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\hypersetup{pdftitle={Determination of Best"=fitted Regression for Estimation of Live Body Weight in Bulls and Heifers of Kenana Cattle Ecotype under Farmer's Management System in Sudan},pdfauthor={Ahmed Musa, Omer Arabi, Nahid Idam},pdfsubject={Tropentag 2016: Abstract},pdfkeywords={Correlation, Kenana Bulls and Heifers, live body weight, regression, Sudan},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 18-21, 2016, Vienna, Austria}}\\[1ex] \Large{``Solidarity in a competing world ---\\fair use of resources''\\[2ex]}}
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\Large{\textbf{Determination of Best"=fitted Regression for Estimation of Live Body Weight in Bulls and Heifers of Kenana Cattle Ecotype under Farmer's Management System in Sudan\footnote{\textbf{Contact Address:} Ahmed Musa, University of Gezira, Genetics and Animal Breeding (Molecular Genetics), Elgamaa, Wad Medani, Sudan, \mbox{e-mail}: \email{ahmed.musa12@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Ahmed Musa$^{1}$, Omer Arabi$^{2}$, Nahid Idam$^{3}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$University of Gezira, Genetics and Animal Breeding (Molecular Genetics), Sudan}}}
\item[]{\small{\textit{$^{2}$University of Gezira, Dept. of Basic Science, Sudan}}}
\item[]{\small{\textit{$^{3}$University of Gezira, Animal Physiology and Biochemistry, Sudan}}}
\end{itemize*}
\index[author]{Musa, Ahmed}
\index[author]{Arabi, Omer}
\index[author]{Idam, Nahid}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Morphological body parameters such as live Body Weight (LBW), Heart Girth (HG), Height at Withers (HTWs) and Body Length (BL) were measured on the studied population.  To evaluate the productive performance, morphological traits and determine the best fitted regression model for prediction of body weight of Bulls and Heifers of indigenous Sudanese Kenana cattle ecotype under Farmer's management system of Sudan. Totally (N= 120) animal were used (Bull calf (n) = 30, Heifer calf (n) = 30, Bulls (n) = 30 and Heifers n = 30). Data were analysed using General Linear Model (GLM) procedures when the quantitative studied traits were selected as response variables and sex and age categories as fixed factors to determine if there are significant differences in the responses across the levels of it (fixed effect). The results revealed that the overall means for live body weight (kg), Heart Girth, Height at withers and Body Length (cm) were determined as: 152.53 $\pm$ 3.53, 119.13$\pm$ 0.98, 98.09 $\pm$ 1.05 and 72.97 $\pm$ 0.96 respectively for sex and age categories. Sex and age categories significantly (P$\leq$0.05) influenced Productive performance and morphological traits. Positive and very highly significant (P$\leq$0.05) correlations were observed between Live Body Weight (LBW) and Heart Girth (HG). Correlation coefficients were much higher in Bulls in compare with Heifers age categories (0.90, 0.83, 0.99 and 0.98) respectively for Bull calf, Heifer calf, Bulls and Heifers. The best derived simple linear regression predicted equations for estimation of Live Body Weight determinated by using beta ($\beta$) as the constant based on number of variable used, coefficient of determination (R$^{2}$) and age categories as selected variable for both sexes. The Model including the most appropriate morphological measurement (Heart Girth) which was the best fitted the model ($\beta$= -194.26, -126.40, -306.69 and -325.35and (R$^{2}$ = 0.82, 0.69, 0.99 and 0.96) respectively for Bulls and Heifers age categories for estimation of Live Body Weight of Kenana cattle ecotype under Farmer's management system. Results had shown wide variations both in quantitative and morphological traits suggesting that within ecotype selection programme for improvement leads to performance improvements in this Study.}

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\noindent \textbf{Keywords:} Correlation, Kenana Bulls and Heifers, live body weight, regression, Sudan
\index[key]{Correlation}
\index[key]{Kenana Bulls and Heifers}
\index[key]{Live body weight}
\index[key]{Regression}
\index[key]{Sudan}
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