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Summary
Many heifers born twin-to-bull are sterile freemartins. Early clinical diagnosis using external os absence and vagina length is recommended for cattle breeders and veterinarians to avoid economic loss.
Area of Science:
- Veterinary Science
- Animal Breeding
- Reproductive Biology
Background:
- Cattle breeding programs aim to reduce costs by increasing calves per cow, promoting twin births.
- Heifers born twin-to-bull are often unknowingly sold as fertile, but many are freemartins and sterile.
Purpose of the Study:
- To summarize freemartin etiology theories.
- To describe diagnostic methods for freemartin cattle.
- To recommend a reliable diagnostic approach for veterinary surgeons.
Main Methods:
- Review of freemartin condition etiology.
- Description of anatomical, haematological, and chromosomal characteristics.
- Comparison of diagnostic methods, focusing on clinical signs.
Main Results:
- The freemartin condition results in sterile heifers born twin-to-bull.
- Clinical signs at 3-6 weeks include absent external os and short vagina (≤12 cm).
- The clinical method is highly reliable for diagnosis.
Conclusions:
- Freemartinism is a significant issue in cattle breeding programs utilizing twin births.
- Early clinical diagnosis by veterinarians is crucial for identifying sterile heifers.
- Accurate diagnosis prevents economic losses associated with infertile breeding stock.