Effect of cool roost and carbonated drinking water on performance and bone characteristics of chicken hens in hot environments
Madindou, Joseph Thomas
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https://hdl.handle.net/2142/21719
Description
Title
Effect of cool roost and carbonated drinking water on performance and bone characteristics of chicken hens in hot environments
Author(s)
Madindou, Joseph Thomas
Issue Date
1994
Doctoral Committee Chair(s)
Harrison, Paul C.
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
Two experiments were conducted to determine the effect of providing water-cooled roosts and carbonated drinking water on production performance, bone characteristics and blood parameters in heat stressed pre-molted and post-molted laying hens.
In the first experiment, hens provided cool roosts produced greater $(P\leq.05)$ egg yield and consumed more feed than hens provided air roosts regardless of water treatment. In Experiment 2, hens provided air roosts with carbonated water showed increased $(P\leq.05)$ egg production and egg yield, but these variables were decreased for hens provided roosts with carbonated drinking water. Hens provided cool roosts ate more feed than hens on air roosts, but carbonated water increased feed efficiency above air roost.
In Experiment 1, hens provided air roost with either tap or carbonated drinking water had greater $(P\leq.05)$ tibia bone breaking strength per 100g body weight. Cool roost improved section modulus of hens provided carbonated water, but decreased tibia section modulus of in hens consuming tap water. Carbonated water increased tibia material strength of hens provided air roosts but decreased it for hens provided carbonated water. In both experiments, tibia sodium concentration was greater $(P\leq.05)$ for hens provided cool versus air roosts. In Experiment 2, carbonated drinking water improved total tibia CO$\sb2$ content.
In both experiments, percent lymphocytes was increased $(P\leq.05)$ for hens provided cool versus air roosts, but percent heterophil and heterophil/lymphocyte ratio was greater $(P\leq.05)$ for hens provided air roosts versus cool roosts. Cool roost improved (P =.08) blood ionized calcium above roost. The results indicate that either cool roost or carbonated drinking water does not provide as much of beneficial enhancement in bone integrity as it does for production performance. The results suggest that these stress relieving management techniques are more effective when provided for pre-molted laying hens late in their first production cycle. In addition, it seems that when both carbonated drinking is provided along with cool roosts, the response was not synergistic. Finally, cool roost seems to be a more promising management scheme for alleviating heat stress related problems in laying hens.
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