Question:
Which of the genetic improvement path provides the highest gain?
Which of the genetic improvement path provides the highest gain?
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The Sire-to-Bull (SB) pathway delivers the highest genetic gain because it combines high selection accuracy from progeny testing with the highest selection intensity in the breeding program.
Updated On: Aug 5, 2026
- Sire to breed cow
- Dam to breed bull
- Sire to breed bull
- Dam to breed cow
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
In a closed, structured dairy cattle breeding population, genetic improvement is transmitted through four distinct pathways of selection:
Sires of Bulls (SB): Sires selected to breed the next generation of team bulls.
Sires of Cows (SC): Sires selected to breed replacement cows in the herd.
Dams of Bulls (DB): Superior cows selected to produce young bulls for testing.
Dams of Cows (DC): Cows selected to produce replacement heifers for the herd.
Step 2: Detailed Explanation:
The total genetic gain in a population is the sum of the gains achieved through each of these four selection pathways.
The contribution of each pathway depends on its selection intensity and accuracy.
Among these, the Sire-to-Breed-Bull (SB) pathway typically contributes the largest portion of the total genetic gain (often accounting for \(40\%\) to \(45\%\) of the total progress).
This high contribution is due to the extreme selection intensity applied to this pathway.
Only a very small number of elite, highly proven sires are selected from the entire population to produce the next generation of breeding bulls.
In contrast, the selection intensity on the dam pathways is limited by the lower reproductive rate of females, as most cows must be kept simply to maintain herd size.
The Sire-to-Breed-Cow (SC) pathway contributes the next highest portion, while the Dam-to-Breed-Cow (DC) pathway contributes the least.
Therefore, the Sire-to-Breed-Bull pathway is the primary driver of genetic improvement in structured dairy breeding programs.
Step 3: Final Answer:
Consequently, the Sire to breed bull pathway provides the highest genetic gain.
In a closed, structured dairy cattle breeding population, genetic improvement is transmitted through four distinct pathways of selection:
Sires of Bulls (SB): Sires selected to breed the next generation of team bulls.
Sires of Cows (SC): Sires selected to breed replacement cows in the herd.
Dams of Bulls (DB): Superior cows selected to produce young bulls for testing.
Dams of Cows (DC): Cows selected to produce replacement heifers for the herd.
Step 2: Detailed Explanation:
The total genetic gain in a population is the sum of the gains achieved through each of these four selection pathways.
The contribution of each pathway depends on its selection intensity and accuracy.
Among these, the Sire-to-Breed-Bull (SB) pathway typically contributes the largest portion of the total genetic gain (often accounting for \(40\%\) to \(45\%\) of the total progress).
This high contribution is due to the extreme selection intensity applied to this pathway.
Only a very small number of elite, highly proven sires are selected from the entire population to produce the next generation of breeding bulls.
In contrast, the selection intensity on the dam pathways is limited by the lower reproductive rate of females, as most cows must be kept simply to maintain herd size.
The Sire-to-Breed-Cow (SC) pathway contributes the next highest portion, while the Dam-to-Breed-Cow (DC) pathway contributes the least.
Therefore, the Sire-to-Breed-Bull pathway is the primary driver of genetic improvement in structured dairy breeding programs.
Step 3: Final Answer:
Consequently, the Sire to breed bull pathway provides the highest genetic gain.
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