EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of fiber source and ruminal starch degradability on site and extent of digestion in dairy cows


Journal of dairy science 76(8): 2244-2253
Effect of fiber source and ruminal starch degradability on site and extent of digestion in dairy cows
Four duodenally cannulated Holstein cows (166 DIM) were used in a 4 times 4 Latin square with a 2 times 2 factorial arrangement of treatments to study effects of forage fiber source and ruminal starch degradability on digestion events. Forage NDF (21% of dietary DM) was from either alfalfa hay or a 1:2 (substituted on an NDF basis) ratio of alfalfa hay to wheat straw. Low and high ruminal starch degradabilities were achieved by use of either dry-rolled or steam-flaked sorghum grain, respectively. Dry matter intake did not differ among treatments (21 kg/d). Ruminal and total tract digestibilities of dietary OM, N, NDF, and ADF and flow of N fractions to the duodenum were not affected by fiber source. Diets with steam-flaked grain had higher ruminal (74 vs. 48%) and total tract (98 vs. 83%) starch digestibilities than did those diets with dry-rolled grain. Digestibilities of feed OM (63 vs. 51%) and CP (61 vs. 53%) and duodenal flows of nonammonia N (120 vs. 110% of intake) and bacterial N (.45 vs. .35 kg/ d) also were higher, but microbial yield efficiency was not influenced by degradability of starch. Steam-flaked sorghum grain improved ruminal and total tract digestion of starch by lactating dairy cows and enhanced bacterial protein synthesis. Wheat straw NDF was substituted for two-thirds of the alfalfa hay NDF in diets for midlactation cows without adversely affecting digestion events or nutrient flow to the duodenum.

Accession: 002355826

DOI: 10.3168/jds.S0022-0302(93)77561-X

Download PDF Full Text: Effect of fiber source and ruminal starch degradability on site and extent of digestion in dairy cows



Related references

Effects of fiber source and ruminal starch degradability on site and extent of digestion in dairy cows. Journal of Dairy Science 76(8): 2244-2253, 1993

Starch digestion site: influence of ruminal and abomasal starch infusion on starch digestion and utilization in dairy cows. Animal Science 80(2): 201-207, 2005

Effect of maize grain treatment on ruminal fermentation and the site and extent of starch digestion in cows. Journal of Animal and Feed Sciences 14(1): 79-91, 2005

Response of lactating Holstein cows to diets varying in fiber source and ruminal starch degradability. Journal of dairy science 76(8): 2235-2243, 1993

Endosperm type and kernel processing of corn silage Effect on starch and fiber digestion and ruminal turnover in lactating dairy cows. Journal of Dairy Science 85(Supplement 1): 204, 2002

Effect of corn particle size on site and extent of starch digestion in lactating dairy cows. Journal of Dairy Science 87(5): 1389-1399, 2004

Effect of sorghum grain processing on site and extent of starch digestion in lactating dairy cows. Journal of Dairy Science 75(SUPPL 1): 296, 1992

Effect of sorghum grain processing on site and extent of digestion of starch in lactating dairy cows. Journal of Dairy Science 78(6): 1318-1327, 1995

Site and extent of raw potato starch digestion in dairy cows. Wirtschaftseigene Futter 36(3): 246-257, 1990

Effects of ruminal protein degradability and frequency of supplementation on site and extent of digestion and ruminal fermentation characteristics in lambs fed low-quality forage. Journal of Animal Science 88(2): 718-726, 2010