Ai manual chapter 13
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The document discusses ABS's dairy and beef sire selection processes. For dairy, most sires come from special matings of high-PTA cows and bulls. Progeny testing involves placing young bulls in limited service across many herds to evaluate daughters, with only 1 in 10 bulls graduating. For beef, ABS uses 8 criteria including EPDs and ultrasound data to select bulls with varied growth and maternal traits suited to different operations.
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Editor's Notes
- Let’s go to page 13-1 and see how ABS selects its dairy bulls.
- Today information from the world can be used to evaluate a sire's offspring, allowing for even more accuracy.
- Once selected and semen is collected, the bull is sampled.
- Here’s some of the criteria looked at when considering a potential bull mother.
- Once the calf is born, he has a lot of tests to pass before he gets to ABS to be sampled.
- Predicted transmitting ability can be estimated using the sire and dam’s information with low accuracy. Progeny information is the most reliable indicator of the bulls ability to transmit.
- ABS began progeny testing in 1963, it is designed to measure genetic differences rather than environmental differences. Thousands of cows in the 4300 herds test these bulls.
- The emphasis is on identification and records.
- Financial rewards can be substantial in well managed herds.
- Only 1 in 10 will make it. That is 1 of 10 out of the elite cows and bulls of the breed.
- Traits that bulls need to excel in.
- To select our beef bulls this criteria is used.
- Comparisons between bulls is done by using the same information available to you EPD’s, GTS and of course phenotype.
- Dairy bulls are designed, sampled and data compiled by USDA for all breeds. Beef sires are selected from the top genetics available based on breed association data.