Which of the following EBVs is particularly important to selecting a bull for Farm 1?

Question

BlackTom AI · Accepted Answer

Question restatement: Which of the following EBVs is particularly important to selecting a bull for Farm 1?
Options:
- intramuscular fat
- 200 day weight
- calving ease (direct)
- calving ease (daughters)
- 400 day weight
- export maternal sire index

Option 1: intramuscular fat. This EBV relates to marbling and meat quality traits in progeny. While important for carcass characteristics, it is not the primary driver for bull selection when the immediate concern is ease of calving and herd management at Farm 1. It may influence marketability but does not address birth or calving difficulty directly.

Option 2: 200 day weight. This EBV captures early growth performance. Although growth traits can influence management and nutrition planning, it does not directly address calving ease or the ease with which calves are born, which is often a critical factor for first-calving or heifer-bred herds.

Option 3: calving ease (direct). This EBV estimates how easily a bull’s own calves are born, reflecting the inherent ease with which the sire transmits calving traits to offspring. For a farm prioritizing smooth calving and minimizing dystocia, selecting bulls with favorable direct calving ease is especially important, making this option highly relevant to Farm 1's goal.

Option 4: calving ease (daughters). This EBV predicts how easily the bull’s daughters’ calves are born. While valuable when assessing maternal calving ease and the expected performance of daughters as dams, the immediate impact on the next generation’s calving ease is indirect compared to the bull’s direct calving ease, which more directly influences birth outcomes in their calves.

Option 5: 400 day weight. Similar to 200 day weight, this trait reflects growth performance but does not specifically address calving difficulty. It may influence feed planning and market timing but is not the primary driver for calving-related objectives.

Option 6: export maternal sire index. This index relates to maternal genetics and breeding value for exporting semen or maternal traits across populations. While maternal effects are important for herd productivity, it is a broader industry-oriented metric and less directly tied to the immediate calving ease considerations for selecting a bull for Farm 1.

In sum, among the listed EBVs, calving ease (direct) stands out as the most directly relevant to reducing calving difficulties and ensuring smooth calving when selecting a bull for Farm 1, compared to growth, carcass, maternal, or market-oriented indices. The remaining options address other valuable traits but do not target the direct calving ease outcome as strongly.

AGRI10049_2025_SM2 Beef Breeding Workshop - Quiz 4

Which of the following EBVs is particularly important to selecting a bull for Farm 1?

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