EVALUATION OF FOUR NONLINEAR MODELS DESCRIBING EGG PRODUCTION CURVE OF FAYOUMI LAYERS

Egg production data used in this work were obtained from records of Fayoumi chickens flock belongs to El-Takamoly poultry project at Al-Azab, Fayoum Governorate. over a 52-wk egg laying period related 1900 hens. All was summarized on weekly basis as eggs per hen week hen-day (survivor) basis. Regarding Wood and McNally models, (a) stands for initial production, parameter value very low (0.001) both models. The increasing rate the peak (parameter b) 2.90 model 2.19 model. Similarly, c, decreasing peak, estimated be 0.08 0.06 Depending compartmental function m, n, p q represent scale parameter, measure persistency sexual maturity rate, age first egg, respectively values these parameters 86.47, 0.01, 0.23 21.61 wks age, respectively, Concerning modified A, B, C D  decrease ability, reciprocal indicator variation and  mean hens, respectively. In abovementioned 75.26, 0.006, 1.14 24.96 D According goodness fit criteria, best describing egg-laying pattern layers which had lowest Akaike information criterion Bayesian highest coefficient determination. Moreover, showed correspondence with actual day (age percentage 29.44 weeks 64.16%, respectively).