Inzuchtdepression bei Merkmalen der Fruchtbarkeit und der Gewichtsentwicklung beim Göttinger Miniaturschwein

Abstract. Title of the paper: Inbreeding depression for litter traits and the development of growth in the Göttinger Minipig
A data set of 1191 litters from 282 sows and 6777 piglets weights from the Göttinger Minipig was analysed to estimate inbreeding depression for litter traits and the early growth rates up to an age of 12 month. The population ofthe Göttinger Minipig shows an average inbreeding of sows and piglets of about 10% with a Standard deviation of 1.7% with a nearly normal distribution of the inbreeding coefficients in contrast to most other studies about inbreeding depression. There is no inbreeding depression observed for number of piglets bom alive or bom dead within a litter, neither for inbreeding of sows nor for inbreeding of litters. For average and individual birth weights the inbreeding of sows show a significant influence while the inbreeding of the litter is not significant. With a 10 percent increase of the inbreeding of sows a reduction on individual birth weight of 70 gram is observed (70% of the phenotypic Standard deviation). For the weight of piglets in the first 6 month both the inbreeding of sows and the inbreeding of litters show a significant effect. A 10 percent increase of inbreeding of sows or litters both leads to a reduction on weight within the first 6 month of 250 gram (20 % ofthe phenotypic Standard deviation.