Day-to-Day Variation in the Feed Consumption of Dairy Cows in Early Lactation
Shah, Mohammad Abid Pervez
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/2142/83538
Description
Title
Day-to-Day Variation in the Feed Consumption of Dairy Cows in Early Lactation
Author(s)
Shah, Mohammad Abid Pervez
Issue Date
2001
Doctoral Committee Chair(s)
Murphy, Michael R.
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)
Biology, Animal Physiology
Language
eng
Abstract
A final 9-wk experiment studied the performance of 24 Holstein cows during the transition period. Cows were assigned to either a control or a liquid-flavored (0.52 ml/kg of feed) totally mixed ration in a randomized complete-block design. Weekly means of DMI, milk production, and body weight were analyzed. Individual cow daily DMI data were fitted to the exponential model. There was no effect of treatment on these variables or the fractional rates of increase in DMI. Multiple regression analysis suggested that more body weight was mobilized per unit increase in 3.5% fat-corrected milk in cows fed the control diet, and those cows tended to be in more negative energy balance than cows fed the flavored diet. Parameters of both the exponential and cosinor models were associated with various pre- and post-parturn production variables. Plasma progesterone concentrations were positively correlated with DMI. It was concluded that feeding the flavor improved the energy balance of cows in early lactation and may reduce the risk of health or reproductive problems. Overall, the exponential model was consistently more accurate and robust than the current NRC equation. Together with cosinor model it explained most of the day-to-day variation in the feed consumption of dairy cows in early lactation. The association between plasma progesterone and DMI was also confirmed.
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.
