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Title of the paper: Genetic analysis of the course of individual growth and feed intake of group-pennedPerformance tested boars Objective of the study was to analyse the course of feed intake and growth of 661 boars of three lines (259, 208,and 194 animals of lines 3, 4, and 8, respectively) during an age dependent Performance test between the 100th and 170th day of age. Individual feed intake of the group-penned animals was recorded by electronic feedingstations during the first, third, fifth, seventh, and ninth week on test. Additionally, each animal was weighted inbiweekly intervalls. A second order polynomial and a third order polynomial were individually fitted on feedintake and live weight. From these curves, individual information about daily feed intake, daily gain, and foodconversion ratio were derived for five periods of 12 days and for the entire period. Genetic parameters wereestimated simultaneously using a multiple trait animal model. Heritabilities of h2 = .50, .55, .40, and .39 for traitsof entire test period were found for backfat thickness, daily gain, daily feed intake, and food conversion ratio,respectively. Estimated heritabilities for each test period from one to five were h2 = .50, .56, .54, .50, and .37 fordaily gain, h2 = .18, .43, .46, .45, and .38 for daily feed intake, and h2 = .34, .42, .46, .44, and .39 for foodconversion. The genetic correlation between daily gain and food conversion in period one (rg = −.84) wassignificantly different from correlations between these traits in the following periods (rg = −.32 to −.51). Geneticcorrelations between daily gain and daily feed intake in each period were rg = .56 to .42 from first to last period.Except of first period (rg = −.11), the genetic associations between food conversion and daily feed intake forperiods were similar (rg = .52 to .56). The genetic associations indicate, that a high feed intake in the beginningof the fattening period is desirable, while afterwards a more reduced feed intake should be achieved to improveefficiency of fattening Performance. In order to optimise fattening Performance, the use of part test informationfrom growth rate and feed intake is necessary

Genetische Analyse des individuellen Wachstums- und Futteraufnahmeverlaufs von Jungebern während der Eigenleistungsgruppenprüfung