2019
DOI: 10.4025/actascianimsci.v41i1.45990
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A sinusoidal equation as an alternative to classical growth functions to describe growth profiles in turkeys

Abstract: Because of the relatively long growing cycle and the high cost of research into turkey production and nutrition, the potential benefits from modelling growth in this avian species are considerable. Though there are many studies aimed at evaluating animal growth models, the number of studies targeting growth models in turkeys is quite limited. In this paper we present a sinusoidal function to describe the evolution of growth in turkeys as a function of time based on data published by Aviagen. The new function w… Show more

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Cited by 5 publications
(7 citation statements)
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References 17 publications
(15 reference statements)
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“…The Sinusoidal model did not converge for both sexes in the present study, even if contextually, recent studies conducted in turkeys have reported the Sinusoidal model to be the best-fitting model for growth (Kuhi et al 2019). These differences may be a consequence of the properties of the data that was used, since Kuhi et al (2019) used average values, while in the current study, the results were obtained from individual observations taken from the studied population.…”
Section: Fitting and Flexibility Criteria Model Comparisoncontrasting
confidence: 84%
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“…The Sinusoidal model did not converge for both sexes in the present study, even if contextually, recent studies conducted in turkeys have reported the Sinusoidal model to be the best-fitting model for growth (Kuhi et al 2019). These differences may be a consequence of the properties of the data that was used, since Kuhi et al (2019) used average values, while in the current study, the results were obtained from individual observations taken from the studied population.…”
Section: Fitting and Flexibility Criteria Model Comparisoncontrasting
confidence: 84%
“…Table 2 presents the functions for the seven non-linear models selected in the present study which were namely; Richards, Brody, Logistic, Verhulst (a variant of Logistic model), Gompertz, Sinusoidal, and Von Bertalanffy (Ersoy et al 2006;Nogales et al 2017;Kuhi et al 2019). The fitting procedure was developed using multiple observations of the dependent variable (weight) for each point of the independent variable (day of life).…”
Section: Model Developmentmentioning
confidence: 99%
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“…However, to evaluate which model provides a better approximation of DIM at peak milk yield, lactation curves with daily records would be necessary to assess the time at which peak yield occurs. Estimates of DIM and milk yield at peak and of total milk production with the Richards, Schumacher and sinusoidal functions are comparable to those reported elsewhere (Metry et al, 1994;Şahin et al, 2015;de Carvalho et al, 2020) using conventional lactation models (e.g., Wood's equation) for different breeds of buffalo. Compared with conventional lactation models, which are sensitive to missing test-day records, especially at early DIM (Adediran et al, 2007;Wasike et al, 2011), fitting nonlinear growth functions to cumulative production records would be influenced to a much lesser degree by few missing records (López al., 2015).…”
supporting
confidence: 78%
“…These handicaps can be surmounted by using cumulative lactation curves (López et al, 2015). Currently, the suitability of sinusoidal functions, as newly applied equations, is confirmed for describing growth curves in broiler chicks, quail, dairy heifers and turkeys (Darmani Kuhi et al, 2018Kuhi et al, , 2019aKuhi et al, , 2019bKuhi et al, , 2019c. Therefore, the objective of this study was to investigate the suitability of sinusoidal and conventional growth functions (viz.…”
mentioning
confidence: 99%