tailieunhanh - báo cáo khoa học: "Growth curves of highly inbred lines of fowl and their F hybrids 1 HYÁNEK R. ŠILER Milena VILHELMOVÁ"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Growth curves of highly inbred lines of fowl and their F hybrids 1 HYÁNEK R. ŠILER Milena VILHELMOVÁ | Génét. Sél. Evol. 1983 15 4 533-558 Growth curves of highly inbred lines of fowl and their Fl hybrids Helena KNIZETOVA B. KNIZE J. HYÁNEK R. SILER Ludmila HYÁNKOVÁ J. PLACHÝ Milena VILHELMOVÁ Department of Experimental Zoology Charles University Vinicná 7 128 44 Prague 2 Czechoslovakia Institute of Animal Production 251 61 Prague 10-Uhnn eves Institute of Molecular Genetics CSAV Flemingovo 2 160 00 Prague 6 Summary Growth curves based on the Richards function are evaluated for four highly inbred lines of fowl Fx p. 100 and some of their F hybrids. The largest deviations of the estimated course of growth maximum p. 100 in terms of live weight occurred before 6 weeks of age inbred and hybrid groups showed a tendency to deviate in opposite direction as a result of differences in adaptive behaviour during the posthatching period. Another deviation in some groups was an overestimation of the asymptote in relation to the observed values for final weight. Interline differences occurred in age and weight at the inflection point the asymptotic weight the shape of the curve and the parameters of the growth rate. The overall evaluation of lines and hybrid combinations showed that except for the proportion of asymptotic weight reached at the inflection point the genetic variation in these parameters was relatively high. Several Fj hybrids showed significant heterosis in growth rate and in weight whereas the shift of the inflection point to an earlier age was mostly insignificant. Key words Chicken inbred lines growth curves heterosis. Résumé Courbes de croissance de lignées de volailles hautement consanguines et de leurs hybrides Fị Des courbes de croissance dérivées de la function de Richards ont été établies dans 4 lignées de volailles hautement consanguines Fx 99 9 p. 100 ainsi que chez certains de leurs croisements Fl. Les écarts les plus importants en termes de poids vif entre crois-sance réelle et estimée maximum 9 3 p. 100 sê manifestent jusqu a un âge de 6 .

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