total tract digestibilities were observed.