Schätzung inzuchtwirksamer (effektiver) Populationsgrößen aus Genfrequenzschwankungen bei Bayerischem Fleckvieh und Tiroler Grauvieh

Frequencies of 10 to 16 alleles of blood group, hemo- and lactoprotein loci were estimated for FV in 1960, 1986 and 200, for GV in 1969, 1979 and 1998. Rates of inbreeding in the intervening periods and Ne's were derived from Wahlund variances. The Ne's for the two part periods of FV, spanning 2.2 resp. 4.1 generations, were 152 resp. 147, for the whole period of 6.25 generation intervals 373. This is due to the opposing signs of the changes in the two part periods and it may reflect the large influence of a top sire on the gene pool in the first period and ensueing change to a FV gene reservoir similar to that in 1960. For GV the Ne'of the two part periods were 139 and 56, for the whole 97, roughly in agreement with the one expected from the two short periods. The lower Ne of the second part period agrees well with an estimate by the inbreeding increment in roughly the same time period.