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Signet Meetings for Terminal Sire Breeders

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Pedigree and performance data is analysed to calculate how much of each animal’s performance is due to its breeding merit and how much is due to the environment in which it has been raised. This assessment of breeding potential is expressed as Estimated Breeding Values or EBVs.

The following EBVs are produced for Signet clients:

Terminal sire EBVs
EBV Interpretation Notes
Birthweight (kg) Negative values = lighter calves at birth High birth weights are more likely to be associated with difficult calvings
Gestation length
Negative values = shorter gestations Short gestation lengths result in easier calvings, because birthweights tend to be lower. A short gestation also increases the interval between calving and the start of mating, giving the cow more time to recover body condition.
Calving ease (direct) (%) Positive values = more unassisted calvings Estimates the percentage of unassisted calvings that can be derived from a particular sire.
200-day growth (kg) Positive values = faster growth rates Selection for faster growth will result in animals that have heavier carcases at a constant fat class or leaner carcases at a constant age.
Selection for high growth rates also tends to result in an overall increase in mature size (and therefore higher birthweights).
400-day growth (kg) Positive values = faster growth rates
Muscle depth (mm) Positive values = deeper loin muscles Selecting for these traits will increase the yield of lean meat in the carcase.
Backfat depth (mm) Negative values = leaner carcases Indicates animals capable of producing lean carcases or, if required, can be taken to heavier carcase weights without becoming overfat.


Maternal EBVs
EBV Interpretation Notes
Longevity (days) Positive values = longer breeding life Predicts the length of an animal’s breeding life in the herd.
Age at 1st calving (days) Negative values = puberty reached at an early age Herds looking to calve heifers at two years of age should identify bulls with superior (negative) EBVs for this trait. This will increase conception rates at first mating.
Calving interval (days) Negative values = cows that get back in calf more quickly This EBV can be used to breed cows with short calving intervals that get in calf again quickly.
200-day milk (kg) Positive values = more productive female replacements This EBV is the maternal component of 200-day weight. It indicates how well a bull’s heifer calves will perform when they become mothers and is greatly influenced by milking ability.
Maternal calving ease (%) Positive values = more unassisted calvings Identifies females that will calve more easily. Should not be confused with calving ease direct (see above), which is an EBV predicting how easily born a bull’s progeny will be.