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Expected and realized genetic gain in pigs of lower bavaria part 1 realized genetic gain


Zeitschrift fuer Tierzuechtung und Zuechtungsbiologie 93(1): 80-87
Expected and realized genetic gain in pigs of lower bavaria part 1 realized genetic gain
The realized genetic changes in the Landrace population of Niederbayern [West Germany] are estimated from the official sib and progeny tests conducted in Grub [West Germany] from 1962-June 1973; 8 fattening and slaughter traits from 9210 animals, fed in groups (1962-1970), singly (1964-1970); and ad lib (1971-1973), were analyzed. Boars with more than 5 progeny groups are superior in most characters. The yearly genetic changes from 1962-1970 (group feeding) vary between -0.03 (carcass length) and -0.37 (feed efficiency) SD. Roughly 60-95% of phenotypic changes in that period are due to genetic changes. Similar results are obtained from the individually fed group. Between 1971-1973 (ad lib group) only small genetic changes in slaughter traits could be found, despite pronounced phenotypic changes. Genetic changes in feed efficiency surpassed the phenotypic ones. For daily gain, genetic changes were 75% of phenotypic ones. For the purpose of calculating the genetic changes, ad lib feeding provides the best statistical basis. In this trial, 77% of all boars have more than 1, and 46% of all boars have more than 3 progeny test groups. The corresponding figures for the other 2 categories (group feeding and individual feeding) are only 2/3 as large and descend to as few as 1/5. For ad lib feeding, the statistical material is numerically smaller, compared with the other 2 groups, and this impairs the validity of the conclusions.


Accession: 005419456



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