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New Mexico | Twinner bulls used on cowherds which have not shown much twin factor, DO tend to twin some with the use of said bull.
What the boils down too is that there are extra eggs every once in a while dropped that get covered by the more fertile bull.
The reason I feel the twinner bulls have a higher statistical ratio on is perhaps due to an extended "longevity" factor of the spermatic fluid, which may allow sperm an extra 6 to 16 hour life span in the vaginal tract.
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