MODELING OF THE COMPONENTS OF LIVE WEIGHT CURVES OF HENS
Abstract
The article presents the results of descriptive modeling of the polygenically determined quantitative trait «live weight» on a wide genetic material of chickens of different genotypes, obtained during an experiment to study the effectiveness of crossing imported meat crosses with meat-and-egg females of domestic selection. In general, it can be noted that the mathematical models used by B. Gompertz, T. Bridges, F. Richards made it possible to fairly adequately describe the dynamics of increasing the live weight of chickens of different genotypes. The average percentage of deviations of the actual values of live weight from the theoretically calculated ones according to the B. Gompertz model ranged within 1.73–8.36%. The smallest discrepancies were determined in chickens of the improved subpopulation “K-5», the largest ones in birds F11 of the subpopulation “K». With the smallest discrepancy from the actually determined values, the B. Gompertz model described the live weight at the end of chicken rearing – at 10 weeks. When using the T. Bridges model, in the vast majority of the studied groups of chickens, a significant underestimation of live weight indicators at the 2nd week of life was noted – by 11.17–24.76% compared to the actual ones. Also, this model in all groups of poultry slightly overestimated the live weight at the 8th week (by 3.95–15.70%). In general, the average percentage of deviation between the actually obtained live weight indicators and the theoretically calculated ones was 1.59–8.34%. In chickens of the synthetic population «K-5», the maximum accuracy of the description of the dynamics of the live weight of chickens in early ontogenesis was obtained. The model of F. Richards, similar to the model of T. Bridges, in most groups underestimated the values of live weight at the 2nd week. This is especially clearly observed in meat-egg chickens F11 and offspring F2 – the deviations of empirical values from the actual ones are significant (13.67–20.81%). Also, the F. Richards model overestimated the live weight at the 8th week of chicken life by 3.91–13.15%. Like the previous two models, this model described with high accuracy the dynamics of the live weight of chickens during 10 weeks of growing in the synthetic population «K-5». The discrepancies between the actual and theoretically determined by the model live weight values are minimal – only 1.78%.
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