Journal
LIVESTOCK PRODUCTION SCIENCE
Volume 79, Issue 2-3, Pages 233-238Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0301-6226(02)00170-7
Keywords
complex vertebral malformation; CVM; fertility; cattle; Holstein
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Previous studies have indicated that the viability of bovine foetuses affected by complex vertebral malformation (CVM) is reduced. To study this a data analysis was performed. Breeding data on Holstein cows being daughters of confirmed CVM carriers and inseminated first time after calving with semen of a sire with, established CVM status (normal or carrier) were used. A total of 62 602 inseminations were included. The analysis demonstrated, that several fertility traits, defined as non-return rates for cows, frequency of calvings after first insemination and interval from insemination to next calving, were significantly affected by a foetal CVM phenotype. Non-return to service rates were severely reduced. Data on calvings 260-300 days after first insemination demonstrated that 77% of the CVM-affected foetuses were aborted prior to gestation day 260. A foetal CVM phenotype increased the maternal risk of being culled. (C) 2002 Published by Elsevier Science B.V.
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