Enhancing embryo numbers for transplantation The success of embryo transfer depends on obtaining many embryos from elite animals. Which intervention is specifically used to achieve this?

Introduction / Context:
Embryo transfer programs rely on superovulation to collect multiple embryos per cycle from genetically superior donors. The hormonal choice and regimen directly influence embryo yield and quality.

Given Data / Assumptions:

• Goal is increased ovulation rate in the donor female.
• Veterinary reproductive management and synchronization are available.

Concept / Approach:
FSH is the standard pituitary-derived (or recombinant) hormone administered in decreasing doses over several days to recruit and mature multiple follicles, markedly increasing ovulation numbers relative to natural cycles.

Step-by-Step Solution:

Verification / Alternative check:
Controlled studies show FSH regimens yield more transferable embryos than reliance on endogenous hormones alone.

Why Other Options Are Wrong:

• Exogenous gonadotrophins (generic) are conceptually correct, but the specific, widely used agent is FSH; option (d) names it precisely.
• Endogenous pulses: insufficient for superovulatory responses.
• “Both without timing control”: timing is essential; lack of control reduces success.
• Diet alone cannot induce superovulation.

Common Pitfalls:
Incorrect dosing schedules, poor synchronization, and ignoring donor variability (breed, parity) can lower embryo yields.

Final Answer:
FSH (Follicle Stimulating Hormone) for superovulation protocols