Programmed Feed Intake of High Energy Diets Influences Digestibility and Maintenance Requirements of Beef Cattle
Wells, Robert Sean
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/83570
Description
Title
Programmed Feed Intake of High Energy Diets Influences Digestibility and Maintenance Requirements of Beef Cattle
Author(s)
Wells, Robert Sean
Issue Date
2004
Doctoral Committee Chair(s)
Faulkner, Dan B.
Department of Study
Animal Sciences
Discipline
Animal Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Animal Culture and Nutrition
Language
eng
Abstract
Four studies were conducted to determine the effects of programmed feed intake of high-energy diets and how it influences digestibility and maintenance requirements of beef cattle. In the first experiment, 32 cows were used in a lactation study to determine the effects of program fed soyhulls on cow lactation and performance. Program feeding of corn or soyhull based diets outperformed (P < 0.05), higher weight gains, ADG, and BCS, the ad libitum forage diet. No differences were observed for calf performance, or lactation parameters. In the cull cow study, programmed feeding increased diet digestibility (P 0.05) on carcass or visceral organ parameters. In the second experiment, feeding a programmed intake of high-energy diet will allow heifers to exhibit estrus at an adequate age to first calve at 24 months of age. A minimum of 97.5% of the heifers fed on a program fed regime were cyclic for at least one month prior to artificial insemination (P < 0.05). In the third experiment, a metabolism study was used to determine the digestibility estimates of ad libitum and program fed corn and soyhull diets as well as a forage diet. Feeding a soyhull based diet increased acetate and butyrate proportions in the rumen in comparison to the corn based diet (P < 0.05). Programmed feeding of either the corn or soyhull based diet increased rumen pH (P < 0.05). An increase of total nitrogen flow to the small intestine was observed (P < 0.05) for the ad libitum and program fed soyhull based diets. Liquid dilution rates were reduced with both the program fed corn and soyhull diets. A tendency (P < 0.20) of increased ruminal NDF digestibility was observed for program fed soyhull diet when compared to the program fed corn diet. In the fourth experiment, steers were serially harvested to determine the effects of early weaning and restricted intake on gastrointestinal tract and visceral organ mass. Programmed feeding of early-weaned steers was not effective for improving carcass or performance parameters (P > 0.05).
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
