Estimated Breeding Value Calculator
Blend individual performance, herd average, heritability, parent EBVs, genomic reliability, contemporary group strength, and progeny records into an estimated EBV, accuracy, and expected progeny difference.
This is an educational on-farm estimate, not a replacement for a breed association or national genetic evaluation. Use records from the same trait definition, unit, age adjustment, and contemporary group whenever possible.
EBV Result
The estimate is a weighted blend of phenotype deviation, parent average, genomic EBV, and progeny deviation. EPD is reported as one-half of EBV.
| Heritability band | h2 range | Typical traits | EBV note |
|---|---|---|---|
| Low | 0.05 to 0.15 | Fertility, survival, disease traits | Individual phenotype is noisy; use relatives and more records |
| Moderate | 0.16 to 0.35 | Growth, milk yield, litter size | Own performance matters, but group quality still matters |
| High | 0.36 to 0.55 | Backfat, carcass traits, fleece traits | Phenotype and genomic tests can shift EBV more strongly |
| Very high | 0.56 and up | Some wool, type, or lab-measured traits | Selection response can be faster when measurement is consistent |
| Trait type | Preferred direction | Example EBV | Interpretation |
|---|---|---|---|
| Growth or yield | Higher | +20 lb weaning weight | Progeny are expected to average about +10 lb versus zero-EBV mates |
| Birth weight or backfat | Lower | -2 lb birth weight | Negative can be desirable when the breeding goal reduces the trait |
| Fertility interval | Lower | -4 days interval | Shorter intervals or days open usually improve reproductive efficiency |
| Optimum trait | Balanced | Near target score | Extreme high or low values may both be less useful |
| Accuracy class | Approx. accuracy | Data usually available | Decision caution |
|---|---|---|---|
| Low | Under 45% | Pedigree or one own record | Expect the EBV to move as more records arrive |
| Moderate | 45% to 70% | Own record plus genomics or relatives | Useful for screening, not a final proof for major sires |
| High | 71% to 85% | Several progeny or strong genomic evaluation | EBV should be more stable across updates |
| Very high | Over 85% | Many progeny across good groups | Still compare inside the same official evaluation |
| EBV comparison | Expected progeny difference | Mating example | Meaning |
|---|---|---|---|
| Animal A EBV +30 | EPD +15 | Mated to average cows | Progeny average about 15 trait units above the zero-EBV baseline |
| Animal B EBV +10 | EPD +5 | Mated to same cows | Animal A should sire about 10 units more progeny performance than B |
| Animal C EBV -6 | EPD -3 | Lower-is-better trait | Negative is useful if the breeding goal is lower birth weight or backfat |
| Low-accuracy EBV | Same arithmetic | Young animal | Use the EPD, but allow more room for future re-ranking |
Record caution: Do not mix raw weights, adjusted weights, and association EBVs as if they are the same measure. Keep trait definitions, units, age adjustments, and contemporary groups aligned.
Selection tip: Compare EBVs inside one breed evaluation and one base year. A strong EBV with poor accuracy can still move when progeny or genomic updates are added.
The estimated breeding values is used to make breeding decision. The estimated breeding values will help you determine how well an animal will performing in the next generation of your herd. If you have an animal that perform well, you may want to know if it will pass those trait to its offspring.
An estimated breeding value isnt simply a measurement of the weight or an amount of milk that an animal can produce. Instead, an individual calculates an estimated breeding value as a combination of the animal’s performance, genetic makeup, and the family history of that animal. Because of the number of different piece of information regarding an animal that must be evaluated, it can be difficult for many individual to make a breeding decision.
How to Use Estimated Breeding Values
For instance, an animal may have a high weaning weight, but the sire and dam of that animal may have below average traits. Additionally, the genomic test for an animal may provide a different result then the weaning weight of that animal and its progeny raised in a different environment from that of the animal to be bred. Due to this conflicting information regarding an animal, many individuals simply choose one of these measurement for breeding decisions, which isnt a systematic approach to such a decision.
In order to make use of the calculator, an individual must provide several different input regarding the animal to be evaluated. The first of these inputs is the phenotype of the animal, which determine the performance of the animal compared to the remainder of the herd. The second of these is the heritability of the animal, which determine how much of the animals phenotype can be passed along to its offspring.
The third of these is the parent EBVs, which provide an expectation of an animals performance based off its pedigree and the limited number of record of its performance. The fourth of these is the genomic reliability, which determine the trustworthiness of the DNA test for the animal prior to its breeding effort. Finally, the fifth of these is the progeny average of the animal, which determine the average performance of the animals offspring.
Each of these factor has a certain amount of noise associated with it. For traits with low heratability (like fertility), it take longer for the trait to manifest, hence, the trait has less weight in the determination of the breeding value. Traits with high heratability will have more influence over the breeding value than traits with low heratability.
Additionally, the size of the contemporary group will impact the reliability of the information provided by the progeny averages. Accuracy provide an individual with a number that indicate how stable the estimated breeding value will be. If the estimated breeding value has a low accuracy, it may be a value that is not incorrect, but may change with the addition of the progeny of that animal or the addition of a genomic update for the animal.
An individual can use the accuracy of the estimated breeding value to determine if they should use that animal in their herd, or if they should use that animal to form a breeding program for there farm. The reference table provide information regarding the various accuracy band and heritability range for these breeding programs. These tables indicate that an animal with a moderate accuracy in its estimated breeding value will provide useful information regarding the traits of the progeny of young stock, but an animal with high accuracy and many progeny will produce a more reliable value that can be use in the creation of large breeding program.
Many individuals who focus upon only a small amount of information regarding an animal make breeding mistake. For instance, an individual may focus upon only the phenotype of an animal or the genomic value of that animal. By using the calculator, however, an individual is forced to consider each of these different data point and their influence upon the estimated breeding value.
This can help an individual to determine if they need to gather additional information or if they can simply make their breeding decision. Thus, the goal in the use of estimated breeding values is to provide individuals with a clear picture of the risk that is involve in breeding a particular animal.
