Order Identification of the Dynamic Heat Production Response of Broiler Chickens to Step Changes in Temperature and Light Intensity
2003
Aerts, J. M. | Buyse, J. | Decuypere, E. | Berckmans, D.
In this research, the aim was to identify the order of the dynamic response of heat production of broiler chickens to steps in air temperature and light intensity. A total of 60 step experiments were performed with air temperature, and 181 step experiments were performed with light intensity. Each step experiment was modeled using a transfer function model. For each experiment, the order of the dynamic heat production response was determined using the Young identification criterion (YIC). Dynamic response of heat production to steps in temperature showed a first–order response in 43 of the 60 experiments (i.e., 72%) and a higher–order response in the other cases (28%). Dynamic response of heat production to steps in light intensity showed a first–order response in 130 of the 181 cases (72%) and a higher–order response in the remaining 51 steps (28%). Based on modeling accuracy in terms of R2, applying the higher–order models improved the accuracy only in a minority (2% to 5%) of the cases. As a conclusion, it can be stated that, in general, the dynamic response of heat production of broiler chickens to step changes in air temperature and light intensity can be modeled assuming first–order dynamics.
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