Skip to main content
ARS Home » Midwest Area » St. Paul, Minnesota » Plant Science Research » Research » Publications at this Location » Publication #186924
Title: EVALUATING IN VITRO NEUTRAL DETERGENT FIBER DIGESTIBILITY OF HIGH-FIBER BYPRODUCT FEEDS AND FORAGES

Author
item WAKKER, J - UNIVERSITY OF MINNESOTA
item Jung, Hans Joachim
item LINN, J - UNIVERSITY OF MINNESOTA

Submitted to: Midwestern Section of the American Society of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 2/1/2006
Publication Date: 3/20/2006
Citation: Wakker, J., Jung, H.G., Linn, J.G. 2006. Evaluating in vitro neutral detergent fiber digestibility of high-fiber byproduct feeds and forages [abstract]. Midwestern Section ASAS and Midwest Branch ADSA Annual Meeting, March 20-22, 2006, Des Moines, Iowa. Abstract No. 16.

Interpretive Summary:

Technical Abstract: In vitro neutral detergent fiber digestibility (IVNDFD) is being used to evaluate feeds for quality and purchase. The objective of this study was to evaluate the repeatability of IVNDFD analysis over time using 12 forages and 10 high-fiber byproduct feeds. During a 6-wk experimental period, ruminal contents were collected once a week on a bi-weekly basis from a single lactating Holstein cow. Ankom filter bags containing 0.5 g of each feedstuff were incubated, in duplicate, for 48 h at 39°C using the Daisy Oven system. Data were analyzed using PROC GLM of SAS. Week of rumen fluid collection significantly (P < 0.05) affected IVNDFD across feeds with collection 2 having lower IVNDFD values than collections 1 and 3. Ranking by IVNDFD of forages, but not byproduct feeds, was affected (P < 0.05) by collection. Average IVNDFD for whole cottonseed and wheat middlings were 32 and 54%, respectively, while the other 8 byproduct feeds ranged from 84 to 91% IVNDFD. For a conventional corn silage sample, collections 1 and 3 were higher (P < 0.05) in IVNDFD than collection 2 (67 and 66 vs. 45%). A brown midrib (BMR) corn silage’s IVNDFD was higher (P < 0.05) for collection 3 compared to collections 1 and 2 (73 vs. 60 and 59%). Comparing the conventional and BMR corn silages, IVNDFD was different for collection 2 (45 vs. 59%) but not different for collections 1 (67 and 60%) and 3 (66 and 73%). Three alfalfa samples (1 haylage and 2 hays) did not differ for their IVNDFD values across collections but ranking by IVNDFD within rumen collections revealed differences. Haylage was higher (P < 0.05) in IVNDFD than hays 1 and 2 for collection 1 (62 vs. 53 and 52%), similar to hays 1 and 2 for collection 2 (54 vs. 51 and 50%) and higher (P < 0.05) than hay 2 for collection 3 (58 vs. 50 vs. 47%). Repetitive rumen fluid collections under standardized conditions resulted in different IVNDFD values for individual feeds. Ranking of forages, but not byproduct feeds, varied among rumen fluid collections.