MODELS OF MAXIMUM GROWTH ESTIMATION IN FATTENING PROVENIENCES OF BROILERS

The objective of this study was to find the mathematical model which gives the best results in estimation of biological growth maximum of fattening chicken. Used models were: general exponential function, von Bertalanffy´s model, logistic function and generalized logistic function. In the investigations of growth characteristics Avian 24 K, Arbor Acres and Ross 208 proveniencies of broilers were used. The results of the research show that the best data for estimation of biological maximum of chicken growth in relation to sex ensures generalized logistic function with γ = 0.18 (asymmetric S-function). The asymptotic value of A for male chicken was, respectively: 5.72 kg, 5.90 kg and 4.47 kg, and for female chicken: 4.06 kg, 4.75 kg, 4.46 kg. In case of segregated fattening regarding gender, ability of live weight estimation of chicken at certain age is of great importance for optimal utilization of genetic potential and obtaining higher flock uniformity at delivery and slaughtering of the chickens