Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Experimental comparison of methods for simultaneous selection of two correlated traits in Tribolium. 2. Index selection and independent culling levels : a replicated single generation test | Génét. Sél. Evol. 1986 18 4 437-446 Experimental comparison of methods for simultaneous selection of two correlated traits in Tribolium. 2. Index selection and independent culling levels a replicated single generation test . CAMPO and Carmen RODRÍGUEZ Departamento de Genética Cuantitativa y Mejora Animal Institute National de Investigations Agrarias Carretera de La Coruna Km 7 28040 Madrid Spain Summary Index selection I was compared with independent culling levels N in ten replicates of a single generation selection experiment. Two correlated traits egg laying between 7 and 11 days after adult emergence and adult weight at 12 days were selected in Tribolium castaneum. Selection criteria included family means for egg laying and individual phenotypic values for adult weight. The response to index selection was greater than the response to independent culling levels for the aggregate genotype and the difference was highly significant P 001 . The predicted response to independent culling levels was slightly less than that for index selection for the aggregate genotype. The very large difference found in the index line relative to culling level line could be due to the fact that family selection was used for egg laying. Responses obtained for both individual traits were also greater in the selection index line and the difference was significant p 001 for egg laying but not for adult weight . A greater response would be expected in the selection index line for each individual trait when optimum culling proportions are used in the culling levels line. Independent culling levels should be considered in practice as a relatively simple but inefficient selection method to improve egg laying and adult weight. _ . Key words lndex selection independent culling levels correlated traits single generation test Tribolium castaneum. Resume Comparaison experimentale de methodes de selection pour I amelioration de deux caractères corrélés chez .
