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A 14/20 chromosome translocationp in Simmental cattle
R A McFeely1, L R Klunder, J A Reed
1Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.
Journal of the American Veterinary Medical Association
|February 15, 1993
Summary
A chromosomal abnormality, the 14/20 translocation, was found in Simmental cattle herds in the US. Caution is advised for breeding stock due to potential fertility issues and widespread dissemination via artificial insemination.
Area of Science:
- Veterinary Genetics
- Animal Breeding
- Cytogenetics
Background:
- A specific chromosomal abnormality, the 14/20 translocation, has been identified in Simmental cattle.
- The translocation was traced to a common sire whose semen was widely used for artificial insemination.
Purpose of the Study:
- To report the identification of the 14/20 translocation in US Simmental cattle.
- To highlight the potential implications for cattle breeding and fertility.
Main Methods:
- Cytogenetic analysis to identify the 14/20 translocation.
- Pedigree analysis to trace the origin of the translocation.
Main Results:
- The 14/20 translocation was confirmed in two Simmental cattle herds.
- A single bull, used extensively for artificial insemination, was identified as the carrier sire.
- A substantial portion of the US Simmental population may potentially carry this translocation.
Conclusions:
- The widespread use of the carrier sire necessitates caution in selecting breeding stock.
- Further research is needed to determine the exact impact of the 14/20 translocation on fertility.
- Preventing the dissemination of this translocation is crucial for maintaining herd fertility.