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Superovulation and egg transfer in the ewe.

S Torrès, Y Cognié

Reproduction, Nutrition, Developpement

|January 1, 1984

Summary

Porcine pituitary extract (pFSH) batch influenced superovulation in ewes. A different pFSH batch significantly increased corpora lutea and viable embryo yield compared to another batch.

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Area of Science:

Reproductive biology and endocrinology in livestock.
Embryo technologies and assisted reproductive techniques in sheep.

Background:

Superovulation protocols are crucial for maximizing prolificacy in donor ewes.
The efficacy of different batches of porcine pituitary extract (pFSH) in sheep superovulation requires investigation.

Purpose of the Study:

To evaluate the impact of different porcine pituitary extract (pFSH) batches on superovulation and embryo recovery in donor ewes.
To compare the effectiveness of two pFSH batches and varying administration protocols on estrus response, corpora lutea count, and viable embryo yield.

Main Methods:

102 donor ewes were synchronized using vaginal sponges containing fluorogestone acetate (FGA).
Follicular maturation was induced using 12 mg of pFSH, with different batches (pFSH1, pFSH2) and administration protocols (4 injections vs. decreasing doses) tested.
Embryos were surgically recovered on Day 6, stored briefly, and transferred to recipient ewes treated with pregnant mare serum gonadotropin (PMSG).

Main Results:

pFSH1 induced estrus in 100% of ewes, while pFSH2 resulted in a 62.5% estrus response.
pFSH2 yielded significantly more corpora lutea (8.1/ewe) and viable embryos (6.1/ewe) compared to pFSH1 (4.6 corpora lutea, 2.7 embryos/ewe).
Embryo recovery rates relative to corpora lutea were 59% (pFSH1), 69% (pFSH2, 4 injections), and 80% (pFSH2, decreasing doses).

Conclusions:

The batch of porcine pituitary extract (pFSH) significantly impacts superovulation efficiency and viable embryo production in sheep.
A specific pFSH batch (pFSH2) and a decreasing dose administration protocol resulted in superior reproductive outcomes.
Optimizing pFSH batch selection and administration is key for enhancing embryo recovery in sheep.

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