NOTE RELATIVE A LA COMPARAISON DES DESCENDANCES DE TAUREAUX DANS LE CAS D'ÉPREUVES DISCONTINUES

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Abstract
The accuracy of 2 methods for comparing the progenies of bulls tested in discontinuous series in time or space was studied when no information was available on the performances of the contemporaneous animals tested in the same farms (this is the French case of progeny-testing of beef-bred bulls for the value of their calves). With the 1st method the average performances of the progenies of 2 bulls belonging to 2 different series are expressed in relation to a progeny-tested control bull of each series. With the 2nd method, the average performances are expressed in relation to that of all other bulls of the same series. The accuracies of the 2 methods are expressed and compared depending upon the number of bulls in each series of test, the number of offspring per bull, and the coefficient of herltabllity of the character considered. Under the most common practical conditions of testing beef-bred bulls for the value of their calves (more than 5 bulls per series, 50 calves per bull, coefficient of herltabllity ranging from 0.10 to 0.30) the 2nd method appears better in some respects.

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