
24/02/2025
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A fully functioning bull will be able to successfully serve 47 out of 50 cows/heifers in a 9-week mating period. If your bull is unable to do this, he is considered sub-fertile.
Ideally all working bulls should undergo an annual fertility exam before the breeding season begins to avoid using sub-fertile animals. It is estimated that approximately 20% of bulls are sub-fertile! Newly purchased bulls should be tested as soon as possible. Sub-fertile bulls are still able to serve cows and so their poor fertility can risk going unnoticed until scanning.
Infertile bulls are usually easy to detect, as all cows served will return to oestrus. However, sub-fertile bulls are much harder to identify without testing, as some cows will become pregnant, but conception rate will be much lower than a bull with optimal fertility.
Infertility and reduced fertility are most commonly caused by poor quality semen, physical defects, or inability to mate effectively. This may be genetic, caused by injury, or change as the bull ages.
A bull fertility exam includes:
- Clinical exam
- Full examination of internal and external reproductive organs
- Semen collection
- Semen evaluation looking at quantity and appearance of ej*****te, gross motility, and progressive motility
Questions about fertility? Get in touch with our clinic on 01353 658241 and we'll put you in touch with our knowledgeable teamโ๏ธ