JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 75 No. 9 2440-2446
© 1992 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Broderick, G. A.
Right arrow Articles by Rotz, C. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Broderick, G. A.
Right arrow Articles by Rotz, C. A.

Ruminal In Vitro Degradability of Protein in Alfalfa Harvested as Standing Forage or Baled Hay

G. A. Broderick 1, S. M. Abrams 1, and C. A. Rotz 1

1 Agricultural Research Service, USDA, US Dairy Forage Research Center, 1925 Linden Drive West, Madison, WI 53706

Eighty-nine samples, 45 of standing forage and 44 of baled hay, were collected from alfalfa harvested at various maturities over three cuttings each during 2 yr. Alfalfa was cut and conditioned mechanically; samples of standing forage were collected by removing bunches of forage from windrows and freeze-drying them. Forage was allowed to field cure and was harvested at an average 80% DM as small rectangular bales; samples of baled hay were collected by coring bales after storing for 3 to 6 mo. Samples were analyzed for DM, ADF, total N, fractions of total N present as ADIN, N degraded at 0 h, and potentially degradable protein N. Ruminal protein degradation rates and escapes were estimated using an inhibitor in vitro system, assuming that ADIN was unavailable and that ruminal passage rate was .06/h. Standing forage contained smaller fractions of ADIN and N degraded at 0 h, contained a larger fraction of potentially degradable N, and had more rapid degradation rates and lower estimated protein escapes than baled hay. Mean degradation rates and estimated escapes were .171/h and 24% for standing forage and .075/h and 40% for baled hay. There were no differences in degradation rate or estimated escape because of harvest year, and neither was significantly related to maturity or to ADF concentration. Results indicate a significant advantage in ruminal protein escape, compared with grazed alfalfa, for alfalfa harvested and stored as hay.

Key Words: alfalfa protein • ruminal degradability • baled hay • standing forage

Submitted on March 9, 1992
Accepted on June 3, 1992




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
M. J. Hersom
Opportunities to enhance performance and efficiency through nutrient synchrony in forage-fed ruminants
J Anim Sci, April 1, 2008; 86(14_suppl): E306 - E317.
[Abstract] [Full Text] [PDF]

Home page
 Crop Sci.Home page
W. K. Coblentz, G. E. Brink, N. P. Martin, and D. J. Undersander
Harvest Timing Effects on Estimates of Rumen Degradable Protein from Alfalfa Forages
Crop Sci., March 19, 2008; 48(2): 778 - 788.
[Abstract] [Full Text] [PDF]

Home page
 Crop Sci.Home page
K.A. Cassida, T.S. Griffin, J. Rodriguez, S.C. Patching, O.B. Hesterman, and S.R. Rust
Protein Degradability and Forage Quality in Maturing Alfalfa, Red Clover, and Birdsfoot Trefoil
Crop Sci., January 1, 2000; 40(1): 209 - 215.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1992 by the American Dairy Science Association ®.