Comparison of some Non-Linear Statistical Models to Describe the Growth Curve of Mazandaran Native Chickens

Barapour, Masih; Gholizadeh, Mohsen; Hafezian, Hasan; Farhadi, Ayob

doi:10.52547/rap.12.33.132

Cited by 1 publication

(2 citation statements)

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“…The Gompertz model also had a high degree of competence in describing the growth curve of native Chinese birds due to its lower error rate than the Logistic and von Bertalanffy models (Zhao et al., 2015). Similar results were reported in other studies (Barapour et al., 2021). It was also reported that the Gompertz model fitted as the best model for slow‐growing Thai native chickens (Boonkum et al., 2021).…”

Section: Resultssupporting

confidence: 93%

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Genetic variance components of the growth curve for Isfahan indigenous chicken

Ghaderi‐Zefrehei,

Rafeie,

Zakizadeh

et al. 2024

Veterinary Medicine & Sci

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BackgroundBeing able to model a growth curve using three or four non‐linear functional parameters could help explain the growth phenomenon in a precise way and would allow the comparison of an animal's development rate, optimize management and feeding strategies and guide animal production strategies.ObjectiveThe goal of this study was to estimate the genetic parameters of growth traits of Isfahan indigenous chicken in Iran and to determine the best non‐linear model describing the growth curve.MethodsThe prediction of additive genetic parameters was performed using the REML method by WOMBAT. Direct heritability of the studied traits and genetic correlations between them were obtained. The Logistic, Gompertz, von Bertalanffy, Brody, Negative exponential, Weibull, Janoschek and Bridges models were compared based on the coefficient of determination (R2), mean square error (MSE) and akaike information criterion.ResultsThe Gompertz model was identified as the best model for describing the growth curve for Isfahan native chicken. The heritability of maturity weights (A), initial weight (B) and maturity rate (K) parameters were 0.223 ± 0.002, 0.016 ± 0.005 and 0.087 ± 0.001, respectively.ConclusionThis study shows that Isfahan indigenous chicken has the genetic potential for improving growth and reproduction based on their desirable heritabilities and correlations using appropriate models.

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Section: Resultssupporting

confidence: 93%

“…In our study, the value of asymptotic weight (2037.3) agreed with the value reported by Barapour et al. (2021) for Mazandaran native chicken. The B and C parameters in the Gompertz model were 3.86 and 0.0240, respectively.…”

Section: Resultssupporting

confidence: 92%