Sheep for prime lamb production

Question

BlackTom AI · Accepted Answer

Prime lamb production prioritizes meat traits—rapid growth, good carcass conformation and adequate maternal ability—so breeds are chosen to maximize those characteristics.

1. Relevant knowledge points and concepts
- Prime lamb systems focus on meat, not wool, so sheep with good growth rate, carcass conformation and maternal traits are preferred.
- British longwool and medium-wool breeds (e.g., Border Leicester, Dorset, Suffolk, Hampshire) are commonly used as maternal or sire breeds in prime-lamb systems.
- Crossbreeding (maternal × terminal sire) combines prolificacy and mothering from one line with carcass and growth traits from another, optimizing lamb performance.

2. Step-by-step reasoning
- Identify production goal: meat (prime lambs) rather than wool or fibre.
- Select maternal ewes with good fecundity and milk (British breeds like Border Leicester and Dorset are often used or form part of first-cross ewes).
- Use terminal sires (often British or Continental meat breeds) to produce lambs with desirable carcasses and growth.
- Implement crossbreeding to combine the best traits: e.g., a Border Leicester or Dorset ewe crossed with a Suffolk or Texel sire produces prime lambs with superior meat traits.

3. Intermediate considerations (examples)
- Border Leicester: good mothering, size and milk—useful as a maternal breed or for first-cross ewes.
- Dorset: fertility and ability to lamb out of season—valuable in prime lamb systems.
- Crosses: first-cross ewes (e.g., Border Leicester × Merino) then mated to terminal sires produce efficient prime lambs.

4. Why the correct answer is correct
- The option “Are mainly British breeds (such as Border Leicester and Dorset) and cross-breeds” correctly reflects that prime-lamb enterprises rely on British and cross-bred sheep selected for meat production, not fine wool or unrelated species.

5. Why other options are incorrect
- “Have extremely fine wool”: describes Merino-type wool production, not prime-lamb meat production.
- “Are mainly Australian Merino”: Merinos are primarily wool sheep and are not the main meat-producing prime-lamb breed.
- “Are mainly the Brahman breed”: Brahman is a cattle breed, irrelevant to sheep production.

6. Conclusion
The best choice is “Are mainly British breeds (such as Border Leicester and Dorset) and cross-breeds,” which matches the provided correct answer.

Sheep for prime lamb production单项选择题

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