Some abstracts do not have video files because ASAS was denied recording rights.

456
Ensiling barley varieties selected for varied levels of in vitro NDF degradability

Wednesday, July 20, 2016: 9:30 AM
251 B (Salt Palace Convention Center)
Natalie G Preston , Lethbridge Research and Development Centre, Agriculture and Agri-food Canada, Lethbridge, AB, Canada
Jayakrishnan Nair , University of Saskatchewan, Saskatoon, SK, Canada
Peiqiang Yu , University of Saskatchewan, Saskatoon, SK, Canada
David A. Christensen , University of Saskatchewan, Saskatoon, SK, Canada
John J. McKinnon , Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, SK, Canada
Tim A. McAllister , Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada
Audio File Recorded Presentation (mp4)
Abstract Text:

This study characterized the ensiling traits and digestibility of three barley varieties ranked for in vitro NDF degradability (NDFD). CDC Cowboy (H-NDF), CDC Copeland (I-NDF), and Xena (L-NDF) were ranked as high, intermediate, and low NDFD based on commercial silage samples (n=80) collected over two years. Barley varieties were planted the same day in one location and ensiled at the mid-dough stage in replicated mini or bunker silos.  Silos were opened after 60 d of ensiling for chemical and microbial analysis. Silage from mini silos was exposed to air with temperature continuously measured and samples collected at 3, 7, 14, and 21 d. Silage was collected periodically from bunker silos during feed out. In vitro NDFD after 30 h of incubation in rumen fluid was estimated for silage collected after 60 d.  Data were analyzed using the Proc Mixed procedure of SAS as a complete randomized design with fixed effect of variety and ensiling method, and random effect of silo within variety, and day as a repeated measure for aerobic stability. In vitro NDFD did not differ among varieties. Terminal pH was lowest (P < 0.01) for H-NDF in mini silos. The pH of H-NDF was higher (P < 0.01), and I- and L-NDF lower (P < 0.01) in bunker than mini silos. Lactate and acetate levels were higher (P < 0.05) in H-NDF mini silos, with acetate levels of all varieties being lower (P < 0.01) after ensiling in mini silos as compared to bunker silos. Day 60 I-NDF in mini silos had higher (P < 0.01) ADF and NDF levels, with method of ensiling affecting fiber levels (P < 0.01) with increased ADF and NDF in H-NDF and L-NDF in bunker as compared to the mini silos. The H-NDF silage was less aerobically stable than other silages as reflected by increasing (P < 0.01) temperature and pH (P < 0.05)  and decreased levels of lactic acid (P < 0.05) and water-soluble carbohydrates (P < 0.01) over the exposure period. Using in vitro NDFD of field silage to select barley silage varieties for improved fiber digestibility proved difficult due to the effects of time of harvest and the fermentation process on this trait.

Keywords: barley silage, NDF degradability, aerobic stability

See more of: CSAS graduate student oral competition I
See more of: CSAS Graduate Student Oral Competition
Previous Abstract | Next Abstract >>

American Society of Animal Science, PO Box 7410, Champaign, IL 61826-7410 E-mail: asas@asas.org, Ph. 217.356.9050, Fax 217.689.2436 All pages Copyright © 2012 ASAS. All Rights Reserved.