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\hypersetup{pdftitle={Stress Response of Egg"=type Chickens to different Intensive Housing Systems in Humid Tropics},pdfauthor={Olufemi Alabi, Olusoji David Adejumo, Abimbola  Oluseun Ladokun, Olujide Sokunbi},pdfsubject={Tropentag 2010: Abstract},pdfkeywords={Chickens, housing systems, poultry},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 14-16, 2010, Zurich}}\\[1ex] \Large{``World Food System  ---\\A Contribution from Europe''\\[2ex]}}
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\begin{center}
\Large{\textbf{Stress Response of Egg"=type Chickens to different Intensive Housing Systems in Humid Tropics\footnote{\textbf{Contact Address:} Olufemi Alabi, Bowen University, Animal Science and Fisheries Management, +234~Iwo, Nigeria, \mbox{e-mail}: \email{femiatom@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Olufemi Alabi$^{1}$, Olusoji David Adejumo$^{2}$, Abimbola  Oluseun Ladokun$^{3}$, Olujide Sokunbi$^{2}$}}
\end{center}
\begin{itemize*}
\item[]{\small{\textit{$^{1}$Bowen University, Animal Science and Fisheries Management, Nigeria}}}
\item[]{\small{\textit{$^{2}$University of Ibadan, Animal Science, Nigeria}}}
\item[]{\small{\textit{$^{3}$University of Agriculture  Abeokuta, Animal Physiology, Nigeria}}}
\end{itemize*}
\index[author]{Alabi, Olufemi}
\index[author]{Adejumo, Olusoji David}
\index[author]{Ladokun, Abimbola  Oluseun}
\index[author]{Sokunbi, Olujide}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{

Housing of animals in confinement is being campaigned against as a callous act because animals are not allowed to move about and are   not able to exhibit   some natural behaviours.



Chickens meant for commercial table egg production are always confined inside battery cages or kept on deep litter for maximum productivity,automation of devices and ease of general bird management.



Stress response of two commercial strains of egg"=type chickens on three different intensive housing systems was investigated. 108, 17-weeks old Super Black hens (SBL) and 108, 17-weeks old Super Brown hens (SBR) were randomly allotted to three different intensive housing systems of Partitioned Battery cage (PBC), Extended Battery Cage (EBC) and Deep Litter System (DLS) in a Randomised Complete Block Design (RCB) with 36 hens per housing system each with three replicates. The experiment which was conducted at the poultry unit of the teaching and research farm of Bowen University, Iwo, Osun"=state, Nigeria lasted 37 weeks. Parameters measured included Total White Blood Cell counts (WBC), Differential leukocytes counts and Heterophil-Lymphocyte Ratios (H/L).



Housing system has significant ($p < 0.05$) effect on the differential leukocyte counts and H/L ratios but not ($p > 0.05$) on WBC counts. Hen housed inside PBC (control) had the highest value of H/L ratio with the least value from those housed on DLS. Meanwhile, the parameters investigated were not significantly ($p > 0.05$) affected by strain.



Higher values of H/L recorded by hens housed in Partitioned (conventional) Battery Cage System is an indication of physical stress which may be attributed to cage fatigue.



















}

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\noindent \textbf{Keywords:} Chickens, housing systems, poultry
\index[key]{Chickens!housing systems}
\index[key]{poultry}
\end{document}