Kadir Karakus  , Ecevit Eyduran  , Derya Kum  , Tenar Ozdemir  , Firat Cengiz  , 
    Determination of the Best Growth Curve and Measurement Interval in Norduz Male Lambs,
    Journal of Animal and Veterinary Advances,
    Volume 7,Issue 11,
    2008,
    Pages 1464-1466,
    ISSN 1680-5593,
    javaa.2008.1464.1466,
    (https://makhillpublications.co/view-article.php?doi=javaa.2008.1464.1466)
    Abstract: The aim of this study, was to determine the best non-linear model and measure interval (biweekly or monthly) in explaining the body weight-age relationship in Norduz male lambs born in 2004. For this aim, Brody, Logistic, Gompertz and Richards non-linear models were fitted to the average body weight-age data with 15 (biweekly) days and 30 (monthly) days of measure intervals. Although, Logistic model become equal to Richards model (99.8%) for two intervals, Logistic model had lower RMSE than Richards model. Therefore, the best non-linear model for 2 intervals was Logistic model having the highest coefficient of determination (R<SUP>2</SUP>) but the lowest Root of Means Square Error (RMSE). Contrary to Brody non-linear model, the usage of 30<SUP> </SUP>days of measure intervals performed positive effect on Logistic, Gompertz and Richards non-linear models instead of 15 days of measure interval. As a result, it was concluded that the best non-linear model for Norduz male lambs was Logistic model and the appropriate measure interval for Norduz male lambs was monthly interval.
    Keywords: Body weight;growth model;measure interval;norduz lambs