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Bull breeding assessment
Synonym(s): Bull breeding soundness examination (BBSE)
Introduction
- Bull breeding assessment is generally used to identify subfertile bulls:
- Complete infertility is very rare in bulls.
- At any given time, a herd could have anywhere between 10% and 20-40% subfertile bulls.
- A fertile bull should be able to get 70% of normal cycling cows pregnant within 3 weeks and 90% within 60-80 days. For every 21-day period a cow is open, there could be a resultant loss of 23-27 kg weaning weight.
- There is a 5% greater pregnancy rate in cow herds exposed to a bull that has passed a bull breeding assessment1. Bulls passing a breeding assessment have a 6% or greater fertility advantage over untested bulls.
- There are various standardized check lists available. The author is UK based and recommends the BCVA Bull Breeding Certificate Pads (available at www.bcva.org.uk).
Preparation
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On farm
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Physical examination
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Reproductive examination
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Semen collection
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Semen analysis
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Outcomes
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Further reading
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