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- Title
Intake and Digestibility of Big Bluestem Hay and Baleage.
- Authors
Burns, J. C.; Fisher, D. S.
- Abstract
Big bluestem (Andropogon gerardi Vitman) has potential to be a source of preserved forage for the mid-Atlantic Region. This 3-yr study compares its preservation as hay, direct-cut (DC) baleage, and wilted (WT) baleage when harvested in the late-boot to heading stage. The DC baleage averaged 373 g kg -1 dry matter (DM) and WT averaged 536 g kg-1 DM. The DC baleage had a pH of 5.2 vs. 5.6 (P = 0.06) for the WT. Steer {Bos taurus) intakes of the DC and WT baleage were similar (1.72 kg per 100 kg body weight) and greater (P = 0.07) than intake of hay (1.52 kg per 100 kg body weight). Apparent total tract DM digestibility was greater (P = 0.03) for hay (545 g kg-1) than the similar (504 g kg-1) baleage treatments. Steers selected a diet with greater in vitro true DM disappearance (71 g kg-1) and not altered by preservation method. Rumination chews per day and chews per minute and total number of boluses per day were greater (P ≤ 0.10) for DC baleage, reflecting its greater (P = 0.07) DM intake. Big bluestem dried rapidly providing an advantage for conservation in humid regions. Forage cut by 0900 h reached 800 g kg-1 DM by 1700 h when tedded and by 1100 h the second day in narrow swath. Forage cut at 1700 h reached 800 g kg-1 DM by 1500 h the next day when tedded but not until 1100 h the third day in narrow swath. Big bluestem harvested at early heading is of moderate quality when preserved as hay or DC baleage and dries rapidly giving it a role in beef production systems in the humid mid-Atlantic Region.
- Subjects
ATLANTIC Ocean Region; ANDROPOGON furcatus; HAY; FORAGE plants; RUMINATION (Digestion); PLANT conservation; HUMIDITY
- Publication
Crop Science, 2012, Vol 52, Issue 5, p2413
- ISSN
0011-183X
- Publication type
Article
- DOI
10.2135/cropsci2012.02.0123