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Genetic analysis of functional longevity in Holstein cattle | ||
| journal of kerbala university | ||
| Article 1, Volume 3, Issue 4, 2007, Pages 78-83 PDF (0 K) | ||
| Abstract | ||
| Records of 1039 Holstein cattle culled during years from 1998 to 2004 at the Nasr Dairy Cattle Station, United Company for Animal Resources Ltd., Al-Soueira were analysed using general linear model within the SAS program to study the effect of some fixed factors (season and year of birth , stage of lactation and level of first milk yield ) on longevity. Results obtained that season of birth have a significant effect ( P < 0.05 ) on longevity, whereas the residual factors had a high significant effect ( P < 0.01 ). The heritability of founctional and true longevity using MIVIQUE method were 0.03 , 0.008 respectively and the corresponding heritability were 0.04 and 0.03 by using TYPE 1 method. Best linear unbiased pridiction ( BLUP ) for 24 sire using Harvey program were ranged from 17.15 to – 11.71 months respectively | ||
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