Eficiências relativas de métodos de seleção de famílias endogâmicas em milho-pipoca - DOI: 10.4025/actasciagron.v31i2.578

The study aimed to evaluate the relative efficiency of mass selection, among, within and of proposed new index of combined selection. The index, based on genealogy, was obtained by: , where is the phenotypic value of the plant Sn-1; is the phenotypic value of the Sn family, descendant of the Sn-1 plant; b1 is the weight of the individual phenotypic value, and b 2 it is the weight of the phenotypic value of S n family. The weights were obtained by derivation, assuming that they minimize the variance of the difference between the index and the value of the plant genetic additive S n-1 . To compare the methods, families and inbred plants were used, obtained from the population of Vicosa. A selection was made for popping expansion, using the three methods in S 1 , S 2 , S 3 and S 4 generations, and the efficiency of the methods of comparing averages in popping expansion of descendants of families selected by each method in S 2 , S 3 , S 4 and S 5 was assessed. For comparison of averages, the t-test at 5% of probability was used. It is concluded that the combined selection proposal was superior to the mass selection and was, in general, higher than the selection among and within. The selection among and within was, in general, higher than the mass selection.