Abstract: [Objective] To characterize the laying performance of commercial Lohmann pink-shell laying hens in large-scale poultry farm. [Method] The data of laying rate and accumulative egg production of a total of 90 thousand Lohmann pink-shell laying hens aged 18-85 weeks were collected. Laying rate was analyzed using the fitting models of McMillan, Yang-Ning and Wood, respectively. Accumulative egg production was analyzed using the fitting models of Bertalanffy, Gompertz and Logistic, respectively. In addition, both the fitted values of laying rate and accumulative egg production were compared with the actually observed values. [Result] The fitting degrees of laying rate curves for McMillan model, Yang-Ning model and Wood model were 0.935, 0.997 and 0.450, respectively, and the predicted value of Yang-Ning model was the closest to the actually observed value. Gompertz model showed the best fitting effect on accumulative egg production curve with a fitting degree of 0.996, and the predicted inflection point of laying week and corresponding egg production were 47.38 and 166.36, respectively. Furthermore, the fitted maximum egg production was 365.12, which was 11.64 less than the actually observed value. [Conclusion] Yang-Ning model and Gompertz model have the best fitting effects on laying rate and accumulative egg production of commercial Lohmann pink-shell laying hens, which can be applicable to estimate and predict the laying performance of commercial Lohmann pink-shell laying hens in large-scale poultry farm.

Key words: large-scale breeding, commercial lohmann pink-shell laying hens, laying rate, accumulative egg production, curve fitting