Poult. Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

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 Gordon, R.
Right arrow Articles by Roland, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Gordon, R.
Right arrow Articles by Roland, D., Sr
Poultry Science, Vol 76, Issue 5, 683-688
Copyright © 1997 by Poultry Science Association

Articles

The influence of environmental temperature on in vivo limestone solubilization, feed passage rate, and gastrointestinal pH in laying hens

RW Gordon and DA Roland Sr

Department of Poultry Science, Auburn University, Alabama 36849, USA.

Several studies were conducted to determine whether suppression of in vivo limestone solubilization was partially responsible for the reduction of shell quality under conditions of high environmental temperatures. In Experiment 1, excreta from hyperthermic and thermoneutral hens fed three levels of Ca (3.5, 4.3, and 5.2%) at two cycling environmental temperatures (averaging 28.3 and 26.1 C) were analyzed for percentage in vivo limestone solubilization. Hens in Experiment 2 received diets containing 3.9% Ca at 32.8 and 18.3 C. Rate of feed passage and gastrointestinal pH were also measured in Experiment 2. Experiment 3 evaluated the influence of temperature (22.2 and 30.0 C) and feed consumption on percentage limestone solubilization when Ca intake was held constant. In vivo limestone solubilization was influenced by Ca level in Experiment 1, but not by temperature. Hyperthermic hens solubilized a higher percentage of limestone than thermoneutral hens in Experiment 2, but it was concluded that this was due to a difference in Ca consumption and not due to temperature directly. When Ca intake was held constant in Experiment 3, there was no difference in limestone solubilization at the temperatures tested. Rate of feed passage was 16.6% slower in the hyperthermic hens. Crop, proventriculus, and upper small intestine pH were similar at each temperature, but gizzard pH was significantly lower in the hyperthermic hens. It was concluded that the high environmental temperatures used in the present studies did not suppress in vivo limestone solubilization.


This article has been cited by other articles:


Home page
 J. Biol. Chem.Home page
D. J. McNally, M. P. Lamoureux, A. V. Karlyshev, L. M. Fiori, J. Li, G. Thacker, R. A. Coleman, N. H. Khieu, B. W. Wren, J.-R. Brisson, et al.
Commonality and Biosynthesis of the O-Methyl Phosphoramidate Capsule Modification in Campylobacter jejuni
J. Biol. Chem., September 28, 2007; 282(39): 28566 - 28576.
[Abstract] [Full Text] [PDF]


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