U radu je istražena primjena generalizirane logističke funkcije u modeliranju rasta teškog hibrida pura. Istraživanje je trajalo 19 tjedana, tijekom kojih je kontroliran rast 20 muških i 20 ženskih pura provenijencije Nicholas 700. Tijekom čitavog razdoblja tova razlike u živim težinama između purana i pura bile su statistički vrlo visoko značajne (P<0,001). Na kraju istraživanja purani su u prosjeku bili teški 15,17 kg, a pure 10,88 kg. Purani su od pura bili teži za otprilike 4,3 kg ili 39,53%. Prosječni tjedni prirasti kod purana bili su 795 g, a kod pura 577 g, dok su prosječne stope rasta u tovu teškog hibrida bile 12,45% (mužjaci) i 12,11% (ženke). Procjene točke infleksije i pojedinih faza rasta po spolu pura obavljene su primjenom generalizirane logističke funkcije:
Koeficijenti asimetrije bili su γ=0,2 (purani) i γ=0,3 (pure). Biološki maksimum za purane bio je 18,57 kg a za pure 12,63 kg. Prema izračunatim parametrima točka infleksije kod pura je početkom, a kod purana sredinom 10.tjedna tova kada su teški 5,27 kg (pure) i 7,46 kg (purani). Na temelju rezultata primijenjenog modela (generalizirana logistička funkcija) u opisivanju rasta pura teškog hibrida može se istaknuti skako ženke završavaju intenzivnu fazu rasta skoro tjedan dana ranije nego mužjaci, a točka infleksije kod pura nastupa ranije nego kod purana.The objective of this study was to investigate the application of generalized logistic function to the heavy hybrid turkey growth modeling. The growth of 20 turkey toms and 20 turkey hens of Nicholas 700 provenience was monitored over 19 weeks. During the whole fattening period, differences in live weights between males and females were statistically highly significant (P<0.001). At the end of the experiment, turkey toms weighed on average 15.17 kg, compared to 10.88 kg of average turkey hens live weight. Males weighed approximately 4.3 kg or 39.53% more than females. Average weekly gain of turkey toms was 795 g, and of turkey hens 577 g. Average growth rate of turkey toms was 12.45% and of turkey hens 12.11%. Evaluation of inflection point and each growth phase for both turkey sexes was carried out by using generalized logistic function:
Coefficients of asymmetry were γ=0.2 (males) and γ=0.3 (females). Biological maximum was 18.57 kg for males, and 12.63 kg for females. According to calculated parameters, inflection point in turkey hens occurred at the beginning of the 10th week of fattening, when they reached 5.27 kg; in turkey toms it occurred in the middle of the 10th week, at the weight of 7.46 kg. On the basis of the results obtained by using the model of generalized logistic function for turkey growth rate description, it was concluded that turkey hens ended their intensive growth phase about a week earlier than turkey toms, with the inflection point also starting earlier than in turkey toms
