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Rectovaginal constriction in Jersey cattle: genetics and breed dynamics.
H W Leipold1, K Huston, E P Barton
1Department of Pathology, Kansas State University, Manhattan 66506.
Journal of Dairy Science
|September 1, 1990
Summary
Rectovaginal constriction in US Jersey cattle is inherited as a single recessive gene. Genetic modeling predicts a slow decline in the frequency of this gene with female selection.
Area of Science:
- Animal genetics
- Population genetics
- Veterinary science
Background:
- Rectovaginal constriction is a genetic disorder observed in US Jersey cattle.
- Previous studies suggested monofactorial recessive inheritance.
- Understanding the genetic dynamics is crucial for breed management.
Purpose of the Study:
- To confirm the inheritance pattern of rectovaginal constriction.
- To model the genetic dynamics and predict gene frequency changes.
- To inform selection strategies in Jersey cattle populations.
Main Methods:
- Analysis of data from farmer-owned herds and experimental matings.
- Extension of Kempthorne's population genetics model to include mutation and female selection.
- Computer simulations to estimate gene frequency decline over generations.
Main Results:
- Monofactorial recessive inheritance of rectovaginal constriction was supported.
- The extended population genetics model estimated a slow decline in gene frequency.
- Simulations provided projections for current and future conditions over 500 generations.
Conclusions:
- Rectovaginal constriction is a heritable trait in Jersey cattle.
- Female selection is predicted to slowly reduce the prevalence of the causative gene.
- The findings offer insights for managing genetic disorders in livestock breeds.