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Cattle Boards
Artificial Insemination (AI) for Cattle
How do you select the bull(s) you are going to breed to?
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<blockquote data-quote="cbcr" data-source="post: 821423" data-attributes="member: 16303"><p>EPD accuracy. </p><p></p><p>EPD's are calculated using complex formulas and models, using several pieces of information on an animal in the calculations. Information collected to calculate EPD's includes performance data on the animal, (birth, weaning, yearling and other measurements), and pedigree information (sire, dam, grand-sires, great grand-sires, maternal grand-sires, etc), collateral relatives, (bothers and sisters), and progeny (including progeny that are parents themselves). All performance data that relates to the animal are used and these records are adjusted for factors such as age and sex of the animal and age of the dam. All adjustment factors allow these performance records to be compared accurately in the calculations. Superior or inferior mates influence progeny records. The statistical analysis used for calculations also takes into account effects of environment (nutrition, climate, geographical location, etc.) that exists between herds. These environmental factors can be estimated because of the use of artificial insemination which, allows the same bull to be used in numerous herds across the country creating a genetic link between herds.</p><p></p><p>So if someone has a cow that was sired by a herd bull only in their herd and has an outstanding calf, the EPD of that calf is going to be affected. But if that same cow was AI sired as an example by a bull that has offspring in 50 herds then the EPD accuracy is going to be higher. The same hold true for a bull with offspring, calves in one herd= low accuracy, calves in 10 herds=a higher accuracy.</p></blockquote><p></p>
[QUOTE="cbcr, post: 821423, member: 16303"] EPD accuracy. EPD’s are calculated using complex formulas and models, using several pieces of information on an animal in the calculations. Information collected to calculate EPD's includes performance data on the animal, (birth, weaning, yearling and other measurements), and pedigree information (sire, dam, grand-sires, great grand-sires, maternal grand-sires, etc), collateral relatives, (bothers and sisters), and progeny (including progeny that are parents themselves). All performance data that relates to the animal are used and these records are adjusted for factors such as age and sex of the animal and age of the dam. All adjustment factors allow these performance records to be compared accurately in the calculations. Superior or inferior mates influence progeny records. The statistical analysis used for calculations also takes into account effects of environment (nutrition, climate, geographical location, etc.) that exists between herds. These environmental factors can be estimated because of the use of artificial insemination which, allows the same bull to be used in numerous herds across the country creating a genetic link between herds. So if someone has a cow that was sired by a herd bull only in their herd and has an outstanding calf, the EPD of that calf is going to be affected. But if that same cow was AI sired as an example by a bull that has offspring in 50 herds then the EPD accuracy is going to be higher. The same hold true for a bull with offspring, calves in one herd= low accuracy, calves in 10 herds=a higher accuracy. [/QUOTE]
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How do you select the bull(s) you are going to breed to?
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