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


     

Journal of Dairy Science Vol. 80 No. 3 550-557
© 1997 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 Johnson, J. C.
Right arrow Articles by Utley, P. R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Johnson, J. C., Jr.
Right arrow Articles by Utley, P. R.

Yield, Composition, and In Vitro Digestibility of Temperate and Tropical Corn Hybrids Grown as Silage Crops Planted in Summer

J. C. Johnson Jr. 1, R. N. Gates 1, G. L. Newton 1, J. P. Wilson 1, L. D. Chandler 1, and P. R. Utley 1

1 The University of Georgia, Coastal Plain Station, Tifton 31793-0748

Following the harvest of corn silage crops that were planted in spring, second crops of one temperate and four tropical corn hybrids were planted under conditions of minimum tilling in four replications on August 3, 1992 and harvested on October 11, 1992 (yr 1). During the 2nd yr, second crops were planted on July 21, 1993 and harvested on October 19, 1993. Dry matter yields of the hybrids ranked similarly for both years but differed among hybrids, ranging from 7800 to 11,430 kg/ha (yr 1) and from 8470 to 13,150 kg/ha (yr 2). The temperate hybrid yielded 20% (yr 1) and 26% (yr 2) less than the lowest yielding tropical hybrid. The proportion of grain in the dry matter (DM) differed across hybrids, ranging from 14.3 to 32.2% during yr 1 and from 18.0 to 32.4% during yr 2. Composition of the DM, excluding grain, also differed for the hybrids: acid detergent fiber ranged from 38.0 to 42.2% during yr 1 and 40.0 to 48.8% during yr 2; in vitro digestible DM ranged from 60.9 to 65.1% during yr 1 and from 53.0 to 64.6% during yr 2. The temperate hybrid was the highest in acid detergent fiber and the lowest in in vitro digestible DM. Lower digestibility during yr 2 was attributed to disease, which infected 24.9 to 40.4% of the foliage of tropical hybrids and 84.3% of the temperate hybrid. Whole plant DM digestibilities differed narrowly in yr 1 (68.8 to 70.4%) but differed widely in yr 2 (62.2 to 69.9%). There were important differences among yields and compositions of tropical hybrids planted in summer, but all were superior to the temperate hybrid.

Key Words: corn forage composition • tropical corn • in vitro digestion • corn forage yields

Submitted on January 11, 1996
Accepted on May 24, 1996




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
L. R. Kennington, C. W. Hunt, J. I. Szasz, A. V. Grove, and W. Kezar
Effect of cutting height and genetics on composition, intake, and digestibility of corn silage by beef heifers
J Anim Sci, June 1, 2005; 83(6): 1445 - 1454.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1997 by the American Dairy Science Association ®.