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Atresia coli in a twin calf
Journal of the American Veterinary Medical Association
|September 1, 1977
Summary
Atresia coli, a congenital condition, was diagnosed in a newborn calf. Genetic analysis of identical twins from embryo transfer suggests the condition was likely not hereditary in this case.
Area of Science:
- Veterinary Medicine
- Genetics
- Embryology
Background:
- Atresia coli is a rare congenital defect in cattle, characterized by the absence of the colon.
- Understanding the etiology of congenital defects is crucial for animal health and breeding programs.
- Identical twins offer a unique opportunity to study genetic versus environmental influences on development.
Observation:
- A newborn calf presented with diagnosed atresia coli.
- The calf was an identical twin, confirmed by identical blood type and electrophoretic patterns (hemoglobin, transferrin, amylase).
- The co-twin was clinically normal, despite originating from the same embryo.
Findings:
- The identical twin calves resulted from the cleavage of a single embryo post-embryo transfer.
- The presence of atresia coli in one twin and normal development in the other, despite identical genetics, points away from a simple hereditary cause.
- Biochemical markers confirmed the twins' identical genetic makeup.
Implications:
- The findings suggest that factors other than simple inheritance, potentially developmental or epigenetic, may play a significant role in the pathogenesis of atresia coli.
- This case highlights the complexity of congenital defects, even in genetically identical individuals.
- Further research into non-hereditary causes could inform preventative strategies and improve outcomes for congenital anomalies in livestock.