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Relevance of Exterior Appraisal in Pig Breeding

Evert J. van Steenbergen

出版	Landbouwuniversiteit te Wageningen, 1990
URL	http://books.google.com.hk/books?id=rWXjHwAACAAJ&hl=&source=gbs_api

註釋

When assuming a nihil economic value for gait pattern and rejecting 25 or 50% of the boars in the first stage, then economic merit is reduced by 13 or 24%, respectively.The accuracy of the estimated breeding value for growth performance, based on an own performance index with the index traits: daily growth, backfat thickness, and daily feed intake, shows a minor increase when exterior traits describing size and structure of the body are included in the index.Exterior traits and constitution.In practice most interest for exterior traits is because of the expected correlations between exterior traits and longevity as determined by the animals constitution.