Comparison of Growth Curve Using Some Nonlinear Models in Broiler Production
2016
Eleroglu, Hasan | Bircan, Hudaverdi | Yildirim, Arda | Kilic, Firdes
In this study, which was conducted to compare the growth of commercial broiler chicks using non-linear models, 240-day old (gender-diverged) called Ross 308 broilers were utilized. They were divided into 20 chicks with 10 males and 10 females per section (mixed male and female) and were randomly distributed into 3 repetitions in randomized block design. During the six-week trial performed weekly individual weighing body weight data were collected. Gompertz and Logistic Models were used to compare growth curves. In Gompertz and Logistic Models, adult weights (β0) were found as 4364.53 and 3010.32 g respectively. Although the integration coefficient (β1) is calculated as 4.62 in the Gompertz model, this value is 31.52 in the logistic model, which is higher than the Gompertz model. The instantaneous growth rate (β2) was 0.356 and 0.835 for Gompertz and Logistic Models, respectively. The Bending Point Age (BNY) was estimated to be 4.31 and 4.13, the Bending Point Weight (BNA) was estimated to be 1605.79 and 1505.16 g weeks in Gompertz and Logistic Models, respectively. The highest growth rate (EBP) was found to be 568.82 and 628.17 g respectively in Gompertz and Logistic Models. The coefficient of determination (R2) and adjusted coefficient of determination (adj.R2) values calculated from both models range from 0.997 to 0.999.
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