Effective size and inbreeding in closed breeding herds of pig, 2: Prediction under selection on multiple traits
2008
Ieiri, S.(Kumamoto-ken. Agricultural Research Center, Koshi (Japan)) | Nomura, T.
Theory for predicting the effective population size and inbreeding under index selection on multiple traits was developed. The concept of heritability of selection index was used for the prediction model. The prediction theory was applied to an actual pig strain selected over 7 generations by a desired-gain selection index of daily gain, back fat thickness and rib eye area, and the predicted effective size and inbreeding coefficient were compared with the observed values. Although the difference between the predicted and observed effective sizes was relatively large in a few generations, the harmonic mean of the predicted effective size over generations was well agreed with that of observed values. The coancestry and inbreeding coefficient obtained from the predicted effective size were close to the observed values. These results suggest that the proposed theory could be used for designing closed breeding programs of pigs with index selection on multiple traits.
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